[OpenBIOS] PReP PowerPC "emulation"

[Massimo Montecchi]

Mark, using your hints I was able to establish that the ELF header is not
present.
I will try (I'm not so expert in C) to take a look at the files you suggest
me.
Thanks, Ciao

2010/9/15 Mark Cave-Ayland <mark.cave-ayland at siriusit.co.uk>

> 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
>>  ok
>> 0 > boot cd:,\ppc\chrp\bootfile.exe No valid state has been set by load or
>> init-program
>>  ok
>> 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
>>  ok
>> 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
>>
>> Andreas
>>
>
> 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.
>
>
> HTH,
>
>
> Mark.
>
> --
> Mark Cave-Ayland - Senior Technical Architect
> PostgreSQL - PostGIS
> Sirius Corporation plc - control through freedom
> http://www.siriusit.co.uk
> t: +44 870 608 0063
>
> Sirius Labs: http://www.siriusit.co.uk/labs
>
> --
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>



-- 
Cordiali Saluti/Best Regards

Massimo Montecchi
Modena - Italy
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