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Date: Wed, 26 May 2004 00:34:36 +0200
From: Fabrice Bellard <fabrice@bellard.org>
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Subject: Re: [Qemu-devel] FreeBSD status
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To: qemu-devel@nongnu.org

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.