Hello,
after reading and looking at the examples in this data sheet: PIC32MX
Section 3. Memory Organization
http://ww1.microchip.com/downloads/en/DeviceDoc/61115F.pdf
i think the settings in pic32mx.cfg are wrong, but ...
Suppose we have 16K of RAM. ( *_WORKAREASIZE 0x4000*).
* set _PIC32MX_DATASIZE 0x800
*
2K
* set _PIC32MX_PROGSIZE [expr ($_WORKAREASIZE - $_PIC32MX_DATASIZE)]
* 14K
*# BMXDKPBA: 2k kernel data @ 0xa0000800
mww 0xbf882010 $_PIC32MX_DATASIZE *
OK: 2k kernel data from 0xa0000000 to 0xa0000800
* # BMXDUDBA: 16k kernel program @ 0xa0000800*
* mww 0xbf882020 $_PIC32MX_PROGSIZE
* Why not 16K (_WORKAREASIZE)?
Now we have kernel program memory from 2k to 14k and from 14k to 16k
in user space 2k.
Kernel program memory starts at 0xa0000800. Size 12k.
*# BMXDUPBA: 0k user program*
* mww 0xbf882030 $_PIC32MX_PROGSIZE
* Why not 16K (_WORKAREASIZE)?
Now we have 2k user program memory, and 0k user data memory.
* $_TARGETNAME configure -work-area-phys 0xa0000800 -work-area-size
$_PIC32MX_PROGSIZE -work-area-backup 0*
We set -work-area-size to 14K but we have only 12k.
At first glance, with actual driver code, this is not a problem if we
have 16k RAM or more memory. But with 8k or 4k probably it will not work.
For example with 4K RAM we end up setting -work-area-size to 2K but
there is no kernel program memory at all.
I am wrong?
Thanks, Salvador.
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