Re: [axfs-developer] bugreport: axfs mouting problem

[Will M. <wjm...@gm...>]

Andre Puschmann wrote:
> Hi list,
>
> I am using kernel 2.6.21 and I am trying to use axfs as my root filesystem.
> If I try to boot the kernel with this command line:
> "console=ttyS0,115200n8 rootfstype=axfs root=1f03"
>
> .. I get the following error (some debug messages added):
>
> <log>
> [    1.210000] XScale iWMMXt coprocessor detected.
> [    1.220000] fsoffset is 0x0
> [    1.220000] sbi->mmap_size is 0x1
> [    1.220000] fsoffset > sbi->mmap_size
> [    1.230000] 5 call axfs_copy_mem*sbi: C02F9000
> [    1.230000] offset: 1
> [    1.230000] *sbi: C02F9000
> [    1.240000] offset: 1
> [    1.240000] *virt_start_addr: 0
> [    1.240000] addr: 0
> [    1.240000] Unable to handle kernel NULL pointer dereference at 
> virtual address 00000000
> [    1.250000] pgd = c0004000
> [    1.260000] [00000000] *pgd=00000000
> [    1.260000] Internal error: Oops: f5 [#1]
> [    1.260000] Modules linked in:
> [    1.260000] CPU: 0
> [    1.260000] PC is at memcpy+0x48/0x330
> [    1.260000] LR is at axfs_copy_mem+0x90/0xa8
> [    1.260000] pc : [<c00e2668>]    lr : [<c00a6d98>]    Not tainted
> [    1.260000] sp : c02d3acc  ip : 00000000  fp : c02d3b14
> [    1.260000] r10: c01cc5b8  r9 : c03739c0  r8 : c01cc5a8
> </log>
>
> If I use the physaddr-flag, I can successfully mount the image:
> "console=ttyS0,115200n8 rootfstype=axfs rootflags=physaddr=0x360000"
>
> <log>
> [    1.220000] VFS: Unable to mount root fs via NFS, trying floppy.
> [    1.230000] 1 call axfs_copy_mem*sbi: C02F9000
> [    1.230000] offset: 1
> [    1.240000] *sbi: C02F9000
> [    1.240000] offset: 1
> [    1.240000] *virt_start_addr: C4C10000
> [    1.250000] addr: C4C10000
> [    1.250000] fsoffset is 0x0
> [    1.250000] sbi->mmap_size is 0x1
> [    1.250000] fsoffset < sbi->mmap_size
> [    1.260000] 2 call axfs_copy_mem*sbi: C02F9000
> [    1.260000] offset: 1
> [    1.260000] *sbi: C02F9000
> [    1.270000] offset: 1
> [    1.270000] *virt_start_addr: C4C10000
> [    1.270000] addr: C4C100FC
> [    1.280000] fsoffset is 0x0
> </log>
>
> The strange thing, as you can see in the first log, is line two to four.
>
>
> Best regards,
> Andre
>
>
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>   
Andre,

Thanks for the report, I'll look into that shortly. Before that, have 
you tried using a root parameter along the lines of:

root=mtdX

where X is the number of your mtd device? Don't include /dev/ on that, 
it's omitted intentionally.