qemu PowerPC BSP?

[Joel Sherrill]

Till Straumann wrote:
> Joel Sherrill wrote:
>   
>> Hi,
>>
>> I am curious if we already have a BSP that will run on
>> the PowerPC simulator provided by qemu.
>>
>> $ qemu-system-ppc -M -?
>> Supported machines are:
>> g3beige    Heathrow based PowerMAC (default)
>> mac99      Mac99 based PowerMAC
>> prep       PowerPC PREP platform
>>     
> I recently tried the mvme2307 (which is PreP).
> IIRC I had to fix and hack quite a few things (in qemu)
> to get it to boot but gave up after it seemed that
> the OpenPIC didn't work out of the box.
> Could probably be hacked, too w/o too much effort
> but I ran out of time.
>
>   
Do you think the mtx603e variant might work?
Wasn't that a no bus version of the motorola_powerpc?
> IMO it would be useful to be able to use qemu
> but we should not abandon PSIM. The latter does
> have (quite buggy but I have filed a patch fixing
> many things) ALTIVEC emulation which qemu
> unfortunately lacks.
>
>   
There is no intention to drop PSIM.  :)
> OTOH the networking support of qemu is far
> superior.
>
>   
And qemu is being enhance to support coverage analysis
at the instruction and branch taken/not taken level.  It
already supports this on the PowerPC, x86, and leon2.  I
am trying to get coverage results on x86 and was hoping
that the PowerPC had a prayer of working.  That would
enable us to have object coverage testing on more CPUs.
There will be a more formal announcement in the near
future but here is the status of coverage testing on
SPARC and ARM. 

http://www.rtems.com/ftp/pub/rtems/people/joel/coverage/

The subset of code approaching 100% instruction coverage
is the cpukit directories posix, sapi, rtems and score when
at -Os.  I want to get to 100% at -O2 and remove the few
conditionals that are needed.  But comparing coverage
percentage from 4.7 to now, it is gone from ~75% to 99+%
on the same code at -Os.

So for me, PowerPC on qemu is primarily for coverage and
just more to test is better. :)

--joel
> T.
>   
>> ref405ep   ref405ep
>> taihu      taihu
>> bamboo     bamboo
>> mpc8544ds  mpc8544ds
>>
>> The taihu is an AMCC 405EP reference platform.
>> The bamboo is an AMCC 440EP reference platform.
>>
>> Shouldn't we have some BSPs that work on some of
>> those already?
>>
>>     
>
>   


-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill at OARcorp.com        On-Line Applications Research
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