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Discussion Groups | Freescale DSPs | Changing the BOOTMAP bit on 56F805 or family member

Technical discussions about Freescale (Motorola) DSPs (including the DSP56000, DSP56300, DSP56600, 56800 DSPs).

  

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Changing the BOOTMAP bit on 56F805 or family member - dsp_sense - Oct 26 15:59:00 2004


Does anyone have any experience with changing the bootmap bit in
SYS_CNTRL on the fly? I am trying to change it to 1 to access an
external peripheral in program space, but the processor appears to
reset/crash when I do this. I'd like to be able to change it to 1,
read the peripheral and then change it back to zero so I can still
access the bootflash.

Thanks for the help.




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Re: Changing the BOOTMAP bit on 56F805 or family member - Author Unknown - Oct 26 17:29:00 2004

Try this:
 
#define BOOTMAP_A 0xFFEF
#define BOOTMAP_B 0x0010
#define SYS_BASE 0x0000
#define SYS_CNTL (volatile unsigned short*)(SYS_BASE+0x0)
To set bootmap B use:
*SYS_CNTL = *SYS_CNTL | BOOTMAP_B;
 
To re-set to bootmap A use:
*SYS_CNTL = *SYS_CNTL & BOOTMAP_A;
 
Hope this helps
 
J.K. Herrera
 
 
-------------- Original message --------------

Does anyone have any experience with changing the bootmap bit in
SYS_CNTRL on the fly? I am trying to change it to 1 to access an
external peripheral in program space, but the processor appears to
reset/crash when I do this. I'd like to be able to change it to 1,
read the peripheral and then change it back to zero so I can still
access the bootflash.

Thanks for the help.


_____________________________________
/groups.php3
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Re: Changing the BOOTMAP bit on 56F805 or family member - S L - Oct 26 18:07:00 2004

This is basically what I was trying, except that I was using a bit set/bit clear. I tried it your way and still have the same problem... the processor resets/crashes.
 
Also, I noticed you showed SYS_BASE defined as 0x0, I believe it should be 0xc00 or am I missing something?
 
Thanks.

j...@comcast.net wrote:
Try this:
 
#define BOOTMAP_A 0xFFEF
#define BOOTMAP_B 0x0010
#define SYS_BASE 0x0000
#define SYS_CNTL (volatile unsigned short*)(SYS_BASE+0x0)
To set bootmap B use:
*SYS_CNTL = *SYS_CNTL | BOOTMAP_B;
 
To re-set to bootmap A use:
*SYS_CNTL = *SYS_CNTL & BOOTMAP_A;
 
Hope this helps
 
J.K. Herrera
 
 
-------------- Original message --------------

Does anyone have any experience with changing the bootmap bit in
SYS_CNTRL on the fly? I am trying to change it to 1 to access an
external peripheral in program space, but the processor appears to
reset/crash when I do this. I'd like to be able to change it to 1,
read the peripheral and then change it back to zero so I can still
access the bootflash.

Thanks for the help.


_____________________________________
/groups.php3


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