git: vga(4): Simplify conditions for mode rejection somewhat.

Sascha Wildner swildner at
Mon Dec 14 12:20:48 PST 2009

commit fb5d6e269d49634015cfcda26285309a7bf582ae
Author: Sascha Wildner <saw at>
Date:   Mon Dec 14 21:16:50 2009 +0100

    vga(4): Simplify conditions for mode rejection somewhat.
    When mapping the video parameter table to our mode_map, only reject modes
    which are neither 40x25, 80x25 nor 80x30, instead of rejecting or accepting
    the whole table based on comparing the initial mode's BIOS and power-up
    register settings.
    Add a VGA_KEEP_POWERON_MODE option which (when set) preserves the register
    settings which were found for the initial mode upon power-on for switching
    back to it (or some mode derived from it) from another mode. The power-on
    settings are also taken for the initial mode in case the video parameter
    table has no valid settings for it.
    This is kinda similar to what's proposed in FreeBSD's kern/64114.

Summary of changes:
 share/man/man4/vga.4           |   41 +++++++------
 sys/config/LINT                |    5 +-
 sys/dev/video/fb/vga.c         |  121 +++++++---------------------------------
 sys/platform/pc32/conf/options |    2 +-
 sys/platform/pc64/conf/options |    5 +-
 5 files changed, 49 insertions(+), 125 deletions(-)

DragonFly BSD source repository

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