diff options
| author | Sean Rhodes <sean@starlabs.systems> | 2022-07-18 11:31:00 +0100 |
|---|---|---|
| committer | Martin L Roth <gaumless@gmail.com> | 2022-10-22 17:11:25 +0000 |
| commit | 7bbc9a512aa1e19b8cb172fa3ad1cea5743bd3f3 (patch) | |
| tree | 86bededa1834752310365ad597d9c42727eea505 /payloads/external/edk2 | |
| parent | 27c8bf0cc936beb3d7b7012fa6d683ec74ed940f (diff) | |
payloads/edk2: Disable the CPU Timer Lib unless supported
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>
Diffstat (limited to 'payloads/external/edk2')
| -rw-r--r-- | payloads/external/edk2/Kconfig | 14 | ||||
| -rw-r--r-- | payloads/external/edk2/Makefile | 6 |
2 files changed, 20 insertions, 0 deletions
diff --git a/payloads/external/edk2/Kconfig b/payloads/external/edk2/Kconfig index e0c19bbd0b..454aef0069 100644 --- a/payloads/external/edk2/Kconfig +++ b/payloads/external/edk2/Kconfig @@ -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 diff --git a/payloads/external/edk2/Makefile b/payloads/external/edk2/Makefile index e1a0c93ddc..ff1dfbc03f 100644 --- a/payloads/external/edk2/Makefile +++ b/payloads/external/edk2/Makefile @@ -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 |