[Qemu-devel] Re: Thanx for the kqemu patches; some notes about NetBSD/OpenBSD guests

[Sebastian Herbszt]

Juergen Lock wrote:
> 2. NetBSD doesn't seem to particularly like qemu's acpi tables, it
> apparenly doesn't find a pci bus and anything on it in that case
> (like a nic our audio card; `pcictl pci0 list' says Device not configured.)
>
> 3. When I disable acpi either via the boot menu or via -no-acpi it still
> has trouble assigning pci irqs correctly (like, uses irq 12 instead of 11
> for the nic) - this seems to have something to do with the emulated
> io-apic that it still picks up in that case - if I disable that by
> building a new bios that has this patch reverted,
> pc-bios/bios-pq/0003_kvm-bios-generate-mptable-unconditionally.patch
> the irqs at least get assigned correctly.  (Maybe the bios should only
> pass an mptable for a single cpu when there also is acpi?)

With "-no-acpi" there is no PIIX4 PM added to the bus. If i don't mistake the
mp and acpi tables aren't affected by this.

The mptable doesn't contain a pci bus entry (just isa). The linux kernel does
complain if booted with "acpi=off"; maybe NetBSD is more picky.

> Oh, if anyone wants dmesg.s of the various with/without acpi/io-apic
> combinations I can post those too, the patched bios I just put at:
> http://people.freebsd.org/~nox/qemu/pc-bios-0.10.5-no-default-mptable/bios.bin

I would like to see the output.

> (I had to end up building it on a Linux guest, our assembler said things
> like
> rombios32start.S:56: Error: `0(%ebx)' is not a valid 16 bit base/index 
> expression
> .)

What's your tool chain (gcc, binutils,...) ?

- Sebastian