Why is this soo cool? Because the default way to upgrade the OBP is to have a running system. But some times
If you have a working jump start enviroment most of the work is already done, yaha. You actully dont even have to use a solaris box to act as the upgrade server any tftp server will do.
So basically what I did here is used a already set up jump start server to upgrade the OBP on a Sun Fire v240. I deleted the link to the solaris kernel and created a symlink from the mac address to the upgrade binary.
bash-3.00# ls -l
lrwxrwxrwx 1 root root 27 Jun 6 11:40 0A2483F9 -> inetboot.SUN4U.Solaris_10-1
lrwxrwxrwx 1 root root 27 Jun 6 11:40 0A2483F9.SUN4U -> inetboot.SUN4U.Solaris_10-1
-rwxr-xr-x 1 root root 217016 Jun 6 11:40 inetboot.SUN4U.Solaris_10-1
drwxr-xr-x 2 root root 512 Jun 5 12:07 ODBUpgrade
-rw-r–r– 1 root root 321 Jun 6 11:40 rm.10.36.131.249
lrwxrwxrwx 1 root root 1 Jun 5 10:23 tftpboot -> .
bash-3.00# ls -l ODBUpgrade/
-rw-r–r– 1 root root 1482292 Jun 5 12:07 flash-update-Blade100
-rw-r–r– 1 root root 2534420 Jun 5 12:07 flash-update-SunFire240