This change adds support for the generic LPC memory range configuration
in the EC ACPI code.
If CONFIG_EC_GOOGLE_CHROMEEC_LPC_GENERIC_MEMORY_RANGE is enabled, the
EC will use the generic LPC memory range for EMEM related communication
between EC and AP Firmware. This is useful for platforms that do not
have a dedicated IO range like accessed EMEM through port 62/66 or
through LPC at 900h.
The generic LPC memory range is defined by the _SB.PCI0.LPCB.GLGM()
method. This method returns the base address and size of the memory
range.
Update the comment section to reflect the alternative source for EMEM
data when CONFIG_EC_GOOGLE_CHROMEEC_LPC_GENERIC_MEMORY_RANGE is enabled.
BUG=b:354066052
TEST=Build and boot on a device with
CONFIG_EC_GOOGLE_CHROMEEC_LPC_GENERIC_MEMORY_RANGE enabled.
Change-Id: I8038e2827ec7e301bad3a5a58df007f3a448bad7
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85811
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
70b33cb38d