RE: [PPCBoot-users] loads usage on a windows platform

[Debbie Xu <DX...@in...>]

Hi Prakash and Wolfgang,

I had exactly the same problem as Prakash. And now I hit the same wall as
Prakash. The kernel took over the control from ppcboot, but it never printed
out anything and went on forever. I found the kernel started at _start, then
broke when doing memset() in the early_init() function in
arch/ppc/kernel/setup.c. However, the range to be initialized at memset() is
from __bss_start to _end, and these two values are set automatically in the
arch/ppc/Makefile. I have no way to modify the values at all.

Is Prakash having the same problem? Anybody have an idea how this
memset(__bss_start, 0, _end-__bss_start) could go wrong?

Thanks,
Debbie

-----Original Message-----
From: Wolfgang Denk [mailto:wd...@de...] 
Sent: Thursday, December 26, 2002 4:18 PM
To: Prakash kanthi
Cc: ppc...@li...
Subject: Re: [PPCBoot-users] loads usage on a windows platform 

In message <200...@we...> you wrote:
> Great! I used kermit itself to download the image and
> it worked. Now i can do imi and get valid information.

Fine. It's always best to use real tools instead of M$ crippleware.

> But when i try to do 'bootm 0x00400000', it verifies
> the checksum successfully, prints board info structs,
> prints that there is no Initrd and finally a message
> saying that control is transferred to 0x0. After that
> it just stops there forever. 

Well, you now enter the next stage of debuffing - that of  the  Linux
kernel (which is more or less off topic here).

> I went thru cmd_bootm.c and saw that, the control is
> shipped to 0x0 with four params (bd info,
> initrd_start, initrd_end, cmd_start and cmd_end).
> Which function is it calling in linux code?

It enters the Linux kernel at the entry point, _start

> start_kernel in linux code does not take four params.

start_kernel is much, much later.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd...@de...
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like.                                               - Abraham Lincoln


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