[OpenBIOS] PReP PowerPC "emulation"
andreas.faerber at web.de
Sun Sep 26 01:15:09 CEST 2010
Am 15.09.2010 um 11:06 schrieb Mark Cave-Ayland:
> Andreas Färber wrote:
>> qemu-system-ppc64 w/ either stock QEMU OpenBIOS or r862 with OSX
>> host and ppc MMU patches:
>> C>> annot manage 'OHCI USB controller' PCI device type 'usb':
>> >> 106b 3f (c 3 10)
>> >> =============================================================
>> >> OpenBIOS 1.0 [Aug 17 2010 14:41]
>> >> Configuration device id QEMU version 1 machine id 3
>> >> CPUs: 1
>> >> Memory: 128M
>> >> UUID: 00000000-0000-0000-0000-000000000000
>> >> CPU type PowerPC,970FX
>> Welcome to OpenBIOS v1.0 built on Aug 17 2010 14:41
>> 0 > load cd:,\ppc\chrp\bootfile.exe ok
>> 0 > go No valid state has been set by load or init-program
>> 0 > boot cd:,\ppc\chrp\bootfile.exe No valid state has been set by
>> load or init-program
>> 0 > dir cd:,\ppc\chrp
>> 2048 2007-07-03 17:39:44 .\
>> 2048 2007-07-03 17:32:05 ..\
>> 12487680 2007-07-03 17:39:24 bootfile.exe
>> 0 >
>>> Also, what format is the AIX bootloader - is it an ELF executable?
>> $ file /Volumes/CDROM/ppc/chrp/bootfile.exe
>> /Volumes/CDROM/ppc/chrp/bootfile.exe: ELF 32-bit MSB executable,
>> PowerPC or cisco 4500, version 1 (SYSV), statically linked,
>> corrupted section header size
> Right. So in the case that you see the message "No valid state has
> been set by load or init-program", this means that either the load
> failed or init-program failed to detect a valid ELF header for the
> current architecture.
> First thing to check is that the executable is being loaded from
> disk, e.g.
> load cd:,\ppc\chrp\bootfile.exe
> then dump the first 200 bytes of memory to make sure an ELF header
> is present (i.e. the load from disk was successful):
> load-base 200 dump
> If the ELF header is present then it must be init-program which is
> failing. If the ELF header is not present, you'll need to take a
> look in either libopenbios/load.c and/or libopenbios/elf_load.c at
> elf_load() and elf_init_program().
> The one thing that I did notice is that you are attempting to launch
> a PPC32 ELF file under a PPC64 Qemu, so perhaps it is the checks in
> is_elf() which are failing? Try taking a look at the relevant
> constants in include/arch/ppc/elf.h.
If I can trust printk, I do not arrive in the C load() function
(libopenbios/load.c) at all.
According to `debug open-dev`, path-resolution returns 0 for "load cd:,
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