Re: [OpenBIOS] SPARC64 device tree model - SBUS or PCI?

[Artyom Tarasenko]

On 2/26/12, Blue Swirl  wrote:
> On Sun, Feb 26, 2012 at 12:13, Mark Cave-Ayland
>  wrote:
> > Hi all,
> >
> > I've been spending some time recently trying to figure out why the SPARC64
> > serial console doesn't appear to work outside of OpenBIOS under QEMU, and
> > so
> > was looking at the example device trees in the Debian sparc-utils package.
>
> Maybe on the real machine, serial console isn't using the 'su' devices
> (PC serial) but 'se' device which does not exist in QEMU?

Yes, at least Ultra-5 uses "se" ports for ttya and ttyb.

Linux, Solaris and NetBSD are able to handle zs, se and su ports. But
since qemu-sparc64 doesn't have a compatible IRQ controller, the
serial ports under qemu can be used only in polling mode. Or perhaps
via promlib.
> > Now AFAICT the examples/ultra2 file represents an Ultra 2 SBUS which is
> > different from QEMU which I believe is attempting to emulate an Ultra 2
> > PCI
> > (Sabre) system. I know there was some talk previously on the mailing list
> > about which device model to use moving forward, but I don't remember a
> > definite decision being made. If QEMU is going to continue to use a
> > PCI-based system, does anyone have a copy of the prtconf output for such a
> > system?
>
> IIRC we discussed earlier about using Ultra 5 which doesn't have a SBus.
> > ATB,
> >
> > Mark.