RE: [ECOS] Memory access problem

[Gary Thomas <gthomas at ecoscentric dot com>]

Please address replies to the discussion list.  Private replies are
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On Tue, 2002-10-08 at 17:00, Cusson, Pascal wrote:
> I do thinks like *(unsigned int*)0xf0010100 = 0xaaaaaaaa;
> 
> I know this isn't the nice way of doing it but it is just for test purpose.
> 
> Chances are my immr is missed mapped. When using my JTAG, it gives my 0xf000
> 0000 as immr. However, it seems like eCos does not recognize that segment of
> memory (error: Segmentation Fault).
> 
> Do you know of any other place this might be set.
> 
> Pascal
> 
> PS: The only line I changed in hal_aux.c: IMM = (t_PQ2IMM *)0xf0000000;
> I could not find any hal_aux.h attached is my file
> 

The IMMR is normally set to 0xFA200000 by eCos - this matches what 
Motorola's PPCbug uses.  This is set in the file:
  packages/hal/powerpc/mpc8xx/current/include/var_regs.h

> 
> 
> -----Original Message-----
> From: Gary Thomas [mailto:gthomas@ecoscentric.com]
> Sent: Tuesday, October 08, 2002 6:48 PM
> To: Cusson, Pascal
> Cc: eCos Discussion
> Subject: Re: [ECOS] Memory access problem
> 
> 
> On Tue, 2002-10-08 at 16:43, Cusson, Pascal wrote:
> > Hi everyone,
> >    In the process of porting my ecos on a 8260 board, I cannot access memory
> map
> > registers anymore. Something I used to be able to do with the simulator. I get
> a
> > Segmentation Fault. My question is does eCos prohibit the access to the mapped
> > registers in threads ? If so, how should I access my registers ?
> 
> Make sure that they've been properly mapped in.  This information
> is kept in the file <platform>/current/src/hal_aux.h
> 
> -- 
> ------------------------------------------------------------
> Gary Thomas                  |
> eCosCentric, Ltd.            |  
> +1 (970) 229-1963            |  eCos & RedBoot experts
> gthomas@ecoscentric.com      |
> http://www.ecoscentric.com/  |
> ------------------------------------------------------------
-- 
------------------------------------------------------------
Gary Thomas                  |
eCosCentric, Ltd.            |  
+1 (970) 229-1963            |  eCos & RedBoot experts
gthomas@ecoscentric.com      |
http://www.ecoscentric.com/  |
------------------------------------------------------------


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