PPC 440 System
I have an IBM ebony development board which has a PPC 440 processor. I am trying to build a development system for it. It currently loads a cross compiled kernel and kicks out messages via the first serial port, no vga. It mounts the root fs via nfs and tries to exec /sbin/init. At this point the system appears to hang.
If I remove /sbin/init from the nfs root the kernel panics as expected, so I assume root is mounted ok. I have tried to build a minimum root filesystem which contains /dev/console, /dev/ttyS0 and a statically linked /sbin/init. The init just does a printf but I do not see this message. Does anyone know it this should work ?
Initially I tried to build a root filesystem from files on a Mac Clone running Yellow Dog Linux. I believe this has a PPC 604e processor. Should this systems binaries/libraries run on the 440GP ?
Can I expect a statically linked executable, made on the Mac, to run on the 440GP?
Many Thanks
Simon.
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Simon Haynes - Baydel
Phone : 44 (0) 1372 378811
Email : [email protected]
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simon> If I remove /sbin/init from the nfs root the kernel panics simon> as expected, so I assume root is mounted ok. I have tried simon> to build a minimum root filesystem which contains simon> /dev/console, /dev/ttyS0 and a statically linked simon> /sbin/init. The init just does a printf but I do not see simon> this message. Does anyone know it this should work ?
Yes, a static /sbin/init should work.
simon> Initially I tried to build a root filesystem from files on simon> a Mac Clone running Yellow Dog Linux. I believe this has a simon> PPC 604e processor. Should this systems binaries/libraries simon> run on the 440GP ?
simon> Can I expect a statically linked executable, made on the simon> Mac, to run on the 440GP?
Probably not. The 440GP has no floating point hardware, so you will need (at least) to build a special glibc without FP instructions and also make sure your gcc is set up not to generate FP instructions.
Your best bet is probably to download ELDK (a free Embedded Linux Development Kit) from www.denx.de. Dan Kegel also has some good PPC 4xx cross development information at www.kegel.com.
Best,
Roland
Quoted 14 lines · Roland Dreier
simon> If I remove
/sbin/initfrom the nfs root the kernel panics simon> as expected, so I assume root is mounted ok. I have tried simon> to build a minimum root filesystem which contains simon>/dev/console,/dev/ttyS0and a statically linked simon>/sbin/init. The init just does a printf but I do not see simon> this message. Does anyone know it this should work ?Yes, a static
/sbin/initshould work.simon> Initially I tried to build a root filesystem from files on simon> a Mac Clone running Yellow Dog Linux. I believe this has a simon> PPC 604e processor. Should this systems binaries/libraries simon> run on the 440GP ?
Quoted 6 lines
simon> Can I expect a statically linked executable, made on the simon> Mac, to run on the 440GP?
Probably not. The 440GP has no floating point hardware, so you will need (at least) to build a special glibc without FP instructions and also make sure your gcc is set up not to generate FP instructions.
You can build a 440 kernel with FPU emulation and it will run native apps just fine, otherwise they'll core dump. I bootstrapped a full native Debian PPC system on an Ebony board a few months ago.
Signature · 1 line
Matt Mackall : http://www.selenic.com : of or relating to the moon
I don't understand. Can I not just use the math emulation in the kernel ?
Cheers
Simon.
Quoted 25 lines · Roland Dreier
simon> If I remove
/sbin/initfrom the nfs root the kernel panics simon> as expected, so I assume root is mounted ok. I have tried simon> to build a minimum root filesystem which contains simon>/dev/console,/dev/ttyS0and a statically linked simon>/sbin/init. The init just does a printf but I do not see simon> this message. Does anyone know it this should work ?Yes, a static
/sbin/initshould work.simon> Initially I tried to build a root filesystem from files on simon> a Mac Clone running Yellow Dog Linux. I believe this has a simon> PPC 604e processor. Should this systems binaries/libraries simon> run on the 440GP ?
simon> Can I expect a statically linked executable, made on the simon> Mac, to run on the 440GP?
Probably not. The 440GP has no floating point hardware, so you will need (at least) to build a special glibc without FP instructions and also make sure your gcc is set up not to generate FP instructions.
Your best bet is probably to download ELDK (a free Embedded Linux Development Kit) from www.denx.de. Dan Kegel also has some good PPC 4xx cross development information at www.kegel.com.
Quoted 7 lines
Best,
Roland
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Simon Haynes - Baydel
Phone : 44 (0) 1372 378811
Email : [email protected]
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This should have been on linuxppc-embedded.
Quoted 1 line · On Tue, Jul 15, 2003 at 10:24:13AM +0100, [email protected] wrote:
I don't understand. Can I not just use the math emulation in the kernel ?
Yes you can. However, most developers on PPC4xx are interested in eventual deployment. Kernel math emulation is slow relative to a soft float enabled userland so using something like ELDK or MVL with PPC4xx/8xx makes a lot more sense. If you want to leverage binaries from Yellowdog/Debian/foo that are compiled for a classic PPC processor rather than natively then you'll need to enable math emulation.
Regards,
Signature · 2 lines
Matt Porter [email protected]