We have been using an ATSAMA5d27-SOM1-EK board to develop an application for several months. Suddenly today, it will no longer allow us to program the Backup Registers using SAM-BA.
The board boots into the SAM-BA monitor and I am able to successfully execute commands.
No error is given when I attempt to use SAM-BA to write to the backup registers, but if I immediately read back the value, it is always 0x00000000.
I am able to use SAM-BA to program the BSCR register successfully, just not any of the 4 BUREGs.
Even if I had burned in the DISABLE_BSCR fuse bit, I should be able to write to the BUREG, correct? I double checked the fuse to make sure that bit wasn't set, and apparently some of the fuse bits ARE set, (but not DISABLE_BSCR) which is odd, because I have never explicitly set the fuse. Not sure if that is related to this issue or not.
I have been using these scripts to program the BUREG for months without any issues. I have also tried these scripts with an ATSAMA5D27-D5M-CU chip on our final hardware and it still works fine.
Has anyone seen this before? Any idea what I might be doing wrong?
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