On Mon, Nov 25, 2019 at 12:11 PM Simon Glass sjg@chromium.org wrote:
On x86 platforms the timer is reset to 0 when the SoC is reset. Having this as the timer base is useful since it provides an indication of how long it takes before U-Boot is running.
When U-Boot sets the timer base to something else, time is lost and we no-longer have an accurate account of the time since reset. This particularly affects bootstage.
Change the default to not read the timer base, leaving it at 0. Add an option for when U-Boot is the secondary bootloader.
Signed-off-by: Simon Glass sjg@chromium.org
Changes in v5: None Changes in v4:
- Enable option for slimbootloader, coreboot, efi
- Reverse the sense of the CONFIG option
Changes in v3: None Changes in v2: None
arch/x86/cpu/coreboot/Kconfig | 1 + arch/x86/cpu/slimbootloader/Kconfig | 1 + drivers/timer/Kconfig | 14 ++++++++++++++ drivers/timer/tsc_timer.c | 3 ++- lib/efi/Kconfig | 1 + 5 files changed, 19 insertions(+), 1 deletion(-)
Reviewed-by: Bin Meng bmeng.cn@gmail.com