diff options
| author | Duncan Laurie <dlaurie@chromium.org> | 2012-03-16 09:18:55 -0700 |
|---|---|---|
| committer | Gerrit <chrome-bot@google.com> | 2012-03-16 11:24:50 -0700 |
| commit | 8230258498a8448aa5b210c1356174f99b1352b8 (patch) | |
| tree | fb7298344b806ede1acc06fa080c3cb39a6d7f65 | |
| parent | 9c3e90d6a1086754c6899792dd3d8e19c0c8c03e (diff) | |
Remove code that disabled cache in _x86boot_start
When U-boot is loaded via verified boot it starts at the
_x86boot_start entry point and promptly disables caching,
resulting in about a 500ms hit to boot time.
BUG=chrome-os-partner:8518
TEST=boot on lumpy with RW BIOS and gather timestamps
to observe 500ms less time spent in u-boot init.
Change-Id: I4eb1ad5ebcb20a156fef77452030e47a5e510115
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/18371
Reviewed-by: Stefan Reinauer <reinauer@google.com>
| -rw-r--r-- | arch/x86/cpu/start.S | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S index bb908a6654..4ff9e12293 100644 --- a/arch/x86/cpu/start.S +++ b/arch/x86/cpu/start.S @@ -47,12 +47,6 @@ _x86boot_start: cli cld - /* Turn of cache (this might require a 486-class CPU) */ - movl %cr0, %eax - orl $(X86_CR0_NW | X86_CR0_CD), %eax - movl %eax, %cr0 - wbinvd - /* Tell 32-bit code it is being entered from an in-RAM copy */ movw $GD_FLG_WARM_BOOT, %bx jmp 1f |