Re: [PATCH] Make bootsector stub 16-bit-only (i386)

H. Peter Anvin
2007-05-05T18:08:28Z

Acked-by: H. Peter Anvin <hpa@zytor.com>

Alexander van Heukelum wrote:
> Hi!
>
> The x86 bzImage contains a stub to inform people that it is not possible
> any more to run a Linux kernel by catting it to a floppy and then
> booting from it. This was meant to be all 16-bit code. The first
> instruction, however, ended up as being coded as a 16:32-bit far jump. I
> assume the intention was a 16:16-bit far jump.
>
> This patch changes only i386.
>
> Greetings,
> Alexander
>
> Signed-off-by: Alexander van Heukelum <heukelum@mailshack.com>
>
> ---
>
> diff --git a/arch/i386/boot/bootsect.S b/arch/i386/boot/bootsect.S
> index 011b7a4..ae9df0d 100644
> --- a/arch/i386/boot/bootsect.S
> +++ b/arch/i386/boot/bootsect.S
> @@ -44,7 +44,7 @@ #endif
> _start:
>
> # Normalize the start address
> - jmpl $BOOTSEG, $start2
> + jmpw $BOOTSEG, $start2
>
> start2:
> movw %cs, %ax