PROBLEM: (DEKQB0007) (PATCH ID: OSF500-168)
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This patch corrects a problem with some DE50x interfaces that use the
Micro Linear ML6694F PHY.  The ML6694F incorporates internal changes to
make the link more stable when inserting/de-inserting a cable and on
initial startups.  Physical inspection of the interface is required to
determine if an ML6694F is used.  The ML6694F is one of the larger chips
and is clearly marked for easy identification.  This patch includes a
run-time patchable variable called tu_6694_delay and it is ENABLED by
default.  If your DC21143 adapter does not have the ML6694F chip on it,
you can set this flag to 0.  As root, use dbx to change the parameter.
#dbx -k /vmunix
dbx> p tu_6694_delay 0		to permanently patch vmunix or
dbx> a tu_6694_delay 0		to assign the value until next reboot
dbx> q				to exit