Help with using JFFS2 as root filesystem

Hi all,

I have been trying to get the JFFS2 working on Linux kernel 2.4.20
that is implemented on ppc. I have used Ramdisk based filesystem with
no problem. However, I need a filesystem that can preserve all changes
after reboot. I have problem with configuring the kernel to enable the
support for JFFS2. I have enabled the following options on the kernel
configuration:
- Memory Technology Device (MTD) support
- Debugging (debugging verbosity = 3)
- MTD partitioning support
- Command line partition table parsing
- Direct char device access to MTD devices
- Caching block device access to MTD devices
- NFTL support (write support to NFTL)
- RAM/ROM/Flash chip device:
Detect Flash chip by CFI probe
Support for AMD/Fujitsu flash chips
I also modified the Initial Kernel command string to:
- console=ttl0,9600 noinitrd rw ip=off root=/dev/mtdblock3
rootfstype=jffs2

I re-compiled the kernel, programmed it to flash. I still use the same
ramdisk image that I use for ramdisk-based filesystem. After Linux is
started on the board, I can see the following nodes being created:
/dev/mtd
/dev/mtdblock
, and the following entry in /proc:
/proc/mtd
When I did # cat /proc/mtd, the partition list was empty. I know it's
supposed to show where the bootloader, kernel, and filesystem is
mounted on /dev/mtd*. I programmed the files for bootloader, kernel,
and filesystem to specific Flash locations separately by using Xilinx
XPS. By now, I have only enabled the support of JFFS2 filesystem on
the kernel. Is there any extra steps I should do to configure the
partition? I expected that the /dev/mtdblock0, /dev/mtdblock1, etc,
are created automatically once I enabled the support, but apparently
they didn't. What did I do wrong? Any suggestion will be greatly
appreciated. Thanks.


Shirley

.

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