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List:       linux-arm-kernel
Subject:    initrd problem on CDB89712
From:       Lambert Duijst <l.duijst () scantech-id ! com>
Date:       2002-02-28 8:49:00
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Hi all,

I have a problem trying to set up linux-2.4.17rmk5 on my cdb89712. It is not 
able to mount the root filesystem. I use hermit 1.3 as downloader/bootloader 
to download my kernel to it. I believe that this works fine as I am able to 
download a kernel and a ramdisk to my cdb89712. I used this tool before with 
linux 2-4.6 and this worked o.k, I got a working linux with a working ramdisk.

I fiddled around with the size of the ramdisk image , I create the ramdisk 
like this :

dd if=/dev/zero of=ramdisk.img bs=1024 count=2048 (or 4096, tried several 
sizes)
mke2fs -N 500 ramdisk.img
mount -o loop ramdisk.img mnt

and then copy all I need to it.

when I choose the ramdisk to be 4096 blocks of 1024 bytes my kernel gives the 
message :
Kernel panic: VFS Unable to mount root fs on 01:00

and when the size of my ramdisk is 2048 I get this :

Entering terminal mode -- interrupt to exit

hermit> b
Uncompressing  kernel...................................done.
Uncompressing 
ramdisk.................................................................done.
Linux version 2.4.17-rmk5 (lambert@rbs_lambert) (gcc version 2.95.3 20010315 
(release)) #8 do feb 28 09:26:10 CET 2002

Processor: ARM ARM720T revision 2

Architecture: Cirrus-CDB89712

On node 0 totalpages: 8192

zone(0): 8192 pages.

zone(1): 0 pages.

zone(2): 0 pages.

Kernel command line: root=1f04 mem=32M 

Calibrating delay loop... 36.76 BogoMIPS

Memory: 32MB = 32MB total

Memory: 28912KB available (998K code, 210K data, 44K init)

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

JFFS version 1.0, (C) 1999, 2000  Axis Communications AB

ttyAM0 at I/O 0x100 (irq = 12) is a CLPS711x

ttyAM1 at I/O 0x1100 (irq = 28) is a CLPS711x

pty: 256 Unix98 ptys configured

block: 64 slots per queue, batch=16

RAMDISK driver initialized: 16 RAM disks of 2048K size 1024 blocksize

Cirrus CDB89712 MTD mappings:

  Flash 0x800000 at 0x0

  SRAM 0xc000 at 0x60000000

  BootROM 0x80 at 0x70000000

CFI: Found no flash device at location zero

FLASH probe failed

SRAM probe failed

BootROM probe failed

NET4: Linux TCP/IP 1.0 for NET4.0

IP Protocols: ICMP, UDP, TCP

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: ext2 filesystem found at block 0

RAMDISK: Loading 2048 blocks [1 disk] into ram disk... 
> /-\|/-\|/-\|/-\|/-\|/-\|/-\|/-\|/-\|/-\|/- \
> \|/-\|/-\|/-\|/-\|/-\|/-\|/-\|/-\|/-\|/-\| \
> /-\|/-\|/-\|/-\|/-\|/-\|/-\|/-\|/-\|/-\|/-\done.
> 

Freeing initrd memory: 2048K

Unable to handle kernel paging request at virtual address c2000000

pgd = c0024000

*pgd = 00000000, *pmd = 00000000

Internal error: Oops: 0

CPU: 0

pc : [<c0114de0>]    lr : [<c002c540>]    Not tainted

sp : c000bf04  ip : 00000000  fp : c000bf1c

r10: c1fee000  r9 : 41807202  r8 : c013eaa0

r7 : 00000000  r6 : 00000000  r5 : c1fee000  r4 : c1fee000

r3 : 00000000  r2 : 0000001a  r1 : 0000000a  r0 : c2000000

Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  Segment kernel

Control: 217F  Table: C002401D  DAC: 0000001D

Process swapper (pid: 1, stackpage=c000b000)

Stack: (0xc000bef4 to 0xc000c000)

bee0:                                              c002c540 c0114de0 
20000013 

bf00: ffffffff c0136a2c c01499ac c0148d4c c000bfb4 c000bf20 c002c5c0 
c002c4d8 

bf20: 00000000 c013aeec 00000000 c011bc90 00000001 00200000 00000000 
00000000 

bf40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000 

bf60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
c0136a2c 

bf80: c013aec4 c0148d4c 00000000 c0136a2c c013aec4 c0148d4c 00000000 
c013eaa0 

bfa0: 41807202 c003175c c000bfdc c000bfb8 c0033148 c002c590 00002000 
00002000 

bfc0: c015e6d4 c013eeb4 c013eeb0 c0136c48 c000bffc c000bfe0 c0033244 
c00330e0 

bfe0: 00002000 c015e6d4 c013eeb4 c013eeb0 00000000 c000c000 c0034ce0 
c0033240 

Backtrace: 

Function entered at [<c002c4c8>] from [<c002c5c0>]

 r6 = C0148D4C  r5 = C01499AC  r4 = C0136A2C 

Function entered at [<c002c580>] from [<c0033148>]

Function entered at [<c00330d0>] from [<c0033244>]

 r8 = C0136C48  r7 = C013EEB0  r6 = C013EEB4  r5 = C015E6D4

 r4 = 00002000 

Function entered at [<c0033230>] from [<c0034ce0>]

 r7 = C013EEB0  r6 = C013EEB4  r5 = C015E6D4  r4 = 00002000

Code: 00000000 00000000 (e4d02001) e1320001 13320000 

Kernel panic: Attempted to kill init!

The reason why I think my kernel expects a ramdisk of the size 2048 is the 
line:

Freeing initrd memory: 2048K

But isn't this also the reason why it crashes ? I mean doesn't the kernel 
need it's ramdisk image instead of freeing it ?

Can anyone help me with this please, I already searched the archives and I 
saw a lot of problems like the one above so I'll go and try some solutions , 
but I would also like the opinion of people who know this problem.

I read in the archives about keep initrd, what is this about ?

Thanks,

Lambert Duijst



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