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From: "Blue Swirl" <blauwirbel@gmail.com>
To: theburner1@yahoo.com, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] Floppy: Remove Sense Interrupt Hack
Date: Fri, 19 Dec 2008 21:43:35 +0200	[thread overview]
Message-ID: <f43fc5580812191143oe2c2f1dk4a089758c5ce60d5@mail.gmail.com> (raw)
In-Reply-To: <971426.41520.qm@web51103.mail.re2.yahoo.com>

On 12/18/08, Justin Chevrier <theburner1@yahoo.com> wrote:
> Hey guys,
>
>  I'm tracking down the next issue(s) with the Openserver installation. The current issue is that during installation when the installer tries to link the BLTD (eg. SCSI drivers) drivers into the kernel it is unable to access the floppy drive. After reviewing the debug logs it turns out that the installer dosen't like the value being returned by Sense Interrupt. The cause of this is a hack in the Sense Interrupt code that always returns an OR'd value based on FD_SR0_SEEK instead of the actual Status0 regsiter. The hack identifies that the floppy code is broken with regard to Status0 and Read/Writes. Outside of setting particular values in case of CRC errors/etc I can't identify from datasheets what we should be doing. I've tracked down what I believe is the original mailing list post regarding this hack and it seems to be related to Windows 2000 and higher OS's recognizing the floppy drive. I applied the patch below and verified that
>   detection/read/writes/formatting still work in Windows XP SP2.
>
>  Original post:
>  http://lists.gnu.org/archive/html/qemu-devel/2004-10/msg00076.html
>
>  SVN change:
>  http://svn.savannah.gnu.org/viewvc?view=rev&root=qemu&revision=1118
>
>  Having said the above does anyone know what the comment in the hack is referencing? Is it still needed? If so what needs to be done to eliminate it?
>
>  If it's no longer needed I propose the patch below.
>
>  Justin
>
>  Changelog:
>
>  Remove Sense Interrupt hack
>
>  Signed-off-by: Justin Chevrier <theburner1@yahoo.com>

It may be a hack, but if we remove it, Sparc64 refuses to boot and
prints endlessly:
SENSEI c0 00
SENSEI c0 00
SENSEI c0 00
SENSEI c0 00

  reply	other threads:[~2008-12-19 19:44 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-18 21:14 [Qemu-devel] [PATCH] Floppy: Remove Sense Interrupt Hack Justin Chevrier
2008-12-19 19:43 ` Blue Swirl [this message]
2008-12-19 21:41   ` Justin Chevrier
2008-12-20 10:54     ` Blue Swirl
2008-12-23 18:02 Justin Chevrier
2008-12-23 18:13 ` Blue Swirl
2008-12-23 18:30 ` Blue Swirl
2008-12-23 19:43   ` Carl-Daniel Hailfinger
2008-12-23 19:58     ` Blue Swirl
2008-12-23 21:46       ` Carl-Daniel Hailfinger
2008-12-23 18:13 Justin Chevrier

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