Qoriq P5020 PowerPC board doesn't boot with the latest git version anymore

Hi All,

I tested the latest Git kernel version on my Varisys Cyrus Plus board 
(A-EON AmigaOne X5000) [1][2] with a Qoriq P5020 PowerPC CPU from NXP 
today. Unfortunately it doesn't boot anymore.

My Varisys Nemo board (A-EON AmigaOne X1000) [3], boots without any 
problems.

I bisected between the final kernel 4.14.0 and the git version from Mon 
Nov 13 21:14:07 2017 -0800.

a8a217c22116eff6c120d753c9934089fb229af0 is the first bad commit. [4]

Please find attached the git bisect log.

I tried to revert the bad commit I have found with bisect but 
unfortunately it doesn't work because of some conflicts.

git revert a8a217c22116eff6c120d753c9934089fb229af0

error: could not revert a8a217c... locking/core: Remove 
{read,spin,write}_can_lock()
hint: after resolving the conflicts, mark the corrected paths
hint: with 'git add <paths>' or 'git rm <paths>'
hint: and commit the result with 'git commit'

I tried to revert the bad commit in the git version from Mon Nov 13 
21:14:07 2017 -0800 but unfortunately it doesn't work either.

error: could not revert a8a217c... locking/core: Remove 
{read,spin,write}_can_lock()
hint: after resolving the conflicts, mark the corrected paths
hint: with 'git add <paths>' or 'git rm <paths>'
hint: and commit the result with 'git commit'

Could you please help me to find the bug?

Thanks,
Christian


[1] http://www.amigaos.net/hardware/133/amigaone-x5000
[2] http://wiki.amiga.org/index.php?title=AmigaONE_X5000
[3] https://en.wikipedia.org/wiki/AmigaOne_X1000
[4] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a8a217c22116eff6c120d753c9934089fb229af0