Hi Michael,

Thanks a lot for your answer. They reasoned that "starting cpu hw idx 
0... failed" is reported because that core of the CPU is already up and 
running.

I have built a git kernel from 2014-04-02.

-> git clone 
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git linux-git
-> git show 3e75c6de1ac33fe3500f44573d9212dc82c99f59
-> git checkout -f 3e75c6de1ac33fe3500f44573d9212dc82c99f59; git clean -fdx

This kernel booted and showed a Kernel Panic with the following error 
message:

Oops: Machine check, sig: 7 [#1]

Rgds,

Christian


On 05.05.2014 07:48, Michael Ellerman wrote:

On Sun, 2014-05-04 at 18:02 +0200, Christian Zigotzky wrote:

quoted

Hi All,

The RC 1, 2, and 3 of the kernel 3.15 don't boot on my PA6T board with a
Radeon HD 6870 graphics card.

Screenshot:
http://forum.hyperion-entertainment.biz/download/file.php?id=1060&mode=view

The kernel 3.14 starts without any problems. Has anyone a tip for me,
please?

The line that says "starting cpu hw idx 0... failed" looks a little worrying.
Do you see that on 3.14 as well?

Otherwise bisection is probably your best bet.

cheers