CRITICALITY

Medium

DESCRIPTION

A bug in the SATA core is integrated into the SATA controller.

Due to this bug, under certain conditions, the link locks up between the host and the device and the command times out:

• SATA_PxIS[27] IFS = 0x1 (interface fatal error status)
• SATA_PxSERR[23] DIAG_S = 0x1 (link sequence error)

Following cases can bring to these conditions (cases below are not exhaustive):

• First case:
  • D2H FIS is received;
  • D2H FIS SYNC-Escape is generated (Link illegal state transition/sequence error);
  • Link locks ups because this "bad scenario" is not well implemented;
  • Command times out;
  • Soft reset will not work because of the bug.
• Second case:
  • D2H FIS PIO Read CONTp primitive is corrupted;
  • Link locks ups because this "bad scenario" is not well implemented;
  • Command times out;
  • Soft reset will not work because of the bug.

WORKAROUND

Use a port reset (COMRESET) instead of a software reset when SATA_PxIS[27] IFS = 0x1 and SATA_PxSERR[23] DIAG_S = 0x1.

Standard software most likely uses port reset rather than a software reset to recover from such an error.

REVISIONS IMPACTED

AM571x SR 2.1, 2.0, 1.0

TDA2Ex (23mm): 2.0, 1.0

AM571x: 2.1, 2.0, 1.0

DRA72x: 2.0, 1.0