On 10/01/2020 17:08, Russell King - ARM Linux admin wrote:

On Fri, Jan 10, 2020 at 04:53:06PM +0000, ѽ҉ᶬḳ℠ wrote:

quoted

Seems that the debug avenue has been exhausted, short of running SFP.C in
debug mode.

You're saying you never see TX_FAULT asserted other than when the
interface is down?

Yes, it never exhibits once the iif is up - it is rock-stable in that 
state, only ever when being transitioned from down state to up state.
Pardon, if that has not been made explicitly clear previously.