5.2 unbootable on my hardware

Apologies for the delay in reporting this, but I've had other
commitments which haven't allowed to me to sit down with this before
tonight.

Sometime between October 5th and November 4th an ATA change has made
current unbootable on my machine.

Verbose boot messages are attached for an October 5th kernel and one
from today's checkout.

Any help I can offer is available - if a committer wants root access and
a serial console that can also be done.

Ceri

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