root@ipaq214:~# cat /proc/mtd 
dev:    size   erasesize  name
mtd0: 00021000 00020000 "Unknown0"
mtd1: 00010000 00020000 "OBM1"
mtd2: 0000f000 00020000 "OBM2"
mtd3: 00040000 00020000 "U-Boot"
mtd4: 00400000 00020000 "Kernel"
mtd5: 0ec00000 00020000 "RootFS"
mtd6: 00c00000 00020000 "test"
mtd7: 00380000 00020000 "Unknown2"


root@ipaq214:~# flash_eraseall /dev/mtd3
Erasing 128 Kibyte @ 40000 -- 100 % complete.

root@ipaq214:~# flash_eraseall /dev/mtd4
Erasing 128 Kibyte @ 400000 -- 100 % complete.

root@ipaq214:~# dd if=/media/mmcblk0p1/bldiag.nb0 of=/dev/mtdblock3 bs=2048 count=128
91+1 records in
91+1 records out

root@ipaq214:~# dd if=/media/mmcblk0p1/uImage-ipaq214.bin of=/dev/mtdblock4 bs=2048 count=2048 
1135+1 records in
1135+1 records out