I'm sitting on a fix for that which needs some testing.
I hope to get it into current shortly.

The problem is that the "search for idprom" routine uses
an idprom checkum that is incorrect because it tries to
checksum all 32 bytes.  It should check only 16 bytes.

Ralph Meyer writes:
 > hi,
 > 
 > if i try to netboot my sun, it stops with the folowing error 
 > idprom: not found in monitor
 > 
 > what does it mean ?
 > 
 > thanks
 > 
 > ralph
 > 
 > ps: i changed the nvram battery and i can not boot from the sd device or
 > mount it over the sun (net)boot file
 >