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    SubjectRe: KERNEL BUG: console not working in linux
    On Mon, Nov 27, 2000 at 11:08:10AM -0800, H. Peter Anvin wrote:

    > It would have been somewhat different if there had been a standard
    > BIOS function for enabling A20, but there isn't one.
    >
    > Sometimes, in the PC world, you just have to draw a line and say "this
    > is too broken to use". I think the original posters' video card falls
    > in that category. Get a new video card, they're cheap these days.

    Hi,
    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)
    Thanks,
    Petr Vandrovec
    vandrove@vc.cvut.cz


    --- 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:

    # wait until a20 really *is* enabled; it can take a fair amount of
    # time on certain systems; Toshiba Tecras are known to have this
    -
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