[linuxsh-dev] Ramdisk

[Studencki (e. P. <Paw...@er...>]

Hello,

I have again :) problem with my RAM disk... I think it's hte problem with
memory allocation... I was using 2 MB RAM disk with mem=16 MB, than I've
made 4 MB disk and this kernel messages:

===================================
Linux version 2.3.99-pre7 (root@capella) (gcc version 2.95.2 19991024
(release))
 #182 Wed Jun 21 11:56:49 MEST 2000
On node 0 totalpages: 4096
zone(0): 4096 pages.
zone(1): 0 pages.
zone(2): 0 pages.
SH RTC: invalid value, resetting to 1 Jan 2000
CPU clock: 75.18MHz
Module clock: 75.18MHz
Interval = 187973
Calibrating delay loop... 149.91 BogoMIPS
Memory: 11304k/16384k available (496k kernel code, 5080k reserved, 31k data,
20k
 init)
Dentry-cache hash table entries: 2048 (order: 2, 16384 bytes)
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 4096 (order: 2, 16384 bytes)
kmem_create: Poisoning requested, but con given - bdev_cache
Inode-cache hash table entries: 1024 (order: 1, 8192 bytes)
kmem_create: Poisoning requested, but con given - inode_cache
CPU: SH7708/SH7709
POSIX conformance testing by UNIFIX
Linux NET4.0 for Linux 2.3
Based upon Swansea University Computer Society NET3.039
kmem_create: Poisoning requested, but con given - skbuff_head_cache
Starting kswapd v1.6
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
RAMDISK: ext2 filesystem found at block 0
RAMDISK: Loading 4096 blocks [1 disk] into ram disk... <1>Unable to handle
kerne
l NULL pointer dereference at virtual address 00000000
pc = 8c00d842
Oops: 0001

PC  : 8c00d842 SP  : 8c1fbb20 SR  : 400001f1 TEA : 00000000
R0  : 400001f1 R1  : 00000000 R2  : 40000101 R3  : 8c1fbb34
R4  : 00000000 R5  : 00000000 R6  : 8c07fb14 R7  : 00000000
R8  : 00000000 R9  : 00000001 R10 : 00000400 R11 : 8ce8faa0
R12 : 8c1fa000 R13 : 8c081a3c R14 : 8c1fbb20
MACH: 03a8fdc2 MACL: 0001aae0 GBR : ffffffff PR  : 8c02a8a0
====================================================================

this problem is similar to problem Yutarou Ebihara (function
wake_up_process, kernel is trying to use wrong RAM area ?) I have the same
problem with smaller RAM disk at mem=4 or 8 MB, so I think, it depends on
memory allocation...)
Has somebody same problems with bigger RAM disks ?
How much space does kernel need ? 
I'm using Ludovic's Loader. Kernel Start in RAM is 0x8c001000 and initrd
starts in RAM at 0x8c800000, I left enough space for Kernel ?

thanks for any suggestions

Regards
Pawel