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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