Are you using a standard or custom board? Our MPC823-based custom board crashes occasionally on a page fault or other memory management related routine. We always get the kernel mode FPU software emulation panic. It seems that you are experiencing the same problem as we are.
It is interesting that you see this work on a PPC750 but not PPC823. Dan states that there are no instructions that are not supported by the 823 implemented in the Linux kernel; but a problem with the 32 TLB versus 8(??) hasn't been addressed, although that seems too obvious. We are very frustrated at this point, as we are working towards a manufacturable product. A kernel panic is not acceptable--it's a show stopper! We are going to go back to the BSE-IP board and run similar tests on both the Monta Vista and standard, patched kernels, (2.2.13) to "see" if it's related to our hardware and/or the kernel we are running. Any suggestions are welcome. Lucinda Schafer Staff Software Engineer Adaptive Micro-Ware, Inc. -----Original Message----- From: Patrick Lerda [mailto:[EMAIL PROTECTED] Sent: Wednesday, June 14, 2000 4:11 AM To: 'linuxppc-embedded at lists.linuxppc.org' Subject: MMU problems on Linux 8xx. (reliability...) I've a PPC823 board working with a recent linux kernel based on monta vista. When I try complex operation like compiling a kernel on this board, the kernel crash after a while. An illegal instruction is generated, linux see an opcode: *NIP=0, the illegal instruction occur in a glibc-2.1.3 page. The glibc page is not see properly... This problem seems to occur only on complex operation, and make this system not reliable. I also have a PPC750 board working with the same kernel with proper configuration, the only differences in code is the MMU part. Linux work properly and reliably on this board with the PPC860 software. if you have see a similar behaviour on you boards, or with differents processor. I know that the PPC823 is not 100% compatible with the PPC860, there is some differences on TLB available etc... And linux seems to be hard coded for 32 TLB... If you know how the MMU is handle on linux 8xx, and if you see a similar behavior let me know... Patrick LERDA ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
