fail to mount MTD (NAND) as root file system

fail to mount MTD (NAND) as root file system

[Taeil Um]

I succeeded to access and mount NAND flash (JFFS2 on MTD).
But is was not a root file system.

When i tried mount the NAND flash as a root file system, i succeeded for the first time.

But if i reboot the system and mount NAND flash as a root file system again,
i got a KERNEL-OOPS as bellow
-----------------------------------------------------------------------------------------------------------------
VFS: Mounted root (ext2 filesystem).
VFS: Mounted root (jffs2 filesystem).
Unable to handle kernel NULL pointer dereference at virtual address 00000003
pgd = c0024000
*pgd = 00000000, *pmd = 00000000
Internal error: Oops: ffffffff
CPU: 0
pc : [<c0055668>]    lr : [<c0006000>]    Not tainted
sp : c001fe6c  ip : ffffffff  fp : c001fe88
r10: c1d41000  r9 : c017274c  r8 : 00000003
r7 : 60000013  r6 : c020f218  r5 : 000001f0  r4 : c020f210
r3 : ffffffff  r2 : ffffffff  r1 : ffffffff  r0 : ffffffbf
------------------------------------------------------------------

And the jffs2 file systems are corrupted on NAND flash.
Does anybody have same experience?

Followings are my system spec.
	CPU : EP7312
	SDRAM : 32M
	NOR FLASH : 8M
	NAND FLASH : 16M (samsung 16bit NAND flash)
	Kernel : 2.4.18-rmk6
	MTD patch : 2002.11.29 from MTD CVS
	Cross Compiler : arm-linux (2.95.3)






Thanks all !

Re: fail to mount MTD (NAND) as root file system

[Thomas Gleixner]

On Wednesday 04 December 2002 14:54, Taeil Um wrote:
> When i tried mount the NAND flash as a root file system, i succeeded for
> the first time.
 
> But if i reboot the system and mount NAND flash as a root file system
> again,
 i got a KERNEL-OOPS as bellow
> VFS: Mounted root (ext2 filesystem).
> VFS: Mounted root (jffs2 filesystem).
> Unable to handle kernel NULL pointer dereference at virtual address
> 00000003
 pgd = c0024000
> *pgd = 00000000, *pmd = 00000000
> Internal error: Oops: ffffffff
> CPU: 0
> pc : [<c0055668>]    lr : [<c0006000>]    Not tainted
> sp : c001fe6c  ip : ffffffff  fp : c001fe88
> r10: c1d41000  r9 : c017274c  r8 : 00000003
> r7 : 60000013  r6 : c020f218  r5 : 000001f0  r4 : c020f210
> r3 : ffffffff  r2 : ffffffff  r1 : ffffffff  r0 : ffffffbf
> ------------------------------------------------------------------
> 
Please recompile your kernel with debugging enabled and provide a stacktrace 
through ksymoops.

-- 
Thomas
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