I'm linking my code without the use of a scatter file. As a constrain, I'm using the default region symbols
IMPORT ||Image$$ER_RO$$Base|| IMPORT ||Image$$ER_RO$$Limit|| IMPORT ||Image$$ER_RO$$Length|| IMPORT ||Image$$ER_RW$$Base|| IMPORT ||Image$$ER_RW$$Limit|| IMPORT ||Image$$ER_RW$$Length|| IMPORT ||Image$$ER_ZI$$Base|| IMPORT ||Image$$ER_ZI$$Limit|| IMPORT ||Image$$ER_ZI$$Length||
The RO and the RW symbols are correct. The Image$$ER_ZI$$Base is reported correct, but the Image$$ER_ZI$$Limit is the same as the Base and, as a result, Image$$ER_ZI$$Length is 0.
At linking, I get the following message:
Program Size: Code=118868 RO-data=9832 RW-data=2456 ZI-data=206072
So there is ZI data.
Why are the two symbols, Image$$ER_ZI$$Base and Image$$ER_ZI$$Limit, equal and what can I do to correct this?
Thank you!
This may be related to linker problems that Keil put on the "wish list" last September. The documentation is not (in my opinion) very clear or helpful in this area.
See http://www.keil.com/forum/docs/thread10582.asp for more details.
Have you tried with compression turned off ("--datacompressor off") ?
Thanks for the answer, David.
I did manage to go around, though, by using Image$$ZI$$Base instead of Image$$ER_ZI$$Base and Image$$ZI$$Limit instead of Image$$ER_ZI$$Limit. The Image$$ER_ZI$$Length symbol is not available.
Nevertheless, I did not use the symbols is my assembly code because, for an unknown reason, the RW data section gets messed up.
Instead, I imported the symbols in my low level init C routine, and successfully used them from there.
The code is something like this:
extern int Image$$ZI$$Base; extern int Image$$ZI$$Limit; void AT91F_ClearBSS(){ ushort *start, *end; start = (ushort *)&Image$$ZI$$Base; end = (ushort *)&Image$$ZI$$Limit; while(start<end){ *start = 0; start++; } }
Regards.