[SeaBIOS] [PATCH 0/3] Run pvscsi driver entirely in 32bit mode.

[Don Koch]

On Wed, 14 May 2014 19:40:23 -0400
Kevin O'Connor <kevin at koconnor.net> wrote:

> On Wed, May 14, 2014 at 01:00:39PM -0400, Don Koch wrote:
> > On Fri, 27 Dec 2013 12:17:42 -0500
> > Kevin O'Connor <kevin at koconnor.net> wrote:
> > > As with the recent change to AHCI, if the pvscsi driver needs to jump
> > > into 32bit mode to access a register, then it's better to run the
> > > pvscsi driver entirely in 32bit mode.
> > > 
> > > Evgeny, can you take a look at this and give it a test?  Also, what
> > > command line do you use for testing?
> > > 
> > > I tried testing locally by adding:
> > > 
> > > -device pvscsi,id=pvscsi0 -device scsi-disk,bus=pvscsi0.0,drive=drive0 -drive id=drive0,if=none,file=dos-drivec-new
> > > 
> > > to my qemu command line (both qemu v1.6 and qemu v1.7), but it doesn't
> > > work for me even before my changes.  It hangs in
> > > pvscsi_wait_intr_cmpl().
> > 
> > Try the following patch to qemu. I was getting hangs in this routine due to
> > language definition/compiler/bogus input issues. The old one returned an
> > off-by-one value.
> 
> It still fails for me.  I patched qemu and ran it with the
> command-line above and it still causes a hang in SeaBIOS.

Not sure if this is your problem, but we noted an issue with the generated code
for seabios which includes the build machine name; depending on the length of
the machine name, it changed the value in an uninitialized variable that caused
hanging (or not). Shorter names seem to be less problematic.

> -Kevin

Still researching.

-d