I know that on the 824, there is some RAM that is wiped during power cycles, Deep Power Down, or a BOR, but is retained during successive resets. From the 824 UM (Page 11):
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Remark: SRAM location 0x1000 0000 to 0x1000 0050 is not used by the bootloader and the memory content in this area is retained during reset. SRAM memory is not retained when the part powers down or enters Deep power-down mode.
Anyways, I am wondering if there is a means to an end here, w/o having to resort to user code doing an IAP of some Flash location, to keep track of something like this in a predictable and cross-target manner.
Bruce/Mike, care to comment (please).?. Others who might have skinned this cat already are also requested to comment. TIA.