Updating Openboot PROM

[Giulio Sichel <cypher@tiscali.it>]

Hi,
I'm unable to update the boot prom on my Ultra 30. I've downloaded
105930-06 patch from sunsolve.com and I'm using network booting to
get the image (flash-update-Ultra30-latest) from a rarp/tftp server
in my LAN.
The following command:

ok> boot net:192.168.1.1,flash-update-Ultra30-latest,192.168.1.2

works perfectly and starts downloading the byte stream but at a
certain poin it stops donwloading and it prints:

"Fast Instruction Access MMU Miss"

so the flash update isn't started.
What does it mean? How can I avoid this error?

Thank you