[rescue] useful U30 framebuffer/OBP info

[Larry Snyder]

There's a FIN (I0618-1) that describes an OBP bug that causes wrong
timings to be used if you tell the obp to use 1024x768x75 and have
a Creator/Elite fb.  It sets the refresh rate to 80.  The only
reference to OBP versions says it wasn't reproducible w/ 2.9 and
an FFB2+, so I'm not sure if it applies to later versions.  I applied
the patch to a flashed 3.27.0 OBP and it didn't hurt.  And the VG150
now displays the boot messages just fine.  Anyhow, here's the patch:

 #!/bin/sh

   eeprom fcode-debug?=true
   eeprom nvramrc="probe-all
   dev /SUNW,ffb at 1e,0
   # Note: Use correct path to frame buffer in previous line
   base @ hex
   patch 46 4b pclk78
   base !
   device-end
   install-console banner"
   eeprom use-nvramrc?=true

It's only useful to fix the 1024x768x75 setting.  Hope somebody finds
it helpful.
-ls-