[U-Boot-Users] Re: How to pause u-boot after serial init

Nishant Galange nishant.subs at myrealbox.com
Fri Jan 7 03:58:12 CET 2005

The exact situation: 

console_init_f() executes properly.
Execution stops at printf() inside display_options().

hang() kept _after_ display_options() is never reached. Even if hang() is removed, the problem remains. 

Execution stops (as expected) at hang() if it is placed before display_options().

Hope that explained the problem.


Ps. SDRAM is not yet initialized at this point. Could that be the cause? Is it necessary to see any statements on the serial console?

-----Original Message-----
From: Wolfgang Denk <wd at denx.de>
To: "Nishant Galange" <nishant.subs at myrealbox.com>
Date: Thu, 06 Jan 2005 18:15:41 +0100
Subject: Re: [U-Boot-Users] How to pause u-boot after serial init 

In message <1105027245.41d677cnishant.subs at myrealbox.com> you wrote:
> I have a query regarding my custom board (8266 based PMC card, 512K boot fl
> ash, Himem (top boot), 32 MB main flash,  128 MB SDRAM, u-boot 1.1.1).
> Will you please use a shorter linelength, say 70 characters or so  as
> suggested by the netiquette? Thanks.
> When trying to bring up the serial port, I want to stop execution after ser
> ial initialization. So, I inserted an infinite loop ('hang') in init_sequ
> ence[] in lib_ppc/board.c. 

I don't understand what this would be good for,  but  if  you  really
want to do this...

> The problem is that a 'hang' placed just after console_init_f works but I c
> an't see any display on Hype Terrminal, because no prints have happened y
> et.

That's what you asked for...

> And a 'hang' placed after 'display options' dosen't even load! The data lin
> es (seen on a Logic Analyzer) show all 0s

What do you mean by "does not load"? And which  data  lines  are  you
talking about, and when do you sample these data lines?

> Can anybody please shed some light on this problem? Any help / hints will b
> e greatly appreciated.

I have no idea what you're trying to do, but attaching a BDI2000  and
running  the  code  under GDB is probably the fastest way to find out
what's going on on your system.

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
An armed society is a polite society.

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