brain-hackers_pepepper-mirror/u-boot-brain
1
0
Fork 0
mirror of https://github.com/brain-hackers/u-boot-brain synced 2024-09-27 23:20:26 +09:00
Code Issues Projects Releases Wiki Activity

x86: use invd instead of wbinvd in real mode start code

Browse Source 
I do not know why the boot code immediately after the system reset
should write-back the cache content. I think the cache invalidation
should be enough.

I tested this commit with qemu-x86_defconfig, and it worked for me.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Masahiro Yamada 2020-01-08 20:08:44 +09:00 committed by Bin Meng
parent a6302b7085
commit 0d67fac29f
2 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/cpu/start.S
View File

@ -50,7 +50,7 @@ _x86boot_start:
movl %cr0, %eax
orl $(X86_CR0_NW | X86_CR0_CD), %eax
movl %eax, %cr0
wbinvd
invd
/*
* Zero the BIST (Built-In Self Test) value since we don't have it.

2
arch/x86/cpu/start16.S
View File

@ -28,7 +28,7 @@ start16:
movl %cr0, %eax
orl $(X86_CR0_NW | X86_CR0_CD), %eax
movl %eax, %cr0
wbinvd
invd
/* load the temporary Global Descriptor Table */
data32 cs lidt idt_ptr