[U-Boot-Users] U-Boot success .. Linux big test

Wolfgang Denk wd at denx.de
Wed Nov 19 01:08:23 CET 2003

Dear Sharad Gupta,

in message <Pine.GSO.4.58.0311181720580.29702 at buckeye.ece.drexel.edu> you wrote:
> I have been able to port U-Boot to our bare minimum custom board based on
> MPC7455. With RS-232 the only peripheral to speak of, it was not a hard


> But now the big test for me is to run kernel on top of U-Boot. Looking at
> u-boot README, I compared the u-boot.h file with linux's
> include/asm/ppcboot.h. The only difference is the member bi_mon_func. I am
> not able to find out if I have to replicate the same structure of monitor
> functions in U-Boot to be passed to kernel on boot or is it handled

Simply forget these function pointers.  They  are  a  left-over  from
earlier versions of PPCboot and not used any more.

> the execution hangs somewhere after handling the control to kernel at 0x00
> and it seems my only hope is to put little debug messages (light up the 4
> LEDs on board with the last 2-bytes of instruction address) at every
> function call.

See http://www.denx.de/twiki/bin/view/DULG/LinuxHangsAfterUncompressingKernel

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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