[U-Boot-Users] [PATCH] fix the ARM memory layout

Woodruff, Richard r-woodruff2 at ti.com
Mon Jan 19 19:08:14 CET 2004


I just applied this patch to my ARM board, and it seems to mostly work.
Prior to the memory change I would get stack dumps on aborts, since applying
the patch I am unable to get on to print.  Have you been able to generate
one?  I hook up the JTAG and do a little tracing...

One other comment... I have some test code which does a crc32 over the rom
portion of u-boot to help validate the image, this code used armboot_end.
In your patch you removed that symbol.  Bss_start seems to be an "almost"
proper substitution.  I say almost as an ALIGN 4 is done before it.  If the
cmd size ended on a byte or half word boundary this would mess up the crc32
from what I might expect...In practice it might be that GCC generates things
such that it pads to this anyway).  Adding another symbol is easy, just
thought I'd point out that it "might" not be strictly equivilent the way you
did it...


Richard W.

-----Original Message-----
From: u-boot-users-admin at lists.sourceforge.net
[mailto:u-boot-users-admin at lists.sourceforge.net] On Behalf Of Anders Larsen
Sent: Friday, January 09, 2004 5:14 AM
To: Wolfgang Denk
Cc: u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] [PATCH] fix the ARM memory layout

Wolfgang Denk <wd at denx.de> schreibt:
>In message <fc.004c4e48001e6497004c4e48001e6497.1e64ae at rea.de> you wrote:
>> here's a fresh version of my rather intrusive patch from the 17.th sept.
>> to rearrange the ARM memory layout to bring it in line with the README.
>Sorry, I'm working through my backlog sequentuially,  and  I  already
>added  the  other  patch.  Can  you please check your current version
>against current top-of-tree in CVS and provide a new diff?

Hi Wolfgang,

the attached patch (against CVS 2004-01-08) fixes the rest of the ARM
stuff I had in the pipe.

In particular, the abort-stack is now set up in the correct RAM area
(which I had neglected in my previous patches), and the BSS is zeroed
out as it should be (which most previous ARM implementations had

Furthermore, the magic variables 'armboot_end' and 'armboot_end_data'
of the linker scripts are replaced by '__bss_start' and '_end', resp.,
which is a further step to eliminate unnecessary differences between
the implementation of the CPU architectures.

Compilation tested with MAKEALL arm, functionality only tested on my
PXA-based board.

   Fix the ARM memory layout.


(Patch gzipped due to size constraints on the list)

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