Comments on: Updated Qemu for MIPS emulation

By: Neozeed

Neozeed — Wed, 24 Feb 2010 17:35:18 +0000

looking at pc.c & mips_jazz.c it would seem to be a matter of setting up a esp_init instead of allowing the

pci_create_simple(pci_bus,-1,"lsi53c895a");

To do it's thing....

I'm sure there has to have been someone out there vendor wise that used the 53c9x chipset, and just clone their settings...

By: Neozeed

Neozeed — Wed, 24 Feb 2010 17:32:01 +0000

Oh I'm sorry I didn't realize it was another chipset!

sigh, I just launched the MIPS thing to see that yeah, it's the NCR 53C9x SCSI controller.

By: atar

atar — Wed, 24 Feb 2010 11:03:59 +0000

Probably I misunderstood your post. I thought you launched a MIPS-NT on a MIPS guest. But from the command line above, it looks like it were MIPS host and a usual NT/i386?

Yes, scsi can be plugged into an i386 machine, but it's an LSI (as you mentioned) and not ESP. A MIPS machine would have the ESP scsi controller.

By: Neozeed

Neozeed — Wed, 24 Feb 2010 04:33:45 +0000

Ok I'm back, and what I've re-created is that simply the newer builds of Qemu have the SCSI 'waiting' for the i386, you just simply have to attach some devices, and it'll enable it.

qemu -L . -hda one.disk -cdrom r:\ISOIMAGES\winnt40wks_sp1_en.iso -d
rive file=scsi.disk,if=scsi -net nic -net user -fda scsi.vfd

So the above will create a machine generic enough for me to get a scsi disk for WindowsNT 4.0. The SCSI driver I'm using is this one:

http://www.lsi.com/cm/License.do?url=http://www.lsi.com/DistributionSystem/AssetDocument/files/support/ssp/sdms/WinNT/nt896.zip&prodName=LSI53C895A&subType=Driver&locale=EN

Naturally there is no BIOS, so you can't boot from the scsi disk.. I suppose it wouldn't stop someone with an LSI controller from copying the ROM though..

The latest QEMU snapshots don't get along with Windows NT 4.0, though.. I suspect it's the new bios, but the new Qemu won't boot with the old bios either…….

By: atar

atar — Mon, 22 Feb 2010 17:38:38 +0000

ah, Solaris is not that exiting yet: the versions 2.4 (probably 2.0) - 2.5.1 seem to be fully functional, 2.6 works good in a single user mode, 7-9 boot kernel (have a hack to boot them till single user mode, but don't have time to rewrite and push it upstream).

Looking for synergies with other platforms to exclude sparc-specific bugs. Up now I see only two modules which can be in other platforms: ESP (aka Slavio/NCR) and Lance (aka Macio).

I see from the qemu source that ESP is used in mips[el][64], but don't know whether ESP is really used by any legacy OS.

By: Neozeed

Neozeed — Mon, 22 Feb 2010 16:44:11 +0000

I'm about to jump on a palne, but tonite I'll try to dig out what I did, regarding scsi on the pc...

I modidied the scsi disk enough to identify itself as a tape drive, but it seemed all the software I had wanted specific models....

one day I'll have to push harder with tme source and some sunos/solaris source I found.

By: atar

atar — Mon, 22 Feb 2010 15:16:01 +0000

Tape drive, wow! Have you managed it?

Though about pci scsi but I'm not sure whether there were any NCR53C9X pci adapters. There were isa ones, but I don't want to mess with ISA bugs on top of the SCSI-disk and ESP ones :).

But I thought some MIPS/Jazz/PPC models were equipped with the ESP controller.

By: Neozeed

Neozeed — Mon, 22 Feb 2010 14:39:07 +0000

I'm pretty sure you can 'hack' the source to enable the pci scsi on any pci qemu machine… I've done it for the i386 to test some scsi stuff when I had hopes of emulating a tape drive for netware……

By: atar

atar — Mon, 22 Feb 2010 14:22:26 +0000

Looks cool! Do you know whether any of qemu platforms where you run NT has the ESP (aka NCR53C9X) SCSI controller? It were a good cross test case for qemu-sparc.
Currently I don't expect more bugs in ESP, but who knows…