99f83bbad4
As discussed on the mailing list and voted upon, the coreboot project is going to move the majority of copyrights out of the headers and into an AUTHORS file. This will happen a bit at a time, as we'll be unifying license headers at the same time. Additional cleanup - Unify "Inc" to "Inc." and "LLC." to "LLC" Signed-off-by: Martin Roth <martin@coreboot.org> Change-Id: Ie03a3ce1f6085494bd5f38da76e2467970cf301a Reviewed-on: https://review.coreboot.org/c/coreboot/+/35430 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
685 lines
19 KiB
Text
685 lines
19 KiB
Text
##
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## This file is part of the coreboot project.
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##
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; version 2 of the License.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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menu "Devices"
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config HAVE_VGA_TEXT_FRAMEBUFFER
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bool
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help
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Selected by graphics drivers that support legacy VGA text mode.
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config HAVE_VBE_LINEAR_FRAMEBUFFER
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bool
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help
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Selected by graphics drivers that can set up a VBE linear-framebuffer
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mode.
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config HAVE_LINEAR_FRAMEBUFFER
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bool
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help
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Selected by graphics drivers that can set up a generic linear
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framebuffer.
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config HAVE_FSP_GOP
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bool
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help
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Selected by drivers that support to run a blob that implements
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the Graphics Output Protocol (GOP).
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config MAINBOARD_HAS_NATIVE_VGA_INIT
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def_bool n
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help
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Selected by mainboards / drivers that provide native graphics
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init within coreboot.
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config MAINBOARD_FORCE_NATIVE_VGA_INIT
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def_bool n
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depends on MAINBOARD_HAS_NATIVE_VGA_INIT || MAINBOARD_HAS_LIBGFXINIT
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help
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Selected by mainboards / chipsets whose graphics driver can't or
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shouldn't be disabled.
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config MAINBOARD_HAS_LIBGFXINIT
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def_bool n
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help
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Selected by mainboards that implement support for `libgfxinit`.
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Usually this requires a list of ports to be probed for displays.
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choice
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prompt "Graphics initialization"
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default NO_GFX_INIT if VGA_BIOS && PAYLOAD_SEABIOS
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default VGA_ROM_RUN if VGA_BIOS
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config MAINBOARD_DO_NATIVE_VGA_INIT
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bool "Use native graphics init"
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depends on MAINBOARD_HAS_NATIVE_VGA_INIT
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help
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Some mainboards, such as the Google Link, allow initializing the
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display without the need of a binary only VGA OPROM. Enabling this
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option may be faster, but also lacks flexibility in setting modes.
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config MAINBOARD_USE_LIBGFXINIT
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bool "Use libgfxinit"
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depends on MAINBOARD_HAS_LIBGFXINIT
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select HAVE_VGA_TEXT_FRAMEBUFFER
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select HAVE_LINEAR_FRAMEBUFFER
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select VGA if VGA_TEXT_FRAMEBUFFER
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help
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Use the SPARK library `libgfxinit` for the native graphics
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initialization. This requires an Ada toolchain.
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# TODO: Explain differences (if any) for onboard cards.
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config VGA_ROM_RUN
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bool "Run VGA Option ROMs"
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depends on PCI && (ARCH_X86 || ARCH_PPC64) && !MAINBOARD_FORCE_NATIVE_VGA_INIT
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select HAVE_VGA_TEXT_FRAMEBUFFER
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help
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Execute VGA Option ROMs in coreboot if found. This can be used
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to enable PCI/AGP/PCI-E video cards when not using a SeaBIOS
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payload.
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When using a SeaBIOS payload it runs all option ROMs with much
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more complete BIOS interrupt services available than coreboot,
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which some option ROMs require in order to function correctly.
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config RUN_FSP_GOP
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bool "Run a GOP driver"
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depends on HAVE_FSP_GOP
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select HAVE_LINEAR_FRAMEBUFFER
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help
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Some platforms (e.g. Intel Braswell and Skylake/Kaby Lake) support
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to run a GOP blob. This option enables graphics initialization with
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such a blob.
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config NO_GFX_INIT
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bool "None"
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depends on !MAINBOARD_FORCE_NATIVE_VGA_INIT
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help
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Select this to not perform any graphics initialization in
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coreboot. This is useful if the payload (e.g. SeaBIOS) can
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initialize graphics or if pre-boot graphics are not required.
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endchoice
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config S3_VGA_ROM_RUN
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bool "Re-run VGA Option ROMs on S3 resume"
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default y
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depends on VGA_ROM_RUN && HAVE_ACPI_RESUME
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help
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Execute VGA Option ROMs in coreboot when resuming from S3 suspend.
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When using a SeaBIOS payload it runs all option ROMs with much
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more complete BIOS interrupt services available than coreboot,
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which some option ROMs require in order to function correctly.
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If unsure, say N when using SeaBIOS as payload, Y otherwise.
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config ALWAYS_LOAD_OPROM
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def_bool n
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depends on VGA_ROM_RUN
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help
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Always load option ROMs if any are found. The decision to run
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the ROM is still determined at runtime, but the distinction
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between loading and not running comes into play for CHROMEOS.
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An example where this is required is that VBT (Video BIOS Tables)
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are needed for the kernel's display driver to know how a piece of
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hardware is configured to be used.
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config ALWAYS_RUN_OPROM
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def_bool n
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depends on VGA_ROM_RUN && ALWAYS_LOAD_OPROM
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help
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Always uncondtionally run the option regardless of other
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policies.
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config ON_DEVICE_ROM_LOAD
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bool "Load Option ROMs on PCI devices"
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default n if PAYLOAD_SEABIOS
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default y if !PAYLOAD_SEABIOS
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depends on VGA_ROM_RUN
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help
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Load Option ROMs stored on PCI/PCIe/AGP VGA devices in coreboot.
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If disabled, only Option ROMs stored in CBFS will be executed by
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coreboot. If you are concerned about security, you might want to
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disable this option, but it might leave your system in a state of
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degraded functionality.
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When using a SeaBIOS payload it runs all option ROMs with much
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more complete BIOS interrupt services available than coreboot,
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which some option ROMs require in order to function correctly.
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If unsure, say N when using SeaBIOS as payload, Y otherwise.
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choice
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prompt "Option ROM execution type"
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default PCI_OPTION_ROM_RUN_YABEL if !ARCH_X86
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default PCI_OPTION_ROM_RUN_REALMODE if ARCH_X86
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depends on VGA_ROM_RUN
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config PCI_OPTION_ROM_RUN_REALMODE
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prompt "Native mode"
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bool
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depends on ARCH_X86
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help
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If you select this option, PCI Option ROMs will be executed
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natively on the CPU in real mode. No CPU emulation is involved,
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so this is the fastest, but also the least secure option.
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(only works on x86/x64 systems)
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config PCI_OPTION_ROM_RUN_YABEL
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prompt "Secure mode"
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bool
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help
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If you select this option, the x86emu CPU emulator will be used to
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execute PCI Option ROMs.
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This option prevents Option ROMs from doing dirty tricks with the
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system (such as installing SMM modules or hypervisors), but it is
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also significantly slower than the native Option ROM initialization
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method.
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This is the default choice for non-x86 systems.
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endchoice
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config YABEL_PCI_ACCESS_OTHER_DEVICES
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prompt "Allow Option ROMs to access other devices"
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bool
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depends on PCI_OPTION_ROM_RUN_YABEL
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help
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Per default, YABEL only allows Option ROMs to access the PCI device
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that they are associated with. However, this causes trouble for some
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onboard graphics chips whose Option ROM needs to reconfigure the
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north bridge.
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config YABEL_PCI_FAKE_WRITING_OTHER_DEVICES_CONFIG
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prompt "Fake success on writing other device's config space"
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bool
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depends on YABEL_PCI_ACCESS_OTHER_DEVICES
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help
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By default, YABEL aborts when the Option ROM tries to write to other
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devices' config spaces. With this option enabled, the write doesn't
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follow through, but the Option ROM is allowed to go on.
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This can create issues such as hanging Option ROMs (if it depends on
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that other register changing to the written value), so test for
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impact before using this option.
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config YABEL_VIRTMEM_LOCATION
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prompt "Location of YABEL's virtual memory"
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hex
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depends on PCI_OPTION_ROM_RUN_YABEL
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default 0x1000000
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help
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YABEL requires 1MB memory for its CPU emulation. This memory is
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normally located at 16MB.
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config YABEL_DIRECTHW
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prompt "Direct hardware access"
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bool
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depends on PCI_OPTION_ROM_RUN_YABEL && ARCH_X86
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help
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YABEL consists of two parts: It uses x86emu for the CPU emulation and
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additionally provides a PC system emulation that filters bad device
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and memory access (such as PCI config space access to other devices
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than the initialized one).
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When choosing this option, x86emu will pass through all hardware
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accesses to memory and I/O devices to the underlying memory and I/O
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addresses. While this option prevents Option ROMs from doing dirty
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tricks with the CPU (such as installing SMM modules or hypervisors),
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they can still access all devices in the system.
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Enable this option for a good compromise between security and speed.
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config MULTIPLE_VGA_ADAPTERS
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bool
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default n
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menu "Display"
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depends on HAVE_VGA_TEXT_FRAMEBUFFER || HAVE_LINEAR_FRAMEBUFFER
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config FRAMEBUFFER_SET_VESA_MODE
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prompt "Set framebuffer graphics resolution"
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bool
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default y if CHROMEOS
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depends on PCI_OPTION_ROM_RUN_YABEL || PCI_OPTION_ROM_RUN_REALMODE
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select HAVE_VBE_LINEAR_FRAMEBUFFER
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help
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Set VESA/native framebuffer mode (needed for bootsplash and graphical framebuffer console)
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if FRAMEBUFFER_SET_VESA_MODE
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choice
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prompt "framebuffer graphics resolution"
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default FRAMEBUFFER_VESA_MODE_118
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help
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This option sets the resolution used for the coreboot framebuffer (and
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bootsplash screen).
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config FRAMEBUFFER_VESA_MODE_100
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bool "640x400 256-color"
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config FRAMEBUFFER_VESA_MODE_101
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bool "640x480 256-color"
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config FRAMEBUFFER_VESA_MODE_102
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bool "800x600 16-color"
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config FRAMEBUFFER_VESA_MODE_103
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bool "800x600 256-color"
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config FRAMEBUFFER_VESA_MODE_104
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bool "1024x768 16-color"
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config FRAMEBUFFER_VESA_MODE_105
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bool "1024x768 256-color"
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config FRAMEBUFFER_VESA_MODE_106
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bool "1280x1024 16-color"
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config FRAMEBUFFER_VESA_MODE_107
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bool "1280x1024 256-color"
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config FRAMEBUFFER_VESA_MODE_108
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bool "80x60 text"
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config FRAMEBUFFER_VESA_MODE_109
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bool "132x25 text"
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config FRAMEBUFFER_VESA_MODE_10A
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bool "132x43 text"
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config FRAMEBUFFER_VESA_MODE_10B
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bool "132x50 text"
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config FRAMEBUFFER_VESA_MODE_10C
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bool "132x60 text"
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config FRAMEBUFFER_VESA_MODE_10D
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bool "320x200 32k-color (1:5:5:5)"
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config FRAMEBUFFER_VESA_MODE_10E
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bool "320x200 64k-color (5:6:5)"
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config FRAMEBUFFER_VESA_MODE_10F
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bool "320x200 16.8M-color (8:8:8)"
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config FRAMEBUFFER_VESA_MODE_110
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bool "640x480 32k-color (1:5:5:5)"
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config FRAMEBUFFER_VESA_MODE_111
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bool "640x480 64k-color (5:6:5)"
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config FRAMEBUFFER_VESA_MODE_112
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bool "640x480 16.8M-color (8:8:8)"
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config FRAMEBUFFER_VESA_MODE_113
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bool "800x600 32k-color (1:5:5:5)"
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config FRAMEBUFFER_VESA_MODE_114
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bool "800x600 64k-color (5:6:5)"
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config FRAMEBUFFER_VESA_MODE_115
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bool "800x600 16.8M-color (8:8:8)"
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config FRAMEBUFFER_VESA_MODE_116
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bool "1024x768 32k-color (1:5:5:5)"
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config FRAMEBUFFER_VESA_MODE_117
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bool "1024x768 64k-color (5:6:5)"
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config FRAMEBUFFER_VESA_MODE_118
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bool "1024x768 16.8M-color (8:8:8)"
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config FRAMEBUFFER_VESA_MODE_119
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bool "1280x1024 32k-color (1:5:5:5)"
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config FRAMEBUFFER_VESA_MODE_11A
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bool "1280x1024 64k-color (5:6:5)"
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config FRAMEBUFFER_VESA_MODE_11B
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bool "1280x1024 16.8M-color (8:8:8)"
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config FRAMEBUFFER_VESA_MODE_USER
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bool "Manually select VESA mode"
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endchoice
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# Map the config names to an integer (KB).
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config FRAMEBUFFER_VESA_MODE
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prompt "VESA mode" if FRAMEBUFFER_VESA_MODE_USER
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hex
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default 0x100 if FRAMEBUFFER_VESA_MODE_100
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default 0x101 if FRAMEBUFFER_VESA_MODE_101
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default 0x102 if FRAMEBUFFER_VESA_MODE_102
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default 0x103 if FRAMEBUFFER_VESA_MODE_103
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default 0x104 if FRAMEBUFFER_VESA_MODE_104
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default 0x105 if FRAMEBUFFER_VESA_MODE_105
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default 0x106 if FRAMEBUFFER_VESA_MODE_106
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default 0x107 if FRAMEBUFFER_VESA_MODE_107
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default 0x108 if FRAMEBUFFER_VESA_MODE_108
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default 0x109 if FRAMEBUFFER_VESA_MODE_109
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default 0x10A if FRAMEBUFFER_VESA_MODE_10A
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default 0x10B if FRAMEBUFFER_VESA_MODE_10B
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default 0x10C if FRAMEBUFFER_VESA_MODE_10C
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default 0x10D if FRAMEBUFFER_VESA_MODE_10D
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default 0x10E if FRAMEBUFFER_VESA_MODE_10E
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default 0x10F if FRAMEBUFFER_VESA_MODE_10F
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default 0x110 if FRAMEBUFFER_VESA_MODE_110
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default 0x111 if FRAMEBUFFER_VESA_MODE_111
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default 0x112 if FRAMEBUFFER_VESA_MODE_112
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default 0x113 if FRAMEBUFFER_VESA_MODE_113
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default 0x114 if FRAMEBUFFER_VESA_MODE_114
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default 0x115 if FRAMEBUFFER_VESA_MODE_115
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default 0x116 if FRAMEBUFFER_VESA_MODE_116
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default 0x117 if FRAMEBUFFER_VESA_MODE_117
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default 0x118 if FRAMEBUFFER_VESA_MODE_118
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default 0x119 if FRAMEBUFFER_VESA_MODE_119
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default 0x11A if FRAMEBUFFER_VESA_MODE_11A
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default 0x11B if FRAMEBUFFER_VESA_MODE_11B
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default 0x118 if FRAMEBUFFER_VESA_MODE_USER
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endif # FRAMEBUFFER_SET_VESA_MODE
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choice
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prompt "Framebuffer mode"
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default VBE_LINEAR_FRAMEBUFFER if HAVE_VBE_LINEAR_FRAMEBUFFER && CHROMEOS
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default GENERIC_LINEAR_FRAMEBUFFER if HAVE_LINEAR_FRAMEBUFFER && CHROMEOS
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default VGA_TEXT_FRAMEBUFFER
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config VGA_TEXT_FRAMEBUFFER
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bool "Legacy VGA text mode"
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depends on HAVE_VGA_TEXT_FRAMEBUFFER
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help
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If this option is enabled, coreboot will initialize graphics in
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legacy VGA text mode or, if a VGA BIOS is used and a VESA mode set,
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switch to text mode before handing control to a payload.
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config VBE_LINEAR_FRAMEBUFFER
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bool "VESA framebuffer"
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depends on HAVE_VBE_LINEAR_FRAMEBUFFER
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help
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This option keeps the framebuffer mode set after coreboot finishes
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execution. If this option is enabled, coreboot will pass a
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framebuffer entry in its coreboot table and the payload will need a
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compatible driver.
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config GENERIC_LINEAR_FRAMEBUFFER
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bool "Linear \"high-resolution\" framebuffer"
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depends on HAVE_LINEAR_FRAMEBUFFER
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help
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This option enables a high-resolution, linear framebuffer. If this
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option is enabled, coreboot will pass a framebuffer entry in its
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coreboot table and the payload will need a compatible driver.
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endchoice
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# Workaround to have LINEAR_FRAMEBUFFER set in both cases
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# VBE_LINEAR_FRAMEBUFFER and GENERIC_LINEAR_FRAMEBUFFER.
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# `kconfig_lint` doesn't let us use the same name with
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# different texts in the choice above.
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config LINEAR_FRAMEBUFFER
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def_bool y
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depends on VBE_LINEAR_FRAMEBUFFER || GENERIC_LINEAR_FRAMEBUFFER
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config BOOTSPLASH
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prompt "Show graphical bootsplash"
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bool
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depends on LINEAR_FRAMEBUFFER
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help
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This option shows a graphical bootsplash screen. The graphics are
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loaded from the CBFS file bootsplash.jpg.
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You can either specify the location and file name of the
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image in the 'General' section or add it manually to CBFS, using,
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for example, cbfstool.
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config LINEAR_FRAMEBUFFER_MAX_WIDTH
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int "Maximum width in pixels"
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depends on LINEAR_FRAMEBUFFER && MAINBOARD_USE_LIBGFXINIT
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default 2560
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help
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Set the maximum width of the framebuffer. This may help with
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default fonts too tiny for high-resolution displays.
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config LINEAR_FRAMEBUFFER_MAX_HEIGHT
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int "Maximum height in pixels"
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depends on LINEAR_FRAMEBUFFER && MAINBOARD_USE_LIBGFXINIT
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default 1600
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help
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Set the maximum height of the framebuffer. This may help with
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default fonts too tiny for high-resolution displays.
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endmenu # "Display"
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config SMBUS_HAS_AUX_CHANNELS
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bool
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default n
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config PCI
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bool
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default n
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if PCI
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config NO_MMCONF_SUPPORT
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bool
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default n
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config MMCONF_SUPPORT
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bool
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default !NO_MMCONF_SUPPORT
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config HYPERTRANSPORT_PLUGIN_SUPPORT
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bool
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default n
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config PCIX_PLUGIN_SUPPORT
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bool
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default y
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config CARDBUS_PLUGIN_SUPPORT
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bool
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default y
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config AZALIA_PLUGIN_SUPPORT
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bool
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default n
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config PCIEXP_PLUGIN_SUPPORT
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bool
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default y
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endif # PCI
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if PCIEXP_PLUGIN_SUPPORT
|
|
|
|
config PCIEXP_COMMON_CLOCK
|
|
prompt "Enable PCIe Common Clock"
|
|
bool
|
|
default n
|
|
help
|
|
Detect and enable Common Clock on PCIe links.
|
|
|
|
config PCIEXP_ASPM
|
|
prompt "Enable PCIe ASPM"
|
|
bool
|
|
default n
|
|
help
|
|
Detect and enable ASPM (Active State Power Management) on PCIe links.
|
|
|
|
config PCIEXP_CLK_PM
|
|
prompt "Enable PCIe Clock Power Management"
|
|
bool
|
|
default n
|
|
help
|
|
Detect and enable Clock Power Management on PCIe.
|
|
|
|
config PCIEXP_L1_SUB_STATE
|
|
prompt "Enable PCIe ASPM L1 SubState"
|
|
bool
|
|
depends on (MMCONF_SUPPORT || PCI_IO_CFG_EXT)
|
|
default n
|
|
help
|
|
Detect and enable ASPM on PCIe links.
|
|
|
|
endif # PCIEXP_PLUGIN_SUPPORT
|
|
|
|
config EARLY_PCI_BRIDGE
|
|
bool "Early PCI bridge"
|
|
depends on PCI
|
|
default n
|
|
help
|
|
While coreboot is executing code from ROM, the coreboot resource
|
|
allocator has not been running yet. Hence PCI devices living behind
|
|
a bridge are not yet visible to the system.
|
|
|
|
This option enables static configuration for a single pre-defined
|
|
PCI bridge function on bus 0.
|
|
|
|
if EARLY_PCI_BRIDGE
|
|
|
|
config EARLY_PCI_BRIDGE_DEVICE
|
|
hex "bridge device"
|
|
default 0x0
|
|
|
|
config EARLY_PCI_BRIDGE_FUNCTION
|
|
hex "bridge function"
|
|
default 0x0
|
|
|
|
config EARLY_PCI_MMIO_BASE
|
|
hex "MMIO window base"
|
|
default 0x0
|
|
|
|
endif # EARLY_PCI_BRIDGE
|
|
|
|
config SUBSYSTEM_VENDOR_ID
|
|
hex "Override PCI Subsystem Vendor ID"
|
|
depends on PCI
|
|
default 0x0000
|
|
help
|
|
This config option will override the devicetree settings for
|
|
PCI Subsystem Vendor ID.
|
|
|
|
config SUBSYSTEM_DEVICE_ID
|
|
hex "Override PCI Subsystem Device ID"
|
|
depends on PCI
|
|
default 0x0000
|
|
help
|
|
This config option will override the devicetree settings for
|
|
PCI Subsystem Device ID.
|
|
|
|
config VGA_BIOS
|
|
bool "Add a VGA BIOS image"
|
|
depends on ARCH_X86
|
|
help
|
|
Select this option if you have a VGA BIOS image that you would
|
|
like to add to your ROM.
|
|
|
|
You will be able to specify the location and file name of the
|
|
image later.
|
|
|
|
config VGA_BIOS_FILE
|
|
string "VGA BIOS path and filename"
|
|
depends on VGA_BIOS
|
|
default "vgabios.bin"
|
|
help
|
|
The path and filename of the file to use as VGA BIOS.
|
|
|
|
config VGA_BIOS_ID
|
|
string "VGA device PCI IDs"
|
|
depends on VGA_BIOS
|
|
default "1106,3230"
|
|
help
|
|
The comma-separated PCI vendor and device ID that would associate
|
|
your VGA BIOS to your video card.
|
|
|
|
Example: 1106,3230
|
|
|
|
In the above example 1106 is the PCI vendor ID (in hex, but without
|
|
the "0x" prefix) and 3230 specifies the PCI device ID of the
|
|
video card (also in hex, without "0x" prefix).
|
|
|
|
Under GNU/Linux you can run `lspci -nn` to list the IDs of your PCI devices.
|
|
|
|
config VGA_BIOS_DGPU
|
|
bool "Add a discrete VGA BIOS image"
|
|
depends on VGA_BIOS
|
|
help
|
|
Select this option if you have a VGA BIOS image for discrete GPU
|
|
that you would like to add to your ROM.
|
|
|
|
You will be able to specify the location and file name of the
|
|
image later.
|
|
|
|
config VGA_BIOS_DGPU_FILE
|
|
string "Discrete VGA BIOS path and filename"
|
|
depends on VGA_BIOS_DGPU
|
|
default "vgabios_dgpu.bin"
|
|
help
|
|
The path and filename of the file to use as VGA BIOS for discrete GPU.
|
|
|
|
config VGA_BIOS_DGPU_ID
|
|
string "Discrete VGA device PCI IDs"
|
|
depends on VGA_BIOS_DGPU
|
|
default "1002,6663"
|
|
help
|
|
The comma-separated PCI vendor and device ID that would associate
|
|
your VGA BIOS to your discrete video card.
|
|
|
|
Examples:
|
|
1002,6663 for HD 8570M
|
|
1002,6665 for R5 M230
|
|
|
|
In the above examples 1002 is the PCI vendor ID (in hex, but without
|
|
the "0x" prefix) and 6663 / 6665 specifies the PCI device ID of the
|
|
discrete video card (also in hex, without "0x" prefix).
|
|
|
|
Under GNU/Linux you can run `lspci -nn` to list the IDs of your PCI devices.
|
|
|
|
config INTEL_GMA_HAVE_VBT
|
|
bool
|
|
help
|
|
Select this in the mainboard Kconfig to indicate the board has
|
|
a data.vbt file.
|
|
|
|
config INTEL_GMA_ADD_VBT
|
|
depends on SOC_INTEL_COMMON || CPU_INTEL_COMMON
|
|
bool "Add a Video Bios Table (VBT) binary to CBFS"
|
|
default y if INTEL_GMA_HAVE_VBT
|
|
help
|
|
Add a VBT data file to CBFS. The VBT describes the integrated
|
|
GPU and connections, and is needed by the GOP driver integrated into
|
|
FSP and the OS driver in order to initialize the display.
|
|
|
|
config INTEL_GMA_VBT_FILE
|
|
string "VBT binary path and filename"
|
|
depends on INTEL_GMA_ADD_VBT
|
|
default "src/mainboard/$(MAINBOARDDIR)/variants/$(VARIANT_DIR)/data.vbt" \
|
|
if INTEL_GMA_HAVE_VBT && VARIANT_DIR != ""
|
|
default "src/mainboard/$(MAINBOARDDIR)/data.vbt" if INTEL_GMA_HAVE_VBT
|
|
default "3rdparty/blobs/mainboard/$(MAINBOARDDIR)/vbt.bin"
|
|
help
|
|
The path and filename of the VBT binary.
|
|
|
|
config SOFTWARE_I2C
|
|
bool "Enable I2C controller emulation in software"
|
|
default n
|
|
help
|
|
This config option will enable code to override the i2c_transfer
|
|
routine with a (simple) software emulation of the protocol. This may
|
|
be useful for debugging or on platforms where a driver for the real
|
|
I2C controller is not (yet) available. The platform code needs to
|
|
provide bindings to manually toggle I2C lines.
|
|
|
|
endmenu
|