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x86: timer: use a timer base of 0

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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>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2019-12-06 21:41:49 -07:00
committed by Bin Meng
parent dd0edcb250
commit 77dd7c6854
5 changed files with 19 additions and 1 deletions
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lib/efi/Kconfig
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@@ -1,6 +1,7 @@
config EFI
bool "Support running U-Boot from EFI"
depends on X86
imply X86_TSC_READ_BASE
help
U-Boot can be started from EFI on certain platforms. This allows
EFI to perform most of the system init and then jump to U-Boot for