Bill, Just a few things to try before launching into kernel stuff:
I'm not familiar with uMON, but I would guess it has some memory tests in it. Can you do burst reads/writes inside of uMON reliably? Without knowing anything else, from what I see here, I'm guessing that your problem is related to memory. But testing outside of the kernel will definitely help to rule that out. --Chris On Tue, Feb 25, 2003 at 04:46:19PM -0600, William A. Gatliff wrote: > > Guys: > > > I'm trying to run a recent (two weeks ago, Makefile has 2.4.21-pre4) > MV kernel on a semi-custom MPC8245 board that looks a lot like a > Cogent CSB281. I'm using binutils-2.13.1, gcc-3.2.1, uClibc-0.9.17, > busybox-0.60.4. I'm also using the uMON bootloader from the CSB281. > > The kernel boots up fine, and mounts an initial ramdisk (romfs-0.3.1) > containing a very minimal busybox environment. After a few ls -lR's, > the system freezes hard. > > According to my bdi2000, I usually end up in trap 700 before the CPU > halts. But sometimes I get pretty decent oops messages first: > > tulip_interrupt: ioaddr=c3000c00 tulip_debug=5 > Oops: kernel access of bad area, sig: 11 > NIP: C00F6EB4 XER: 20000000 LR: C00F7CE4 SP: C0117180 REGS: c01170d0 TRAP: > 0300 > Not tainted > MSR: 00001032 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 11 > DAR: 504067FC, DSISR: 20000000 > TASK = c0115440[0] 'swapper' Last syscall: 120 > last math c0902000 last altivec 00000000 > GPR00: 00000004 C0117180 C0115440 504067FC FFFFFFFE C01052FD C0117220 0000000A > GPR08: 00000000 504067FC FFFFFFFF C01171B8 C0140000 00000000 305C8801 B80688E6 > GPR16: D0040604 C3180200 00022412 00000000 00001032 00000000 00000000 00000019 > GPR24: 00000400 C0144FB4 C0117220 FFFFFFFF 504067FC C01453B3 00000000 C0144FB4 > Call backtrace: > C0015F94 C0015D0C C008DAB4 C0006F4C C0007010 C0005FAC C0007558 > C000756C C0003B38 C01275DC 00003828 > Kernel panic: Aiee, killing interrupt handler! > In interrupt handler - not syncing > <0>Rebooting in 180 seconds..Initializing the MPC8245 PCI Bridge > > (Yes, I also have problems without _any_ ethernet drivers installed). > > The rest of the time, everything is simply scrambled by the time I > type HALT on the bdi. > > I know what your answer will be, especially now that I've read the > mailing list archives over and over: "memory interface problem". I > tend to agree--- it's my main theory at the moment, in fact. I'm just > not sure what to do about it. Some questions: > > * Is there any reasonable explanation besides a memory problem? > > * I see the checksum for the kernel's .text region changing at > runtime. I'm pretty sure this isn't normal, is it? > > * Does anyone have a working CSB281 kernel (or similar) that I could > borrow? :^) Sandpoint won't get it, I don't have all the extra > hardware onboard (I think I look more like a Muenski). > > * Can anyone suggest a really conservative memory interface setup to > test with? The MPC8245 is a bit of a stretch for me at the moment... > > > Here's my .config. For brevity, I omitted everything that's not set. > > CONFIG_RWSEM_XCHGADD_ALGORITHM=y > CONFIG_HAVE_DEC_LOCK=y > CONFIG_EXPERIMENTAL=y > CONFIG_ADVANCED_OPTIONS=y > CONFIG_PPC=y > CONFIG_PPC32=y > CONFIG_6xx=y > CONFIG_PPC_STD_MMU=y > CONFIG_CSB281=y > CONFIG_PPC_ISATIMER=y > CONFIG_PCI=y > CONFIG_NET=y > CONFIG_SYSCTL=y > CONFIG_SYSVIPC=y > CONFIG_KCORE_ELF=y > CONFIG_BINFMT_ELF=y > CONFIG_KERNEL_ELF=y > CONFIG_BINFMT_MISC=y > CONFIG_PPC_RTC=y > CONFIG_CMDLINE_BOOL=y > CONFIG_CMDLINE="console=ttyS0,38400 root=/dev/ram" > CONFIG_BLK_DEV_LOOP=y > CONFIG_BLK_DEV_RAM=y > CONFIG_BLK_DEV_RAM_SIZE=4096 > CONFIG_BLK_DEV_INITRD=y > CONFIG_UNIX=y > CONFIG_INET=y > CONFIG_IP_PNP=y > CONFIG_IP_PNP_DHCP=y > CONFIG_IP_PNP_BOOTP=y > CONFIG_NET_ETHERNET=y > CONFIG_NET_PCI=y > CONFIG_PCNET32=y > CONFIG_TULIP=y > CONFIG_TULIP_MMIO=y > CONFIG_NATSEMI=y > CONFIG_NE2K_PCI=y > CONFIG_8139CP=y > CONFIG_SERIAL=y > CONFIG_SERIAL_CONSOLE=y > CONFIG_UNIX98_PTYS=y > CONFIG_UNIX98_PTY_COUNT=256 > CONFIG_TMPFS=y > CONFIG_RAMFS=y > CONFIG_PROC_FS=y > CONFIG_DEVPTS_FS=y > CONFIG_ROMFS_FS=y > CONFIG_NFS_FS=y > CONFIG_ROOT_NFS=y > CONFIG_SUNRPC=y > CONFIG_LOCKD=y > CONFIG_MSDOS_PARTITION=y > CONFIG_DEBUG_KERNEL=y > CONFIG_BDI_SWITCH=y > CONFIG_MORE_COMPILE_OPTIONS=y > CONFIG_COMPILE_OPTIONS="-g -ggdb" > > > > > I'm stumped. Thanks to _anyone_ who can help me make any progress on > this... > > > > > b.g. > -- > Bill Gatliff > http://billgatliff.com > ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
