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

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This reverts commit 0d67fac29f3187e67f4fd3ef15f73e91be2fad12.

As real hardware testing (*) shows the above mentioned commit
breaks U-Boot on it. Revert for the upcoming release. We may get
more information in the future and optimize the code accordingly.

(*) on Intel Edison board.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: fix a typo in the commit message]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Andy Shevchenko 2020-02-17 17:30:12 +02:00 committed by Bin Meng
parent 38a2a48cd9
commit fa97ca161b
2 changed files with 2 additions and 2 deletions
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2
arch/x86/cpu/start.S
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@ -50,7 +50,7 @@ _x86boot_start:
movl %cr0, %eax
orl $(X86_CR0_NW | X86_CR0_CD), %eax
movl %eax, %cr0
invd
wbinvd
/*
* 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
invd
wbinvd
/* load the temporary Global Descriptor Table */
data32 cs lidt idt_ptr