ppc: OpenFirmware boot loader hangs on QEMU

[andreasf]

The PowerPC boot loader is broken under QEMU. After 0.9.1, QEMU switched from the unmaintained OpenHackWare firmware to ​OpenBIOS, a real OpenFirmware implementation. This may have introduced regressions on either side.

Both the default Old World machine (-M g3beige)

qemu-system-ppc -boot d -cdrom haiku-boot-cd-ppc.iso

and the New World machine

qemu-system-ppc -M mac99 -boot d -cdrom haiku-boot-cd-ppc.iso

result in:

Welcome to OpenBIOS v1.0 built on May 22 2010 12:55


checking for memory...
0: base = 0x00000000, size = 134217728
1: empty region
total physical memory = 128 MB
suggested page table size = 1048576
need new page table, size = 1048576!
new table at: 0x07f00000

[andreasf]

A few memory layout issues have been fixed in OpenBIOS r908. Haiku proceeds slightly further now:

checking for memory...
0: base = 0x00000000, size = 134217728
total physical memory = 128 MB
suggested page table size = 1048576
need new page table, size = 1048576!
new table at: 0x07a00000
MSR: 0x00003030
found 6 translations
found exception handlers!
found page table!

[andreasf]

The issue appears to be with mtsrin.

https://dev.haiku-os.org/browser/haiku/trunk/src/system/boot/platform/openfirmware/arch/ppc/mmu.cpp?rev=39430#L803

[kallisti5]

​http://pub.haikufire.com/extra/qemu-ppc/

Last I checked, the OpenBIOS was hanging due to lack of an Apple Openfirmware property... ​http://lists.openbios.org/pipermail/openbios/2011-July/006567.html

[kallisti5]

​http://permalink.gmane.org/gmane.comp.bios.openbios/4792 has more info on how to get around the bug.. not a valid solution but shows how to get further in the.

[kallisti5]

As of hrev51852, PowerPC builds again. If you apply the "fix" (hack) in https://dev.haiku-os.org/ticket/6071#comment:6 , you get hung up at partition probing.