How to create uImage using Yocto build system

Hi Biser,

I believe this question is generic. It is not depends on any kernel version. IF you answer me for 2.6.37 is more than sufficient

Thanks,

P.Ashok 

Merging this into existing thread. Please do not double-post.

Hi ,

Please let me know how to create uImage from zImage for AM3517evm.

I tried to convert the zImage to uImage using the following command

mkimage -A arm -O linux -T kernel -C gzip -a 80200000 -e 80200000 -n myuImage -d zImage uImage

But uboot is not loading this uImage file, Below is the errors from uboot promt 

Error:

Uncompressing Kernel Image ... Error: Bad gzipped data
GUNZIP: uncompress, out-of-mem or overwrite error - must RESET board to recover

Thanks,

P.Ashok

ASHOK palaniswamy said:

mkimage -A arm -O linux -T kernel -C gzip -a 80200000 -e 80200000 -n myuImage -d zImage uImage

Ashok, try to pass "none" argument after the -C flag (no compression) as the zImage you use to create the uImage is already compressed.

Best regards,
Miroslav

I believe U-boot by default expects zImage so I would double check to see if U-boot is using bootz when it is trying to boot up the kernel image. If so then that could be the probably since bootz is meant for zImages. I believe bootm is used for uImages.

I haven't used the Yocto distribution but in meta-ti we set the KERNEL_IMAGETYPE variable for all the different machines and that variable specifies what OE builds. So if you wanted it to build a uImage then you would set KERNEL_IMAGETYPE = "uImage". This change would be done in the machine configuration file for the board your building.