[U-Boot-Users] Help required to bring up kernel from U-Boot

Wolfgang Denk wd at denx.de
Fri Dec 16 11:11:01 CET 2005

In message <OFB8CF31AB.E132BC0B-ON652570D9.001789DD-652570D9.001A8A99 at tcs.com> you wrote:
> I copied uImage to location 0x04000000 and  the Load Address=0x00000000 
> and Entry point=0x00000000.  The bootm 0x04000000 gives the o/p 
> "Transferring Control to Linux" and then nothing comes. Where is the 
> wrong?

This is a FAQ. Please see http://www.denx.de/wiki/DULG/Faq

> 1. What are the minimum information Linux needs from U-Boot to come up 
> properly?  In the Linux source tree we have put some printk statement and 
> found that base address of SDRAM, size, etc are passed correctly to Linux 
> by U-Boot. 

Be careful with printk() at inappropieate places (i.e. too early).

But tell me - how where you  able  to  see  anthing  with  printk  if
"nothing comes" as you write above ???

> 2. Is the info passed from U-Boot is sufficient enough to make the kernel 
> up?

Yes, of course. It works on thousands of systems.

> 3. If not, where should I concentrate in Linux tree?

On your changes.

And please keep this off the U-Boot list. It is off topic here.

Best regards,

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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