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payloads/edk2: Disable the CPU Timer Lib unless supported

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For recent X86 CPUs, the 0x15 CPUID instruction will return Time Stamp
Counter Frequence. For CPUs that do not support this instruction, EDK2
must include a different library which is the reason why this must be
configured at build time.

If this is enabled, and the CPU doesn't support 0x15, it will fail to
boot. If is not enabled, and the CPU does support 0x15, it will still
boot but without support for the leaf. Consequently, disabled it by
default.

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I4f0f43ce50c4f6f7eb03063fff34d015468f6daa
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65950
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
This commit is contained in:
Sean Rhodes
2022-07-18 11:31:00 +01:00
committed by Martin L Roth
parent 27c8bf0cc9
commit 7bbc9a512a
13 changed files with 34 additions and 0 deletions
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14
payloads/external/edk2/Kconfig vendored
View File

@@ -155,6 +155,20 @@ config EDK2_CBMEM_LOGGING
this option, especially if using a debug (vs release) build.
Selecting this option will increase the payload size in CBFS by 0x10000.
config EDK2_CPU_TIMER_LIB
bool
default n
help
For recent Intel and AMD CPUs, the 0x15 CPUID instruction will return Time
Stamp Counter Frequence. For CPUs that do not support this instruction,
EDK2 must include a different library which is the reason why this must be
configured at build time.
If this is enabled, and the CPU doesn't support 0x15, it will fail to
boot. If it is not enabled, and the CPU does support 0x15, it will still
boot but without support for the leaf. Consequently, it is disabled by
default.
config EDK2_FOLLOW_BGRT_SPEC
bool "Center logo 38.2% from the top of screen"
default n

6
payloads/external/edk2/Makefile vendored
View File

@@ -44,6 +44,12 @@ RELEASE_STR = DEBUG
else
RELEASE_STR = RELEASE
endif
# CPU_TIMER_LIB_ENABLE = TRUE
ifneq ($(CONFIG_EDK2_CPU_TIMER_LIB),y)
BUILD_STR += -D CPU_TIMER_LIB_ENABLE=FALSE
else
BUILD_STR += --pcd gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency=$(CONFIG_CPU_XTAL_HZ)
endif
# DISABLE_SERIAL_TERMINAL = FALSE
ifneq ($(CONFIG_EDK2_SERIAL_SUPPORT),y)
BUILD_STR += -D DISABLE_SERIAL_TERMINAL=TRUE