[meta-ti] Stumped. Can't get 2.6.37 TI kernel to boot when built with toolchain from denzil or Linaro gcc-linaro-arm-linux-gnueabihf-4.8-2013.07-1_linux/

[Chris Larson]

On Thu, Aug 15, 2013 at 8:52 AM, Brian Hutchinson <b.hutchman at gmail.com>wrote:

> I have a custom TI816x board that uses a modified kernel from the TI PSP.
>  Kernel is of the 2.6.37 flavor.  I'm trying to migrate to OE Core
> environment and I'm having trouble with getting the kernel to work.
>
> With the toolchain in denzil (gcc version 4.6.4 20120303), kernel will at
> least boot but will die with:
>
> Unable to handle kernel NULL pointer dereference at virtual address
> 00000002
> pgd = c0004000
> [00000002] *pgd=00000000
> Internal error: Oops: 5 [#1]
>
> Any of the more modern toolchains (poky/meta-ti master or Linaro
> (gcc-linaro-arm-linux-gnueabihf-4.8-2013.07-1_linux) are used, the kernel
> won't even make a peep ... nothing is displayed.
>

I haven't seen the panic, but I have seen a complete silent boot hang when
moving from 4.6 to 4.7 or 4.8 on my OMAP5 EVM board. The gcc-linaro
toolchain worked, as did a 2012.03 sourcery toolchain, but neither the
2013.05 toolchain nor the internal built yocto toolchain from 1.5/master
resulted in a successful boot. I got past that issue by cherry picking
these two commits from a more recent kernel:

455bd4c430b0c0a361f38e8658a0d6cb469942b5 - ARM: 7668/1: fix memset-related
crashes caused by recent GCC (4.7.2) optimizations
418df63adac56841ef6b0f1fcf435bc64d4ed177 - ARM: 7670/1: fix the memset fix

See also
http://comments.gmane.org/gmane.comp.handhelds.openembedded.core/39864

Presumably you may need more than just that since you're also hitting a
panic with 4.6, but it may be worth trying those as a starting point. Good
luck!
-- 
Christopher Larson
clarson at kergoth dot com
Founder - BitBake, OpenEmbedded, OpenZaurus
Maintainer - Tslib
Senior Software Engineer, Mentor Graphics
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