Why does Vendor Authorized Boot (VAB) certificate authentication failed in SDM?

Description

During the Second-Stage Bootloader (SSBL), you may encounter an intermittent timeout while transferring the initial 32‑word block of the VAB certificate command

Error message displayed:

#ret = 0x000007ff, resp = 0x00000000, resp_len = 1
#VAB certificate authentication failed in SDM
#### ERROR ### Please RESET the board ###

Resolution

To avoid this problem, upgrade the socfpga_v2.12.1 (socfpga_mailbox.c)

An ATF patch for socfpga_v2.12.1 is available to fix this problem :
Download and install patch mbox.patch from the attachment below.

This problem is scheduled to be resolved in a future ATF released