Sun Microsystems Sun XVR-200, Installation Manual

Page: 43 / 60

Appendix A Changing the Console Resolution at the OpenBoot Prompt 27
The following is a brief description of the 10 parameters used in this method:
■
Horizontal resolution (in pixels)
■
Horizontal blanking total
■
Horizontal front porch
■
Horizontal sync width
■
Vertical resolution (in lines)
■
Vertical blanking total
■
Vertical front porch
■
Vertical sync width
■
Dotclock in Hz
■
Sync value:
■
0 separate sync
■
25 6sync on green
■
512 positive vertical sync pulse
■
1024 positive horizontal sync pulse
■
2048 composite sync
You can add the sync values together to select more than one of the preceding
values.
Video Mode Troubleshooting
TABLE A-3
Video Mode Troubleshooting
Problem Solution
Used the method
described in this
Appendix to
configure the
console resolution,
but the card still
defaults to
something other
than the resolution
specified. A priority scheme is used to determine the boot console resolution.
The Sun XVR-200 graphics accelerator firmware checks the various
methods in order of priority. If the device finds the resolution from
the current method, it uses that resolution. Otherwise, it goes down
the priority list to find the resolution information. Finally, if there is
no resolution information, the device uses the default resolution.
The resolution-setting methods are enumerated in order of
decreasing priority:
1. output-device method (see
“Output-Device Method” on page 23 )
2. video-timing method (see “Video-Timing Method” on page 26 )
3. video-mode method (see “Video-Mode Method” on page 24 )
4. DDC2B/EDID (see “Output-Device Method” on page 23 )
5. Default resolution for the board