Hi,
I want to add support for the embedded flash (128/256/512 kbytes) in those SoCs.
In short this flash has the following unique features:
1. memory mapped and read accessible like any NOR flash 2. at reset it can also be mapped to adress 0x0 (by setting a NV bit) 3. it has a pagesize of 512 bytes, only full pages can be rewritten with 32 bit access 4. regions of 32 pages (hence 16 kbytes) can be locked (write protected) 5. the exact disposition (#pages, lock status etc) of the flash can be enquired at run time and hence should not be #defined at compile time
Feature 3 prevents a simple "cp" like command like for NOR flash unless the copy command can be made to fail when it does not encompass full pages AND the copy command can be made such that the copying to flash itself is done by a specialised function.
"protect on/off" could be made similiarly working, rounding up to full region sizes
a command to set/reset that NV bit should be added
Another possible solution would be to add a new command similiar to the "NAND" command for write purposes, lock and NV bit.
Finally, u-boot itself, the environment and a possible backup should be able to be in that flash, too.
Any comments/suggestions on this?
Reinhard