Framebuffer driver for Cirrus Logic chipsets

Copyright 1999 Jeff Garzik <>

Chip families supported:
  • SD64
  • Piccolo
  • Picasso
  • Spectrum
  • Alpine (GD-543x/4x)
  • Picasso4 (GD-5446)
  • GD-5480
  • Laguna (GD-546x)
Bus’s supported:
  • PCI
  • Zorro
Architectures supported:
  • i386
  • Alpha
  • PPC (Motorola Powerstack)
  • m68k (Amiga)

Default video modes

At the moment, there are two kernel command line arguments supported:

  • mode:640x480
  • mode:800x600
  • mode:1024x768

Full support for startup video modes (modedb) will be integrated soon.


  • Fix memory detection for 512kB case
  • 800x600 mode
  • Fixed timings
  • Hint for AXP: Use -accel false -vyres -1 when changing resolution


  • Preliminary Laguna support
  • Overhaul color register routines.
  • Associated with the above, console colors are now obtained from a LUT called ‘palette’ instead of from the VGA registers. This code was modelled after that in atyfb and matroxfb.
  • Code cleanup, add comments.
  • Overhaul SR07 handling.
  • Bug fixes.


  • Correctly set default startup video mode.
  • Do not override ram size setting. Define CLGEN_USE_HARDCODED_RAM_SETTINGS if you _do_ want to override the RAM setting.
  • Compile fixes related to new 2.3.x IORESOURCE_IO[PORT] symbol changes.
  • Use new 2.3.x resource allocation.
  • Some code cleanup.


  • Casting fixes.
  • Assertions no longer cause an oops on purpose.
  • Bug fixes.


  • Add compatibility support. Now requires a 2.1.x, 2.2.x or 2.3.x kernel.

Version 1.9.4

  • Several enhancements, smaller memory footprint, a few bugfixes.
  • Requires kernel 2.3.14-pre1 or later.

Version 1.9.3

  • Bundled with kernel 2.3.14-pre1 or later.