[U-Boot-Users] uImage wrapper removal?

[U-Boot-Users] uImage wrapper removal?

[Tom Guilliams]

Does anyone know if there's a utility to remove the U-Boot wrapper from 
a uImage  (gzipped kernel, etc)?  I'm creating a single uImage with 
kernel and ramdisk and I need to extract the kernel, replace the ramdisk 
and put it all back together after my Linux kernel has booted.  I 
believe objcopy will allow me to extract the kernel from kernel/ramdisk 
ELF image but that's off-topic.

Just checking to see if there's something already out there of if this 
has been discussed before.

Thanks,

Tom

[U-Boot-Users] uImage wrapper removal?

[Marc Singer]

Something along the lines of this

  dd if=uImage of=zImage bs=64 skip=1

The header is the first 64 bytes.

On Thu, Aug 14, 2003 at 09:34:57PM -0700, Tom Guilliams wrote:
> Does anyone know if there's a utility to remove the U-Boot wrapper from 
> a uImage  (gzipped kernel, etc)?  I'm creating a single uImage with 
> kernel and ramdisk and I need to extract the kernel, replace the ramdisk 
> and put it all back together after my Linux kernel has booted.  I 
> believe objcopy will allow me to extract the kernel from kernel/ramdisk 
> ELF image but that's off-topic.
> 
> Just checking to see if there's something already out there of if this 
> has been discussed before.

[U-Boot-Users] uImage wrapper removal?

[Wolfgang Denk]

In message <3F3C62F1.8060509@san.rr.com> you wrote:
> Does anyone know if there's a utility to remove the U-Boot wrapper from 
> a uImage  (gzipped kernel, etc)?  I'm creating a single uImage with 

U-Boot just prepends a 64 byte header (see include/image.h).

So "dd if=uImage of=kernel bs=64 skip=1" will do the job, as will
"tail -c +65 uImage >kernel".

> Just checking to see if there's something already out there of if this 
> has been discussed before.

No need for special tools. Just use the  standard  Unix  toolbox  for
file manipulation commands.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
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who  really  run organizations are usually found several levels down,
where it's still possible to get things done.
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