Want some help with a buyer challenge. Have an SBC primarily based on the E3900 (Apollo Lake) processor. We’ve had just a few boards returned that lock-up with the next assert message:

ASSERT f:c427c427biosc427_biosSiliconBroxtonSiPkgNorthClusterLibraryPrivatePeiGraphicsInitLibPeiGraphicsPmInit.c(691): (StallCount != 3000)

This message happens within the BIOS supply operate PmInit(). Happens in step 2b of the RC Enabling course of. The operate occasions out ready for the acknowledge bit to be set.

I carried out a comparability of debug logs for a great boot and a lock-up boot. There’s little or no completely different between the 2 debug logs. Two objects of curiosity are detailed right here.

1. The code appears to execute otherwise with the identical knowledge inputs. The acknowledge bit is rarely set in both case, however the good boot proceeds as if the bit is ready. Good boot is on the left.

2. There are additionally just a few GPIO variations. The enter values at three completely different GPIO pins present completely different values. Nonetheless investigating this. Do not know the way these variations would trigger the lock-up. Might this point out a APL GPIO degradation challenge?

Any help is appreciated.