[ECOS] ARM - RAM region at other address than 0

Doyle, Patrick WPD@dtccom.com
Mon May 19 14:07:00 GMT 2003


I am pretty sure that the '5471 offers a mechanism for swapping ROM and
SDRAM at address 0.  I haven't looked at it in ages, but this is a common
"problem" with ARM based processors and they share a common solution -- the
ability to swap what shows up at address 0.

--wpd


> -----Original Message-----
> From: Backhaus Willy [mailto:w.backhaus@newage-avkseg.com] 
> Sent: Monday, May 19, 2003 9:26 AM
> To: ecos-discuss@sources.redhat.com
> Subject: [ECOS] ARM - RAM region at other address than 0
> 
> 
> hello,
> 
> we have an board with an ARM7TDMI (Texas Instruments - 
> TMS320VC5471) core
> where the ROM (flash) starts at address 0 and RAM (actually 
> SDRAM) beginns
> at address 0x10000000. this mapping can't be changed. I saw 
> in vectors.s
> (for ARM) that, it is presumed that the RAM region always 
> starts at address
> 0. some of the exception vectors are copied from the 
> __exception_vectors
> label to address 0 + offset.
> 
> to port eCos, do I have to change vectors.s to copy the 
> __exception_handlers
> to other address than 0? or it's possible to obtain this with 
> a processor
> specific HAL?
> 
> thank you.
> 
> Regards,
> 
> Backhaus Willy
> 
> 
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