[Qemu-devel] FreeBSD status

[Qemu-devel] FreeBSD status

[Juergen Lock]

As mentioned on irc I was having some success with FreeBSD:

 4.10RC3 install cd: boots, but kernel doesnt see any disks
(error message when trying to partition, -hda with empty image)

 5.2.1 install cd and boot.flp: boot now with the fixes in cvs,
but panic when trying to write to disk (same empty image).
to repeat: at the mountroot prompt type:
	ufs:md0
then in sysinstall select custom install, partition, `c',
enter slice (partition) size, hit `w' to write immediately,
confirm, select mbr -> panic writing to disk

 I also get: npx0: WARNING: no FPU! from the kernel (kernel
messages can be viewed with scroll-lock and then page-up/down,
cursur-up/down), Fabrice says that the FPU error comes from the fact
that FreeBSD uses FPU interrupts to test the FPU exception reporting.

 FreeSBIE 1.0 (live cd based on 5.2.1): boots now too, panics on:
	dd count=1 </dev/zero >/dev/ad0
(write a block to hda, same empty image)
I haven't tried running X on it yet (xinit)

 Install isos and releases (floppies etc) can be found using:
	http://mirrorlist.freebsd.org/
(the floppies are also on the cds under floppies/)

 FreeSBIE mirrors are listed at:
	http://www.freesbie.org/?section=mirror-en

 Fabrice also said the FreeBSD host patches are not in yet,
is that just lack of time or do they have some problems?

 Also, would it help if i try to make a debug version of the 5.2.1
GENERIC kernel to see where the panic is?  It is always trying to
read from 0x2c, supervisor read, page not present. (I guess a NULL
pointer to a struct, unfortunately i won't be able to take crashdumps
and get a full backtrace as that requires writing to disk...)

	Juergen

Re: [Qemu-devel] FreeBSD status

[Fabrice Bellard]

Juergen Lock wrote:
> As mentioned on irc I was having some success with FreeBSD:
> 
>  4.10RC3 install cd: boots, but kernel doesnt see any disks
> (error message when trying to partition, -hda with empty image)
> 
>  5.2.1 install cd and boot.flp: boot now with the fixes in cvs,
> but panic when trying to write to disk (same empty image).
> to repeat: at the mountroot prompt type:
> 	ufs:md0
> then in sysinstall select custom install, partition, `c',
> enter slice (partition) size, hit `w' to write immediately,
> confirm, select mbr -> panic writing to disk

I found the problem : it seems that FreeBSD expects the IDE READY status 
bit just after the IDE WRITE command. It is weird as it is not 
mentionned in the IDE specs. I would like to be sure it is a standard 
IDE behaviour.

>  I also get: npx0: WARNING: no FPU! from the kernel (kernel
> messages can be viewed with scroll-lock and then page-up/down,
> cursur-up/down), Fabrice says that the FPU error comes from the fact
> that FreeBSD uses FPU interrupts to test the FPU exception reporting.

I made a fix (not commited yet).

>  Fabrice also said the FreeBSD host patches are not in yet,
> is that just lack of time or do they have some problems?

Still no time.

>  Also, would it help if i try to make a debug version of the 5.2.1
> GENERIC kernel to see where the panic is?  It is always trying to
> read from 0x2c, supervisor read, page not present. (I guess a NULL
> pointer to a struct, unfortunately i won't be able to take crashdumps
> and get a full backtrace as that requires writing to disk...)

Fabrice.

Re: [Qemu-devel] FreeBSD status

[Juergen Lock]

On Wed, May 26, 2004 at 03:56:18PM +0000, Fabrice Bellard wrote:
> Juergen Lock wrote:
> > As mentioned on irc I was having some success with FreeBSD:
> > 
> >  4.10RC3 install cd: boots, but kernel doesnt see any disks
> > (error message when trying to partition, -hda with empty image)
> > 

4.10-RELEASE boot.flp can be found using
	http://mirrorlist.freebsd.org/
 btw. (yes 4.10-RELEASE is out, i'm currently ftp'ing it.  4.10 is
off the -stable branch so its also important to get working.)

> >  5.2.1 install cd and boot.flp: boot now with the fixes in cvs,
> > but panic when trying to write to disk (same empty image).
> > to repeat: at the mountroot prompt type:
> > 	ufs:md0
> > then in sysinstall select custom install, partition, `c',
> > enter slice (partition) size, hit `w' to write immediately,
> > confirm, select mbr -> panic writing to disk
> 
> I found the problem : it seems that FreeBSD expects the IDE READY status 
> bit just after the IDE WRITE command. It is weird as it is not 
> mentionned in the IDE specs. I would like to be sure it is a standard 
> IDE behaviour.
> 
 Hmm.  I since built a debug kernel and it looks like the panic is in
sys/dev/ata/ata-lowlevel.c line 276:
	if (request->device->channel->dma->flags & ATA_DMA_ACTIVE)
request->device->channel->dma is NULL.  The 5.2.1 ata-lowlevel.c can
be viewed here:
	http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/dev/ata/ata-lowlevel.c?annotate=1.24.2.3

 (to see other 5.2.1 sources look for the RELENG_5_2_1_RELEASE tag.)

 This seems to have something to do with the fact that qemu doesn't
support ata (ide) dma (right?), but it is a bit strange as i do have
seen 5.2.1 running on an old 486 about which i doubt that it has
ide dma hardware, and anyway i'm pretty sure such a bug would have
been known by now...

 Btw can you post or send me your patch so i can test it?

> >  I also get: npx0: WARNING: no FPU! from the kernel (kernel
> > messages can be viewed with scroll-lock and then page-up/down,
> > cursur-up/down), Fabrice says that the FPU error comes from the fact
> > that FreeBSD uses FPU interrupts to test the FPU exception reporting.
> 
> I made a fix (not commited yet).
> 
 Eagerly awaiting that one also... :)

	Juergen