diff options
| author | Simon Glass <sjg@chromium.org> | 2014-11-06 13:20:10 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2014-11-21 07:24:10 +0100 |
| commit | f67cd51e654ba6498230314b6e82b4dbbd4bfca7 (patch) | |
| tree | 9f0b5e3b81734484df64e8b679a0eb66532ec49a /arch/x86/cpu/start16.S | |
| parent | e1ffd81797d59652124bd9cda813a58644f5dea9 (diff) | |
x86: Save the BIST value on reset
The built in self test value is available in register eax on start-up. Save
it so that it can be accessed later. Unfortunately we must wait until the
global_data is available before we can do this, so there is a little bit of
shuffling to keep it around.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'arch/x86/cpu/start16.S')
| -rw-r--r-- | arch/x86/cpu/start16.S | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/cpu/start16.S b/arch/x86/cpu/start16.S index 445d5a1734..9550502e9a 100644 --- a/arch/x86/cpu/start16.S +++ b/arch/x86/cpu/start16.S @@ -21,6 +21,9 @@ .code16 .globl start16 start16: + /* Save BIST */ + movl %eax, %ecx + /* Set the Cold Boot / Hard Reset flag */ movl $GD_FLG_COLD_BOOT, %ebx @@ -45,9 +48,11 @@ o32 cs lgdt gdt_ptr /* Flush the prefetch queue */ jmp ff ff: - /* Finally jump to the 32bit initialization code */ + + /* Finally restore BIST and jump to the 32bit initialization code */ movw $code32start, %ax movw %ax, %bp + movl %ecx, %eax o32 cs ljmp *(%bp) /* 48-bit far pointer */ |