Re: KERNEL BUG: console not working in linux

[Andries Brouwer]

On Mon, Nov 27, 2000 at 08:27:38PM +0100, Petr Vandrovec wrote:

>   could original complainer (and peoples with AMD SC*) test following
> patch? It just does nothing in case that A20 enabled bit is already
> set - such as in case when there is nobody listening on 0x92 and
> so inb returns 0xFF... (patch is for 2.4.0-test11) 
> 
> --- linux/arch/i386/boot/setup.S.orig Mon Oct 30 23:44:29 2000
> +++ linux/arch/i386/boot/setup.S      Mon Nov 27 20:22:04 2000
> @@ -647,8 +647,11 @@
>  #    Brown from Linux 2.2
>  #
>       inb     $0x92, %al                      # 
> +     testb   $02, %al
> +     jnz     no92
>       orb     $02, %al                        # "fast A20" version
>       outb    %al, $0x92                      # some chips have only this
> +no92:
>  

What about adding an additional

        andb    $0xfe, %al

in front of the outb?
If I understand things correctly, bit 0 of 0x92 is write-only
on some hardware, and writing 1 to it causes a reset, so we
never want that.

Andries
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