From: Andries Brouwer <aeb@veritas.com>
To: Petr Vandrovec <vandrove@vc.cvut.cz>
Cc: "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org
Subject: Re: KERNEL BUG: console not working in linux
Date: Tue, 28 Nov 2000 02:36:52 +0100 [thread overview]
Message-ID: <20001128023652.A9368@veritas.com> (raw)
In-Reply-To: <E140Pc3-0003AI-00@the-village.bc.nu> <200011271849.eARInfc255418@saturn.cs.uml.edu> <8vubeq$r5r$1@cesium.transmeta.com> <20001127202738.A25168@vana.vc.cvut.cz>
In-Reply-To: <20001127202738.A25168@vana.vc.cvut.cz>; from vandrove@vc.cvut.cz on Mon, Nov 27, 2000 at 08:27:38PM +0100
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/
next prev parent reply other threads:[~2000-11-28 2:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-26 21:28 KERNEL BUG: console not working in linux Gianluca Anzolin
2000-11-26 23:53 ` Jorge Nerin
2000-11-27 14:05 ` Gianluca Anzolin
2000-11-27 14:50 ` Alan Cox
2000-11-27 18:49 ` Albert D. Cahalan
2000-11-27 19:08 ` H. Peter Anvin
2000-11-27 19:27 ` Petr Vandrovec
2000-11-28 1:36 ` Andries Brouwer [this message]
2000-11-28 1:40 ` H. Peter Anvin
2000-11-28 3:14 ` Andries Brouwer
2000-11-28 3:23 ` H. Peter Anvin
2000-11-27 19:52 ` Albert D. Cahalan
2000-11-27 19:59 ` H. Peter Anvin
2000-11-28 0:16 ` Gianluca Anzolin
[not found] ` <3A22EF3D.B97A0965@transmeta.com>
2000-11-28 9:33 ` Gianluca Anzolin
2000-11-28 18:14 ` H. Peter Anvin
-- strict thread matches above, loose matches on Subject: below --
2000-11-28 4:09 Dunlap, Randy
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20001128023652.A9368@veritas.com \
--to=aeb@veritas.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=vandrove@vc.cvut.cz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.