BOOT PROBLEMS WITH KERNEL 2.2.5 FOR MBX821

BOOT PROBLEMS WITH KERNEL 2.2.5 FOR MBX821

[Neil Blackwood]

I have  download  and built kernel 2.2.5 for MBX821 from the embeded ftp
site , but am now having problems with the kernel booting.

I have used mbx_defconfig, is this correct?

The following is a printout of the boot sequence, can anyone help, or at
least point me in the right direction as regards debugging.


Copyright Motorola Inc. 1988-1998, All Rights Reserved

MBX Debugger/Diagnostics Release Version 1.4 - 04/01/98 RM01
COLD Start

Local Memory Found =01000000 (&16777216)

MPU Clock Speed =40Mhz

WARNING: Keyboard Not Connected

WARNING: Low Battery Status - On_Board Battery

EPPC-Bug>pl 20 0
Network Booting from: MPC860, Controller 20, Device 0
Loading: /sys/mbxroot/zImage

Client IP Address      = 192.168.1.11
Server IP Address      = 192.168.1.10
Gateway IP Address     = 0.0.0.0
Subnet IP Address Mask = 255.255.255.0
Boot File Name         = /sys/mbxroot/zImage
Argument File Name     =

Bytes Received =&522979, Bytes Loaded =&522979
Bytes/Second   =&174326, Elapsed Time =3 Second(s)
loaded at:     00210000 001FD0D0
relocated to:  00100000 000ED0D0
board data at: 00FF4558 00FF4580
relocated to:  00200100 00200128
zimage at:     00217000 0027E052
avail ram:     0027F000 00FF5000

Linux/PPC load:
Uncompressing Linux...done.
Now booting the kernel
Linux version 2.2.5 (root@mbxdev) (gcc version egcs-2.91.60 19981201
(egcs-1.1.1 release)) #29 Mon Aug 16 14:33:56 GMT 1999
Boot arguments: root=/dev/nfs
time_init: decrementer frequency = 150000000/60
Calibrating delay loop... 39.83 BogoMIPS
Memory: 15144k available (728k kernel code, 468k data, 44k init)
[c0000000,c1000000]
POSIX conformance testing by UNIFIX
PCI: Probing PCI hardware
Linux NET4.0 for Linux 2.2
Based upon Swansea University Computer Society NET3.039
NET4: Unix domain sockets 1.0 for Linux NET4.0.
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
Starting kswapd v 1.5
NIP: 00000000 XER: 00000000 LR: C00E3D68 REGS: c013ddf0 TRAP: 0400
MSR: 08209032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
TASK = c013c000[1] 'swapper' mm->pgd c00cb000 Last syscall: 120
last math 00000000
GPR00: 00000000 C013DEA0 C013C000 00000000 C00C5F29 C00D79C0 C00F4918
00000000
GPR08: 00000000 C00E0000 00000000 C0100000 5CC38473 00000000 00000000
00000000
GPR16: 00000000 00000000 00000000 00000000 00000000 00FF4558 00000000
00000000
GPR24: 00000000 00000000 00000000 0020000D 00000005 C00F4858 00000001
C00F46D0
Call backtrace:
C00F4858 C00E3AF0 C00E3B5C C00E2AB8 C00DD760 C0002A04 C0006B28
Instruction DUMP:
Kernel panic: kernel access of bad area pc 0 lr c00e3d68 address 0 tsk
swapper/1
Rebooting in 180 seconds..
------------------------------------------------------
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Re: BOOT PROBLEMS WITH KERNEL 2.2.5 FOR MBX821

[Adrian Cox]

Neil Blackwood wrote:
> NIP: 00000000 XER: 00000000 LR: C00E3D68 REGS: c013ddf0 TRAP: 0400
> MSR: 08209032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
> TASK = c013c000[1] 'swapper' mm->pgd c00cb000 Last syscall: 120
> last math 00000000

Find out what function contains address 0xc00e3d68 by looking in the
System.map file. It's probably something board specific, as generic
Linux kernel code normally ends up at lower addresses. Then, try and
work out why it has made a call through a NULL function pointer.  The
important information for you is NIP for the instruction address and LR
for the address the last subroutine call came from.

- Adrian Cox, AG Electronics

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