Messages in this thread |  | | Date | Tue, 28 Nov 2000 02:36:52 +0100 | From | Andries Brouwer <> | Subject | Re: 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/
|  |