Dear all, We are working on two identical custom boards. The first one is powered by MPC8260 (revision A.1, mask 1K22A), while in the second system MPC8260 is replaced with MPC8264 (revision A.0, mask 2K25A). Both systems are running Linux 2.4.7. MPC8264 is a new version of the MPC8260 PowerQuicc II microprocessor. Actually, it is the same cpu with some ATM additions and manufacturing technology at 0.25 microns. Quite unexpectedly, most of the user space applications stored in our JFFS flashdisk or NFS filesystem crash (yield a segmentation fault) when running on the 8264 board, while working perfectly on the 8260 one.
The problem reveals from within arch/ppc/mm/fault.c. User mode accesses cause a SIGSEGV signal from within the do_page_fault() function. I would be grateful if someone of you guys could provide any help. We feel that this problem might be relevant to a message posted to the list by Ralph Blach, dated Apr 02, 2001. At that time, he asked the list about what kind of errors are responsible for segmentation faults. Some days later he reported himself that marking all user pages as user/read/write in the kernel caused the segmentation faults at application layer. What is your opinion? Sincerely Yours Apostol ---------------------------------------- Dr. Apostol Meliones Ellemedia Technologies 223 Syngrou Ave., 17121, Athens, Greece Tel: +30-10-9373095, Fax: +30-10-9370386 ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
