jffs2 root filesystem

hi

I try to port linux-2.4.19-rmk1 to a pxa255 board
i am success to use MTD partition and can mount it
But when i try to use MTD as root filesystem (root=/dev/mtdblock/3 console=ttyS0,38400)
kernel boot message show:

.......
physmap flash device: 2000000 at 0
cfi_cmdset_0001: Erase suspend on write enabled
Using buffer write method
mtd: Giving out device 0 to Physically mapped flash
MTD partition setup...
partition num: 4
Using physmap partition definition
Creating 4 MTD partitions on "Physically mapped flash":
0x00000000-0x00040000 : "U-boot"
mtd: Giving out device 1 to U-boot
0x00040000-0x00340000 : "zImage"
mtd: Giving out device 2 to zImage
0x00340000-0x00a00000 : "ramdisk"
mtd: Giving out device 3 to ramdisk
0x00a00000-0x02000000 : "User system"
mtd: Giving out device 4 to User system
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 2048 bind 4096)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0. NetWinder Floating Point Emulator V0.97 (double precision) mtdblock_open
ok
mtdblock: read on "Physically mapped flash" at 0x400, size 0x400 mtdblock_release
ok
mtdblock_open
ok
mtdblock: read on "Physically mapped flash" at 0x0, size 0x200
FAT: bogus logical sector size 5349
mtdblock_release
ok
mtdblock_open
ok
mtdblock: read on "Physically mapped flash" at 0x0, size 0x200
FAT: bogus logical sector size 5349
mtdblock_release
ok
mtdblock_open
ok
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000000:
0x0016 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000004:
0xf014 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000008:
0xf014 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000000c:
0xf014 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000010:
0xf014 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000014:
0xf014 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000018:
0xf014 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000001c:
0xf014 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000020:
0x0160 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000024:
0x01c0 instead
Further such events for this erase block will not be printed
JFFS2: Erase block at 0x00000000 is not formatted. It will be erased
VFS: Mounted root (jffs2 filesystem) readonly.
Freeing init memory: 64K
Warning: unable to open an initial console.

Kernel panic: No init found. Try passing init= option to kernel.

..................

why can't i use mtd as my root disk

Sam

This is wierd. I wonder if it's trying to mount it as a FAT filesystem first. Most people usually include 'rootfstype=jffs2' in the command line.

I think there's mention of this in the mailing list. Can you try searching the archives and see what this indicates?

It looks like you ARE using MTD for your root disk. I usually get this "unable to open an initial console" warning / error when the device file /dev/console doesn't exist. Perhaps the above error is messing up the root filesystem.

BTW, have you tried booting off a ramdisk and manually mounting that partition? That should clear up most of the issues that you'd run into, but it's much easier to debug.

I hope this makes sense and that it helps.

Mike

Try using /dev/mtdblock3.

And is the flash really mapped at 0x00000000?

Jeff Angielski
The PTR Group