Hi Jim, How do you access the battery backed RAM? Is the battery backed RAM part of the heap? Special section? On a system that I worked on, which had I/O memory at 0xC0000000, part of which was battery backed memory, I used this: char* RawC000Page = (char*)0xC0000000; I also used this for the same memory: struct C000Page_t* C000Page = (struct C000Page_t*)0xC0000000; Note: some of the C000Page_t was write-only (reading would be BAD), some of C000Page_t was read-only (writing would be BAD), some was read/write (but reading and writing semantically meant different things to the I/O register), and some was battery backed RAM (reading/writing okay). The memory was not part of the heap, nor was it part of the .data or .bss sections. I just wrangled a pointer to point to it. There was no OS, it was just the code in EEPROM, bootstrapped from an initialization ROM. There was a managed heap using malloc/free, but that heap was no where near the 0xC0000000 page. The stack was carved out of the heap. Would something like this work for you? HTH, --Eljay
