RE: [ECOS] Use of Lauterback debugger

["Alex Lindeijer" <Alex dot L at 3D-Perception dot com>]

Hi
We already had MSR_DE include in the MSR_COMMON. We tried what
Christophe suggested without luck the De bit is still reset. As I said
we have GDB disabled , is that OK?
Cheers
Alex Lindeijer

Alex Lindeijer | 3D perception AS
Senior System Designer
alex.l@3d-perception.com
T: +47 97540959 

www.3D-perception.com
Achieving Your Vision

-----Original Message-----
From: Gary Thomas [mailto:gary@mlbassoc.com] 
Sent: 14. januar 2010 23:05
To: Alex Lindeijer
Cc: ecos-discuss@sourceware.org; Fahd Abi di
Subject: Re: [ECOS] Use of Lauterback debugger

On 01/14/2010 02:50 PM, Alex Lindeijer wrote:
> Hi again
> we set the DE (debug enable) also manually at a break long after
startup. But then it is reset again. We checked kode around interupt
handling but haven't found the code responsible for resetting. It is
certainly not done in out application code. So any hint in where the
resetting could happen is welcome,

Look at .../ecos/packages/hal/powerpc/mpc85xx/current/include/var_regs.h
I think you need to change MSR_COMMON to include MSR_DE

> -----Original Message-----
> From: Fahd Abidi
> Sent:  13/01/2010, 21:38
> To: Alex Lindeijer; ecos-discuss@sourceware.org
> Subject: RE: [ECOS] Use of Lauterback debugger
>
> look at the initial .S file, in uboot for instance its called start.S,
I'm not sure what its called in ecos. Search in there for MSR or MSR[DE]
and you will find the reference for it.
>
> Fahd
>
> ________________________________
>
> From: Alex Lindeijer [mailto:Alex.L@3D-Perception.com]
> Sent: Wed 1/13/2010 3:23 PM
> To: Fahd Abidi; ecos-discuss@sourceware.org
> Subject: RE: [ECOS] Use of Lauterback debugger
>
>
>
> Thanks for the quick reply! However I cannot find some ting for that
in the config tool. I have look in kernel code for MSR macros etc but
those didn't explain the resetting of this bit.
>
>
>
> Alex Lindeijer | 3D perception AS
> Senior System Designer
> alex.l@3d-perception.com
> T: +47 97540959
>
>
>
> www.3D-perception.com<http://www.3D-perception.com>
> Achieving Your Vision
>
>
>
> From: Fahd Abidi [mailto:fabidi@ultsol.com]
> Sent: 13. januar 2010 21:09
> To: Alex Lindeijer; ecos-discuss@sourceware.org
> Subject: RE: [ECOS] Use of Lauterback debugger
>
>
>
> You need to set a special flag in ecos, such as CONFIG_HW_DEBUG,
where it ignores the code path to disable the debug interrupt bit. This
is typically how this issue is handled in uboot or the Linux kernel.
>
>
>
> Fahd
>
>
>
> ________________________________
>
> From: ecos-discuss-owner@ecos.sourceware.org on behalf of Alex
Lindeijer
> Sent: Wed 1/13/2010 2:30 PM
> To: ecos-discuss@sourceware.org
> Subject: [ECOS] Use of Lauterback debugger
>
> Hi
> We are trying to use a Lauterbach hardware debugger on a MPC8541. For
> the debugger to work( like breakpoints/stepping) the debug interrupt
> enable bit in the Machine State Register must be set. However we see
> that even when we set it (at start-up in the kernel or manually when
> breaking/continuing), it is reset by some code in the ecos kernel.
Does
> anybody have hint where? We have not enabled GDB.
> Thanks in advance
> Alex Lindeijer
> Senior System Designer
> 3D Perception
>
> --
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>
>
>

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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