SPRZ408D June 2014 – June 2021 AM4372 , AM4376 , AM4377 , AM4378 , AM4379
Ethernet Boot: ROM May Select 1-Gbit, Half-Duplex Mode During Auto-negotiation and Fail to Boot
1.1, 1.2
The Ethernet controller on the device does not support 1-Gbit, half-duplex mode. If a connected Ethernet PHY is boot strapped to enable auto-negotiation at 1-Gbit, half-duplex, the ROM may choose this mode inadvertently and never sends out a BOOTP packet to initiate Ethernet boot. Ethernet boot fails in this case.
Ensure that a connected Ethernet PHY precludes the advertisement of 1-Gbit, half-duplex mode. This can typically be done with proper boot strapping options on the Ethernet PHY.