RE: [ECOS] New IMMR address not recognized

["Cusson, Pascal" <pascal dot cusson at analog dot com>]

Hi Paul,
   First I am not using the RedBoot. I am using a JTAG to boot my board.
The JTAG configures the IMMR as well as the SDRAM. I have been using
that configuration for about 2 months and without any problem. From what
I have tried, I cannot access any of the registers. All of them give me
a signal error - > IGSIGV which display a Segmentation Fault in
Insight(gdb).

  The strange thing here is that in hal/powerpc/ts6/current/src/ts6.S I
set a few register and they all get set properly when I read them back
with my JTAG. Once I get my application running, I get the segmentation
fault on any attempt to read or write a mapped register.

  One more thing, I can write at address 0x04700000 which should give a
segmentation fault since my IMMR is at address 0xf0000000 and not
0x04700000 anymore. I can confirm this through my JTAG

   The code was originally written for an IMMR at 0x04700000 but for
memory reason and because of my previous application, I had to move the
IMMR at 0xF0000000.

   It looks like somehow, the addresses 0xf0000000 are blocked. Is there
such a mechanism in eCos ?

If you can think of anything, please let me know.

Best regards,

Pascal

-----Original Message-----
From: Paul Fine [mailto:pfine@delcomsys.com]
Sent: Thursday, November 07, 2002 9:33 AM
To: Cusson, Pascal; Patrick Doyle
Cc: ecos-discuss@sources.redhat.com
Subject: Re: [ECOS] New IMMR address not recognized


Pascal,

Is it just one specific register in the 0xF001xxxx memory space that
causes 
the segmentation fault, or is it any memory address in the range?

You can read the value of the IMMR.  For instance, at the RedBoot
prompt, I 
can type

         RedBoot> x -b 0x047101a8 -4 -l 4
         047101A8: 04700011
         RedBoot>

The upper 16 bits (0470) tell me that the internal memory mapped
registers 
are at base 0x04700000.  The lower 16 bits give version information.

If the value of the IMMR that you read is similar to the one I am
showing 
here, then I am not surprised that writing to an address in the range 
0xF001xxxx crashes the PPC.

How are you changing the IMMR?  Are you loading code with RedBoot?


At 03:44 PM 11/6/2002 -0500, Cusson, Pascal wrote:
>Hi Patrick,
>    I have a small question for you on the 8260 port you gave me. I am 
> trying to make my IMMR 0xF0000000 instead of 0x04700000. The reason
being 
> that it is the default on my board and that my entire application uses

> 0xF0000000.
>
>    So far I have modified all files containing 0x04700000 under 
> powerpc/mpc8260 and powerpc/ts6. However, when writing one of the 
> register at address 0xf001xxxx, I get a segmentation fault. Meaning I
am 
> not writing in at a valid address. However I can write at address 
> 0x04700000 no problem. Is there something else I need to modify in
eCos ?
>
>Thanks for you help
>
>Pascal
>
>--
>Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
>and search the list archive: http://sources.redhat.com/ml/ecos-discuss

Paul Fine
Senior Member of Technical Staff
Delphi Communication Systems, Inc.

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