port-hpcarm/51330: Unable to install onto CF card despite kernel detecting it as wd0

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>Number:         51330
>Category:       port-hpcarm
>Synopsis:       Unable to install onto CF card despite kernel detecting it as wd0
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-hpcarm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jul 09 19:35:00 +0000 2016
>Originator:     Sevan Janiyan
>Release:        HEAD
>Organization:
>Environment:
>Description:
Attempting to install from the latest HEAD snapshot on a Jornada 720 fails, sysinst reports no disk is detected & disklabel wd0 reports that /dev/rwd0 is not configured.
The kernel does detect the CF card as wd0 & I've successfully wiped the card using dd whilst booted in this environment.
System / CF card is ok because I was able to install the latest STABLE snapshot without issue.
>How-To-Repeat:
Attempt to install a latest snapshot of HEAD on a Jornada 720
>Fix: