I am working on AT91SAM9260EK board
and NAND flash

I have some very basic doubts ....
i configured the buildroot using menuconfig/xconfig and was able to compile.
In the output images, i have
uImage ( compressed linux kernel ) and root.jffs2

i have already flashed the at91bootstrap and uboot to the NAND flash at respective address.
( readymade binaries from at91.com/)

i flash the root.jffs2 to the NAND at the 0x400000

i) When i boot the system, i get
U-Boot> Wrong Image Format for bootm command
Unknown command 'Wrong' - try 'help'

ii) Also tried
setenv bootargs 'mem=64M console=ttyS0,115200 root=/dev/mtdblock1 rw rootfstype=jffs2'
But same error
Wrong Image Format for bootm command
ERROR: can't get kernel image!

iii) In the Buildroot demo, there are
binaries of Linux Kernel, Boot-Env
Uboot and at91Bootstrap and also .jffs2.

Q) What all exactly does the .jffs2 image contain ?

Q) Do i need to generate binary file of the linux kernel ? If yes, how ?

Q) How do i use the uImage compressed linux kernel ?

Q) How would fresh binaries of Bootstrap and Uboot get generated after i choose them in the menuconfig ?

Whats really missing ?

Thanks a lot in advance,
AbhiAsh

You can start from debugging bootm value from uboot prompt.


It contains the root filesystem with everything you configured using menuconfig/xconfig.


It is uImage and you have already generated it.



As with most cases - statement of what exactly are you trying to achieve

Hi Kait,

Thanks for your reply.
I flashed the uImage at 0x200000
and root.jffs2 at 0x400000
Also the uboot, uboot.env at 0x20000 and 0x60000 from the demo.

The uImage was corrupted while FTP transfer. Now it goes a step ahead but the CPU stalls at errors

VFS: Cannot open root device "mtd0" or unknown-block(0,0)

also with dev/mtdblock0 setting, i get the same error

Fot info:
bootcmd=nand read 0x22200000 0x00200000 0x00168CF8; bootm 0x22200000

I also made the mentioned changes in the
_defconfig file for NAND ...

CONFIG_MTD=y
CONFIG_MTD_PARTITIONS=y
CONFIG_MTD_CHAR=y
CONFIG_MTD_BLOCK=y
CONFIG_MTD_NAND=y
CONFIG_MTD_NAND_YOURBOARD=y
CONFIG_JFFS2_FS=y
CONFIG_JFFS2_FS_DEBUG=0
CONFIG_JFFS2_FS_NAND=y

I cannot find my way out ....
If any idea, then do let me know

Thanks a lot.
abhiash