[PATCH 02/13] x86: Adjust search range for sysinfo table

[Bin Meng]

Hi Simon,

On Tue, Feb 21, 2023 at 3:49 AM Simon Glass <sjg at chromium.org> wrote:
>
> Avoid searching starting at 0 since this memory may not be available

Please describe in more detail why memory address 0 is not available?

> and the table cannot be there anyway. Start at 0x400 instead.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
>  arch/x86/cpu/cpu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
> index 6fe6eaf6c84..3394e5b523c 100644
> --- a/arch/x86/cpu/cpu.c
> +++ b/arch/x86/cpu/cpu.c
> @@ -352,7 +352,7 @@ long locate_coreboot_table(void)
>         long addr;
>
>         /* We look for LBIO in the first 4K of RAM and again at 960KB */

And update the comment here for the memory address 0 too.

> -       addr = detect_coreboot_table_at(0x0, 0x1000);
> +       addr = detect_coreboot_table_at(0x400, 0xc00);
>         if (addr < 0)
>                 addr = detect_coreboot_table_at(0xf0000, 0x1000);
>
> --

Regards,
Bin