| 1 | =======================================
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| 2 | tgafb - TGA graphics framebuffer driver
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| 3 | =======================================
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| 4 |
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| 5 | This is a driver for DECChip 21030 based graphics framebuffers, a.k.a. TGA
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| 6 | cards, which are usually found in older Digital Alpha systems. The
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| 7 | following models are supported:
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| 8 |
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| 9 | - ZLxP-E1 (8bpp, 2 MB VRAM)
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| 10 | - ZLxP-E2 (32bpp, 8 MB VRAM)
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| 11 | - ZLxP-E3 (32bpp, 16 MB VRAM, Zbuffer)
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| 12 |
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| 13 | This version is an almost complete rewrite of the code written by Geert
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| 14 | Uytterhoeven, which was based on the original TGA console code written by
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| 15 | Jay Estabrook.
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| 16 |
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| 17 | Major new features since Linux 2.0.x:
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| 18 |
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| 19 | * Support for multiple resolutions
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| 20 | * Support for fixed-frequency and other oddball monitors
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| 21 | (by allowing the video mode to be set at boot time)
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| 22 |
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| 23 | User-visible changes since Linux 2.2.x:
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| 24 |
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| 25 | * Sync-on-green is now handled properly
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| 26 | * More useful information is printed on bootup
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| 27 | (this helps if people run into problems)
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| 28 |
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| 29 | This driver does not (yet) support the TGA2 family of framebuffers, so the
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| 30 | PowerStorm 3D30/4D20 (also known as PBXGB) cards are not supported. These
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| 31 | can however be used with the standard VGA Text Console driver.
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| 32 |
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| 33 |
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| 34 | Configuration
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| 35 | =============
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| 36 |
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| 37 | You can pass kernel command line options to tgafb with
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| 38 | `video=tgafb:option1,option2:value2,option3` (multiple options should be
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| 39 | separated by comma, values are separated from options by `:`).
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| 40 |
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| 41 | Accepted options:
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| 42 |
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| 43 | ========== ============================================================
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| 44 | font:X default font to use. All fonts are supported, including the
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| 45 | SUN12x22 font which is very nice at high resolutions.
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| 46 |
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| 47 | mode:X default video mode. The following video modes are supported:
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| 48 | 640x480-60, 800x600-56, 640x480-72, 800x600-60, 800x600-72,
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| 49 | 1024x768-60, 1152x864-60, 1024x768-70, 1024x768-76,
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| 50 | 1152x864-70, 1280x1024-61, 1024x768-85, 1280x1024-70,
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| 51 | 1152x864-84, 1280x1024-76, 1280x1024-85
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| 52 | ========== ============================================================
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| 53 |
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| 54 |
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| 55 | Known Issues
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| 56 | ============
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| 57 |
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| 58 | The XFree86 FBDev server has been reported not to work, since tgafb doesn't do
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| 59 | mmap(). Running the standard XF86_TGA server from XFree86 3.3.x works fine for
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| 60 | me, however this server does not do acceleration, which make certain operations
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| 61 | quite slow. Support for acceleration is being progressively integrated in
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| 62 | XFree86 4.x.
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| 63 |
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| 64 | When running tgafb in resolutions higher than 640x480, on switching VCs from
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| 65 | tgafb to XF86_TGA 3.3.x, the entire screen is not re-drawn and must be manually
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| 66 | refreshed. This is an X server problem, not a tgafb problem, and is fixed in
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| 67 | XFree86 4.0.
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| 68 |
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| 69 | Enjoy!
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| 70 |
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| 71 | Martin Lucina <[email protected]>
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