72 lines
2.5 KiB
ReStructuredText
72 lines
2.5 KiB
ReStructuredText
==============
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What is tgafb?
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==============
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This is a driver for DECChip 21030 based graphics framebuffers, a.k.a. TGA
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cards, which are usually found in older Digital Alpha systems. The
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following models are supported:
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- ZLxP-E1 (8bpp, 2 MB VRAM)
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- ZLxP-E2 (32bpp, 8 MB VRAM)
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- ZLxP-E3 (32bpp, 16 MB VRAM, Zbuffer)
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This version is an almost complete rewrite of the code written by Geert
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Uytterhoeven, which was based on the original TGA console code written by
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Jay Estabrook.
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Major new features since Linux 2.0.x:
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* Support for multiple resolutions
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* Support for fixed-frequency and other oddball monitors
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(by allowing the video mode to be set at boot time)
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User-visible changes since Linux 2.2.x:
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* Sync-on-green is now handled properly
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* More useful information is printed on bootup
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(this helps if people run into problems)
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This driver does not (yet) support the TGA2 family of framebuffers, so the
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PowerStorm 3D30/4D20 (also known as PBXGB) cards are not supported. These
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can however be used with the standard VGA Text Console driver.
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Configuration
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=============
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You can pass kernel command line options to tgafb with
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`video=tgafb:option1,option2:value2,option3` (multiple options should be
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separated by comma, values are separated from options by `:`).
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Accepted options:
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========== ============================================================
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font:X default font to use. All fonts are supported, including the
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SUN12x22 font which is very nice at high resolutions.
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mode:X default video mode. The following video modes are supported:
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640x480-60, 800x600-56, 640x480-72, 800x600-60, 800x600-72,
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1024x768-60, 1152x864-60, 1024x768-70, 1024x768-76,
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1152x864-70, 1280x1024-61, 1024x768-85, 1280x1024-70,
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1152x864-84, 1280x1024-76, 1280x1024-85
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========== ============================================================
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Known Issues
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============
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The XFree86 FBDev server has been reported not to work, since tgafb doesn't do
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mmap(). Running the standard XF86_TGA server from XFree86 3.3.x works fine for
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me, however this server does not do acceleration, which make certain operations
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quite slow. Support for acceleration is being progressively integrated in
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XFree86 4.x.
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When running tgafb in resolutions higher than 640x480, on switching VCs from
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tgafb to XF86_TGA 3.3.x, the entire screen is not re-drawn and must be manually
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refreshed. This is an X server problem, not a tgafb problem, and is fixed in
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XFree86 4.0.
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Enjoy!
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Martin Lucina <mato@kotelna.sk>
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