Hi,
There is some progress. My kernel configuration was bad. I had ONFIG_EXPERIMENTAL which is needed for CONFIG_DEVFS_FS and CONFIG_DEVFS_MOUNT.
Now I can get a really simple ramdisk image (obtained from Xilinx) which only prints Hello world and echoes everything I type.
So I decided to try the ppc4xx ramdisk from DENX and I am getting this error
EXT2-fs error (device ramdisk(1,0)): ext2_check_page: bad entry in directory #2: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0
Does this imply that some entry in the filesystem is corrupted?
My kernel boot log and a gdb backtrace (via abatron) is below:
kernel boot log --------------- => bootm fe300000 fe500000 ## Booting image at fe300000 ... Image Name: Linux-2.4.23-pre6 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 500501 Bytes = 488.8 kB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK Uncompressing Kernel Image ... OK ## cmdline at 0x007FFC00 ... 0x007FFC2D memstart = 0x00000000 memsize = 0x02000000 flashstart = 0xFE020000 flashsize = 0x00800000 flashoffset = 0x0001F900 sramstart = 0x00000000 sramsize = 0x00000000 bootflags = 0x0000C2C1 intfreq = 100 MHz busfreq = 100 MHz ethaddr = 00:00:00:00:00:00 IP addr = 0.0.0.0 baudrate = 115200 bps ## Loading RAMDisk Image at fe500000 ... Image Name: Simple Embedded Linux Framework Image Type: PowerPC Linux RAMDisk Image (gzip compressed) Data Size: 1476478 Bytes = 1.4 MB Load Address: 00000000 Entry Point: 00000000Verifying Checksum ... OK Loading Ramdisk to 01e43000, end 01fab77e ... OK Linux version 2.4.23-pre6 (shamile@ws022.ecsi.ca) (gcc version 2.95.4 20010319 (prerelease/franzo/20011204)) #4 Tue Nov 11 15:37:30 EST 2003 Xilinx Virtex-II Pro port (C) 2002 MontaVista Software, Inc. (source@mvista.com)On node 0 totalpages: 8192 zone(0): 8192 pages. zone(1): 0 pages. zone(2): 0 pages. Kernel command line: console=ttyS0,115200 mem=32M root=/dev/ram rw Xilinx INTC #0 at 0xFEFE2FC0 mapped to 0xFDFFEFC0 Calibrating delay loop... 99.73 BogoMIPS Memory: 29664k available (912k kernel code, 304k data, 52k init, 0k highmem) Dentry cache hash table entries: 4096 (order: 3, 32768 bytes) Inode cache hash table entries: 2048 (order: 2, 16384 bytes) Mount cache hash table entries: 512 (order: 0, 4096 bytes) Buffer cache hash table entries: 1024 (order: 0, 4096 bytes) Page-cache hash table entries: 8192 (order: 3, 32768 bytes) POSIX conformance testing by UNIFIX Linux NET4.0 for Linux 2.4 Based upon Swansea University Computer Society NET3.039 Initializing RT netlink socket
Starting kswapd devfs: v1.12c (20020818) Richard Gooch (rgooch@atnf.csiro.au) devfs: boot_options: 0x1 pty: 256 Unix98 ptys configured Serial driver version 5.05c (2001-07-08) with no serial options enabled ttyS00 at 0xfdfff003 (irq = 31) is a 16450 RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize loop: loaded (max 8 devices) NET4: Linux TCP/IP 1.0 for NET4.0 IP Protocols: ICMP, UDP, TCP, IGMP IP: routing cache hash table of 512 buckets, 4Kbytes TCP: Hash tables configured (established 2048 bind 2048) NET4: Unix domain sockets 1.0/SMP for Linux NET4.0. RAMDISK: Compressed image found at block 0 Freeing initrd memory: 1441k freed VFS: Mounted root (ext2 filesystem). Mounted devfs on /dev Freeing unused kernel memory: 52k init serial console detected. Disabling virtual terminals. Oops: kernel access of bad area, sig: 11 NIP: C00297FC XER: 20000000 LR: C0029924 SP: C19BFB30 REGS: c19bfa80 TRAP: 0800 Not tainted MSR: 00009030 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11 DEAR: 00000608, ESR: 00000000 TASK = c19be000[12] 'xinetd' Last syscall: 12 last math 00000000 last altivec 00000000 GPR00: C0029924 C19BFB30 C19BE000 C1FE2500 0000035D 00000600 C19B6BFC 00000000 GPR08: 00000400 C0120000 0000307F 00001FFF 84000008 10043878 00000000 00000000 GPR16: 00000000 00000000 00000000 C01239B4 C0067970 00000000 C01239B4 C1FE2500 GPR24: 00000000 C01B9410 0000035D C01B8000 00000600 C1FE2500 0000035D 00000600 Call backtrace: C1FE2500 C0029924 C008B1FC C008B36C C0089650 C0089720 C003E294 C0067E04 C002929C C002930C C002B0D0 C0026420 C00265F8 C000EF4C C0004A28 C0046454 C0047BEC C0039444 C00047DC 10009390 100096C8 1000C130 0FD74D14 00000000 EXT2-fs error (device ramdisk(1,0)): ext2_check_page: bad entry in directory #2: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0 Oops: kernel access of bad area, sig: 11 NIP: C001EC20 XER: 00000000 LR: C001ECB0 SP: C0100E00 REGS: c0100d50 TRAP: 0800 Not tainted MSR: 00009030 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11 DEAR: 00000000, ESR: 00000000 TASK = c00ff030[0] 'swapper' Last syscall: 120 last math 00000000 last altivec 00000000 GPR00: 00000000 C0100E00 C00FF030 00000800 00001030 00000001 C0120000 C011A1E0 GPR08: 00000000 00000000 C011A1E0 C00FF030 42000000 10043878 01FFA600 00000000 GPR16: 007FFC2D 007FFC00 01FF581C 00000000 00001032 00100EF0 00000000 C0004A20 GPR24: C00060C4 00800000 C010C220 00000000 C0120000 00000001 00000000 00000001 Call backtrace: C001EC88 C001A7C4 C001A688 C001A2C0 C00062E8 C0004A20 C0024B90 C0006088 C00060B0 C000243C C010D5A4 C0002328 Kernel panic: Aiee, killing interrupt handler! In interrupt handler - not syncing <0>Rebooting in 180 seconds..
abatron trace ------------- #0 0xc00067cc in __delay () #1 0xc0014774 in panic (fmt=0x1cfde0 <Address 0x1cfde0 out of bounds>) at /home/shamile/ecsi-linux/kernel/src-linuxppc_2_4_devel/include/asm/delay.h:42 #2 0xc001897c in do_exit (code=11) at exit.c:430 #3 0xc0004bc4 in die (str=0xc00e60bc "kernel access of bad area", fp=0xc0100d50, err=11) at traps.c:109 #4 0xc000f1ac in bad_page_fault (regs=0xb, address=4144, sig=-1072799556) at fault.c:341 #5 0xc000f058 in do_page_fault (regs=0xc0100d50, address=0, error_code=0) at fault.c:288 #6 0xc0004a28 in ret_from_intercept () #7 0xc001ec88 in timer_bh () at timer.c:686 #8 0xc001a7c4 in bh_action (nr=49857) at softirq.c:299 #9 0xc001a688 in tasklet_hi_action (a=0xc2c1) at softirq.c:229 #10 0xc001a2c0 in do_softirq () at softirq.c:90 #11 0xc00062e8 in timer_interrupt (regs=0xc0100f00) at time.c:209 #12 0xc0004a20 in ret_from_fork () #13 0xc0024b90 in check_pgt_cache () at memory.c:138 #14 0xc0006088 in idled () at idle.c:68 #15 0xc00060b0 in cpu_idle () at idle.c:84 #16 0xc000243c in rest_init () at init/main.c:346 #17 0xc010d5a4 in start_kernel () at init/main.c:440 #18 0xc0002328 in start_here ()
Thanks, Shamile
--- Wolfgang Denk wd@denx.de wrote:
Hello,
in message 20031106213306.15958.qmail@web11609.mail.yahoo.com you wrote:
I tried pRamdisk for ppc_4xxFP and ppc_4xx. I am not
sure
of the difference between ppc_4xxFP and ppc_4xx. But
just a
heads up. With ppc_4xxFP, I get the same results as for
the
ppc_4xxFP is for PPC 4xx processors with floating point unit; your processor belongs not to this group.
All this is documented - please see the DULG (to be more precise, see the table at end of section 3.5 at http://www.denx.de/twiki/bin/view/DULG/ELDKUsage
With ppc_4xx, I get these messages
Freeing unused kernel memory: 52k init serial console detected. Disabling virtual terminals. Oops: kernel access of bad area, sig: 11 NIP: C00112C8 XER: 00000000 LR: C00112AC SP: C19CFF10
REGS:
c19cfe60 TRAP: 0800 Not tainted MSR: 00009030 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11 DEAR: 39600410, ESR: 00000000 TASK = c19ce000[12] 'xinetd' Last syscall: 3 last math 00000000 last altivec 00000000 GPR00: ED0001FE C19CFF10 C19CE000 00009030 00001030 C0101AE8 C1E44260 00000000 GPR08: C0101AE8 09B003ED C00F8030 396003F0 00000001 10043878 00000000 00000000 GPR16: 00000000 00000000 00000000 00000000 00001032 019CFF40 00000000 C00049E0 GPR24: C000608C 10024CB0 30025ACC 10025A48 C1E86000 C0104C80 00000000 C19CFF10 Call backtrace: 0EC82E3A C0004A04 10007570 10007614 10009714 1000C134 0FD74D14 00000000
Well, and which results did you get when decoding this call backtrace?
I also have a question concerning Linux debugging with abatron. I can set an instruction breakpoint (e.g at start_here in the kernel) when I use a zImage.elf image
but
zImage.elf is definitely not what you want to use. You have to use the vmlinux file in the kernel's top level directory.
the same breakpoint doesnt work when I use u-boot to
boot
vmlinux.PPCBoot image.
See
http://www.denx.de/twiki/bin/view/DULG/DebuggingLinuxKernel
Best regards,
Wolfgang Denk
-- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de You speak of courage. Obviously you do not know the difference bet- ween courage and foolhardiness. Always it is the brave ones who die, the soldiers. -- Kor, the Klingon Commander, "Errand of Mercy", stardate 3201.7
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