I discovered there is still an old bug in the plat-omap/mailbox.c omap_mailbox_get function in the Arago kernel version (TI81XXPSP, SDK), which prevents compilation with gcc > 4.5. See [1].
>4.5 the compiler stored the structs differently and the dormant error became active.
Since I didn't know at first where the notifyk error came from I found it and fixed it. After that I saw that it is fixed in the mainstream kernel already (see [2]).
Furthermore it is mentioned in the forum in [3].
If it is possible, please integrate the patch into Arago linux.git.
Kind Regards,
Markus Hofstätter