原创 AT91SAM9261B DataFlash/Serial Flash Boot ROM limit

AT91SAM9261 revision B (AT91SAM9261B) DataFlash / Serial FLash Boot ROM limitation

On the AT91SAM9261 Boot ROM, the DataFlash or Serial Flash downloadable code size is supposed to be smaller than 156Kbytes.

But for the AT91SAM9261 revision B, there is a limitation: the maximum downloadable code size is 64Kbytes.

Workaround:

A) Reduce first level bootloader code to 64kBytes to boot on a second level bootloader code if needed.

B) If  not possible, use another memory for booting purpose such as NandFlash, serial EEPROM or a SDCard which do not have this limitation.

That limitation does not affect other memories or existing AT91SAM9 products.