Re: rootfs as JFFS2 on AT91SAM9260

["Michel Benoit" <murpme@xxxxxxxxx>]

> > I followed Ulf Samuelsson's advices but I don't know which options I should use
> > to configure the linux kernel.
> > I included JFFS2, SPI/Dataflash but what about CONFIG_MTD_PHYSMAP options?
> > My .config file is here: http://nbrouard.free.fr/.config
> >
> > I use U-Boot to flash my roofs.arm.jffs2 at 0xD0528000 and I launch the kernel
> > with the following command line:
> > mem=64M console=ttyS0,115200 initrd=$diskAddr,$diskSize \
> > root=/dev/mtdblock6 rw rootfstype=jffs2 Which mtdblock device should be used?
> >
> > The console output when I start the board is here: http://nbrouard.free.fr/output
> >
> > Thanks
>
> Looks like your MACB Ethernet  driver crashes.
>
> The maxim.org.za patches is not enough to get things running
> Apply the "experimental linux project" patches from www.at91.com
>
> Build your root file system, using buildroot which configures the root file system
> for JFFS2 using the right parameters (I hope).
>
> I think mtdblock6 is a bit high.
> IIRC, I have used mtdblock2 in the past.

The number of the mtd block device does not matter, as long as its an
mtd partition that you defined in board-at91sam9260ek.  The important
thing is that /dev/mtdblockX exists.

Here is how I build a jffs2 filesystem on the NAND

Create a JFFS2 file system on the host
> mkfs.jffs2 -o userfs.jffs2 -e 0x20000 -s 0x800 -d ./userfs -l -v -p
> sumtool -i userfs.jffs2 -o userfs_sum.jffs2 -e 0x20000 -p

Copy JFFS2 file system to the user partition
> flash_eraseall -j /dev/mtd3
> nandwrite -q /dev/mtd5 userfs_sum.jffs2
> mount -t jffs2 mtd5 /mnt/flash -o sync

This requires that you enable sumtool in your linux kernel.
If you want to use the jffs2 as rootfs then you need to supply the
following bootargs

mem=32M console=ttyS0,115200 root=/dev/mtdblock5 ro rootfstype=jffs2 debug

This assumes that you have a valid rootfs programmed into mtd5
(rootfs.arm.jffs2 from buildroot).  You have both an initrd and a
jffs2 rootfs in your bootargs.  That may explain why it is not
working.

Hope this helps,

Michel

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