From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3D9A998F.9010606@ellemedia.com> Date: Wed, 02 Oct 2002 10:00:31 +0300 From: Apostolos Meliones MIME-Version: 1.0 To: linuxppc-embedded@lists.linuxppc.org Subject: Patch to recover from segmentation fault on HiP4 MPC8260 versions (for kernels 2.4.x, x<10) Content-Type: text/plain; charset=us-ascii; format=flowed Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Here you may find a simple patch for 2.4 kernels up to version 2.4.10 to support the HiP4 versions of MPC82xx: In arch/ppc/kernel/misc.S replace _GLOBAL(_get_PVR) with the following: _GLOBAL(_get_PVR) mfspr r3,PVR xor r17,r17,r17 xor r16,r16,r16 addi r17,r17,0x7FFF@l addi r16,r16,0x10@l slw r17,r17,r16 ori r17,r17,0xFFFF@l and r3,r3,r17 blr Best Regards Apostol ---------------------------------------- Dr. Apostol Meliones Ellemedia Technologies 223 Syngrou Ave., 17121, Athens, Greece Tel: +30-10-9373095, Fax: +30-10-9370386 Allen Curtis wrote: >>We moved to a new kernel (we were using 2.4.7) to support the PVR of the >>HiP4 versions of MPC826x, so we tested 2.4.12, 2.4.18 and 2.4.20. We did >>our porting mostly on 2.4.20. We had almost everything there. However, >>we encountered a serious error related to memory management regarding >>one of our drivers that was based on a port from MPC860 coded for kernel >>2.4.4. Alternatively, we kept on working in parallel on 2.4.7 to find >>out and cancel the PVR checks that were instructing the kernel to use an >>incorrect cpu among the several available processor versions. This was >>responsible for the segmentation fault. We deceived the kernel to take >>8264 for 8260 and this way the problem was solved !! >> > >Could you provide a patch for you modifications. If they are too ugly, just >send them to me. I am interested in maintaining an updated kernel for the >MPC processors. > >Thanks > > ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/