Details:

When the PRU-ICSSG is configured as a 1Gbps Ethernet switch, and the FDB is used, during an FDB lookup there is a one PRU clock cycle window during which the FDB can be corrupted if there is a broadside access by PRU0.

The FDB lookup can be initiated by either port or by host action. Each row within the FDB has 4 “buckets,” or 32 Bytes, resulting in up to 4 buckets being corrupted at the given SA Hash index (depending on the PRU0 byte enables during the concurrent broadside access).

Broadside accesses by PRUs other than PRU0 have no affect.

Workaround(s):

A workaround within firmware to avoid PRU0 broadside access during the FDB lookup is possible but complex and not planned.