Re: [Qemu-devel] [PATCH] Floppy: Remove Sense Interrupt Hack

[Blue Swirl]

On 12/18/08, Justin Chevrier <address@hidden> 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 <address@hidden>

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