- libwolfboot.c: keep the partition state APIs (set/get_partition_state)
available to CUSTOM_PARTITION_TRAILER / WOLFBOOT_NO_PARTITIONS builds;
guard the fixed-partition APIs (sector flags, erase, trigger, success)
behind WOLFBOOT_FIXED_PARTITIONS. Add the unit-custom-trailer-nopart
compile target to lock in that configuration.
- unit-p1021-fcm-bytes.c: add program tests for status 0x81 (fail) and
0x00 (write-protected), asserting no later page is programmed.
- unit-p1021-erase-advance.c: add an erase test for status 0x00
(write-protected), asserting failure before advancing to the next block.
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