d91f3a4eaf
The decompression is critical for speed of boot. So we sacrifice some
generated code size to optimize for speed.
This change speeds up the LZMA decompression between 3% and 6% at a
cost of just over 2k of additional code space.
BUG=b:223985641
TEST=Majolica
The test is done on Majolica and the result is listed below.
Time saved:
We tested the boot time with each flag for 10 times. The duration of
each decompression process is listed as below.
Load FSP-M Load ramstage Load payload
Ofast Os Ofast Os Ofast Os
------------------------------------------
62543 62959 20585 22458 9945 10626
62548 62967 20587 22461 9951 10637
62560 62980 20588 22478 9951 10641
62561 62988 20596 22478 9954 10643
62569 62993 20596 22479 9954 10643
62574 63000 20605 22492 9958 10647
62575 63026 20615 22495 9959 10647
62576 63038 20743 22614 9960 10647
62587 63044 20758 22625 9961 10647
62592 63045 20769 22637 9961 10647
-----------------------------------------
average 62568 63004 20644 22521 9955 10642
(unit: microseconds)
Size sacrificed:
The size of object file with -Os:
./build/ramstage/lib/lzmadecode.o: file format elf32-i386
4 .text.LzmaDecode 00000d84 00000000 00000000 00000076 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
The size of object file with -Ofast:
./build/ramstage/lib/lzmadecode.o: file format elf32-i386
4 .text.LzmaDecode 00001719 00000000 00000000 00000080 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
(Output by running "objdump -h ./build/ramstage/lib/lzmadecode.o")
We can see that size is increased from 3460 bytes to 5913 bytes, a
change of 2453 bytes or 171%.
Change-Id: Ie003164e2e93ba8ed3ccd207f3af31c6acf1c5e2
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66392
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
123 lines
3 KiB
Text
123 lines
3 KiB
Text
config MISSING_BOARD_RESET
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bool
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help
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Selected by boards that don't provide a do_board_reset()
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implementation. This activates a stub that logs the missing
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board reset and halts execution.
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config RAMSTAGE_ADA
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bool
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help
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Selected by features that use Ada code in ramstage.
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config RAMSTAGE_LIBHWBASE
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bool
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select RAMSTAGE_ADA
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help
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Selected by features that require `libhwbase` in ramstage.
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config FLATTENED_DEVICE_TREE
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bool
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help
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Selected by features that require to parse and manipulate a flattened
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devicetree in ramstage.
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config HAVE_SPD_IN_CBFS
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bool
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help
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If enabled, add support for adding spd.hex files in cbfs as spd.bin
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and locating it runtime to load SPD.
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config DIMM_MAX
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int
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default 4
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help
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Total number of memory DIMM slots available on motherboard.
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It is multiplication of number of channel to number of DIMMs per
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channel
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config DIMM_SPD_SIZE
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int
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default 256
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help
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Total SPD size that will be used for DIMM.
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Ex: DDR3 256, DDR4 512.
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config SPD_READ_BY_WORD
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bool
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config SPD_CACHE_IN_FMAP
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bool
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default n
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help
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Enables capability to cache DIMM SPDs in a dedicated FMAP region
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to speed loading of SPD data. Currently requires board-level
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romstage implementation to read/write/utilize cached SPD data.
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When the default FMAP is used, will create a region named RW_SPD_CACHE
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to store the cached SPD data.
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config SPD_CACHE_FMAP_NAME
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string
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depends on SPD_CACHE_IN_FMAP
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default "RW_SPD_CACHE"
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help
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Name of the FMAP region created in the default FMAP to cache SPD data.
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if RAMSTAGE_LIBHWBASE
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config HWBASE_DYNAMIC_MMIO
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def_bool y
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config HWBASE_DEFAULT_MMCONF
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hex
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default ECAM_MMCONF_BASE_ADDRESS
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config HWBASE_DIRECT_PCIDEV
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def_bool y
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endif
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config NO_FMAP_CACHE
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bool
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help
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If your platform really doesn't want to use an FMAP cache (e.g. due to
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space constraints), you can select this to disable warnings and save
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a bit more code.
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config ESPI_DEBUG
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bool
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help
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This option enables eSPI library helper functions for displaying debug
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information.
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config NO_CBFS_MCACHE
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bool
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help
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Disables the CBFS metadata cache. This means that your platform does
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not need to provide a CBFS_MCACHE section in memlayout and can save
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the associated CAR/SRAM size. In that case every single CBFS file
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lookup must re-read the same CBFS directory entries from flash to find
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the respective file.
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config CBFS_CACHE_ALIGN
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int
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default 8
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help
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Sets the alignment of the buffers returned by the cbfs_cache.
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config CBFS_PRELOAD
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bool
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depends on COOP_MULTITASKING
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help
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When enabled it will be possible to preload CBFS files into the
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cbfs_cache. This helps reduce boot time by loading the files
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in the background before they are actually required. This feature
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depends on the read-only boot_device having a DMA controller to
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perform the background transfer.
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config DECOMPRESS_OFAST
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bool
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depends on COMPILER_GCC
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default y
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help
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Compile the decompressing function in -Ofast instead of standard -Os
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