lkml.org 
[lkml]   [2000]   [Nov]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: KERNEL BUG: console not working in linux
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:47    [W:0.085 / U:11.372 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site