problems with ppc405 on 2.6.11.8.

problems with ppc405 on 2.6.11.8.

[Michael Richardson]

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A customer of mine has a PPC405 system, which was based upon the
Embedded Planet design. It runs U-boot 0.4.0, and the system currently
ships with a kernel based upon Timesys 2.4.18. 

We are in the process of upgrading to 2.6.11. (linus, not timesys. We
see no value add from timesys)

The major stumbling block was using boot/simple/{head,relocate}.S,
and the inftrees.c. For reasons we do not understand, the system would
fail in huft_build() when (setting up for) decompressing.  We traced
through this using our bdi2000, after failing with puts() additions. 

My gut instinct was originally that we were blowing our stack, or
overwriting running code while decompressing. 

Kyle McMartin tried (I'm not sure why yet) replacing the head.S with
the one from 2.4.18-timesys. It seemed to solve the problem.

I'm posting this in two hopes:
    a) that someone else not hit the same problem.
    b) that someone else might have a suggestion on 
       what might be different between head.S+relocate.S and head.S(2.4.18).

- -- 
] Michael Richardson          Xelerance Corporation, Ottawa, ON |  firewalls  [
] mcr @ xelerance.com           Now doing IPsec training, see   |net architect[
] http://www.sandelman.ca/mcr/    www.xelerance.com/training/   |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [



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Re: problems with ppc405 on 2.6.11.8.

[Matt Porter]

On Fri, May 13, 2005 at 07:37:02PM -0400, Michael Richardson wrote:
> A customer of mine has a PPC405 system, which was based upon the
> Embedded Planet design. It runs U-boot 0.4.0, and the system currently
> ships with a kernel based upon Timesys 2.4.18. 
> 
> We are in the process of upgrading to 2.6.11. (linus, not timesys. We
> see no value add from timesys)
> 
> The major stumbling block was using boot/simple/{head,relocate}.S,
> and the inftrees.c. For reasons we do not understand, the system would
> fail in huft_build() when (setting up for) decompressing.  We traced
> through this using our bdi2000, after failing with puts() additions. 

If you are booting off of U-boot, why are you trying to boot a
zImage?  You should be booting a uImage which doesn't use the
bootwrapper glue code in arch/ppc/boot/. Load the right image 
and you will avoid all of this.

-Matt

Re: problems with ppc405 on 2.6.11.8.

[Roger Larsson]

On Saturday 14 May 2005 01.37, Michael Richardson wrote:
> We are in the process of upgrading to 2.6.11. (linus, not timesys. We
> see no value add from timesys)
>
> - - -
>
> Kyle McMartin tried (I'm not sure why yet) replacing the head.S with
> the one from 2.4.18-timesys. It seemed to solve the problem.
>

:-)

/RogerL