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-
- VIA Integration Graphic Chip Console Framebuffer Driver
-
-[Platform]
------------------------
- The console framebuffer driver is for graphics chips of
- VIA UniChrome Family(CLE266, PM800 / CN400 / CN300,
- P4M800CE / P4M800Pro / CN700 / VN800,
- CX700 / VX700, K8M890, P4M890,
- CN896 / P4M900, VX800, VX855)
-
-[Driver features]
-------------------------
- Device: CRT, LCD, DVI
-
- Support viafb_mode:
- CRT:
- 640x480(60, 75, 85, 100, 120 Hz), 720x480(60 Hz),
- 720x576(60 Hz), 800x600(60, 75, 85, 100, 120 Hz),
- 848x480(60 Hz), 856x480(60 Hz), 1024x512(60 Hz),
- 1024x768(60, 75, 85, 100 Hz), 1152x864(75 Hz),
- 1280x768(60 Hz), 1280x960(60 Hz), 1280x1024(60, 75, 85 Hz),
- 1440x1050(60 Hz), 1600x1200(60, 75 Hz), 1280x720(60 Hz),
- 1920x1080(60 Hz), 1400x1050(60 Hz), 800x480(60 Hz)
-
- color depth: 8 bpp, 16 bpp, 32 bpp supports.
-
- Support 2D hardware accelerator.
-
-[Using the viafb module]
--- -- --------------------
- Start viafb with default settings:
- #modprobe viafb
-
- Start viafb with with user options:
- #modprobe viafb viafb_mode=800x600 viafb_bpp=16 viafb_refresh=60
- viafb_active_dev=CRT+DVI viafb_dvi_port=DVP1
- viafb_mode1=1024x768 viafb_bpp=16 viafb_refresh1=60
- viafb_SAMM_ON=1
-
- viafb_mode:
- 640x480 (default)
- 720x480
- 800x600
- 1024x768
- ......
-
- viafb_bpp:
- 8, 16, 32 (default:32)
-
- viafb_refresh:
- 60, 75, 85, 100, 120 (default:60)
-
- viafb_lcd_dsp_method:
- 0 : expansion (default)
- 1 : centering
-
- viafb_lcd_mode:
- 0 : LCD panel with LSB data format input (default)
- 1 : LCD panel with MSB data format input
-
- viafb_lcd_panel_id:
- 0 : Resolution: 640x480, Channel: single, Dithering: Enable
- 1 : Resolution: 800x600, Channel: single, Dithering: Enable
- 2 : Resolution: 1024x768, Channel: single, Dithering: Enable (default)
- 3 : Resolution: 1280x768, Channel: single, Dithering: Enable
- 4 : Resolution: 1280x1024, Channel: dual, Dithering: Enable
- 5 : Resolution: 1400x1050, Channel: dual, Dithering: Enable
- 6 : Resolution: 1600x1200, Channel: dual, Dithering: Enable
-
- 8 : Resolution: 800x480, Channel: single, Dithering: Enable
- 9 : Resolution: 1024x768, Channel: dual, Dithering: Enable
- 10: Resolution: 1024x768, Channel: single, Dithering: Disable
- 11: Resolution: 1024x768, Channel: dual, Dithering: Disable
- 12: Resolution: 1280x768, Channel: single, Dithering: Disable
- 13: Resolution: 1280x1024, Channel: dual, Dithering: Disable
- 14: Resolution: 1400x1050, Channel: dual, Dithering: Disable
- 15: Resolution: 1600x1200, Channel: dual, Dithering: Disable
- 16: Resolution: 1366x768, Channel: single, Dithering: Disable
- 17: Resolution: 1024x600, Channel: single, Dithering: Enable
- 18: Resolution: 1280x768, Channel: dual, Dithering: Enable
- 19: Resolution: 1280x800, Channel: single, Dithering: Enable
-
- viafb_accel:
- 0 : No 2D Hardware Acceleration
- 1 : 2D Hardware Acceleration (default)
-
- viafb_SAMM_ON:
- 0 : viafb_SAMM_ON disable (default)
- 1 : viafb_SAMM_ON enable
-
- viafb_mode1: (secondary display device)
- 640x480 (default)
- 720x480
- 800x600
- 1024x768
- ... ...
-
- viafb_bpp1: (secondary display device)
- 8, 16, 32 (default:32)
-
- viafb_refresh1: (secondary display device)
- 60, 75, 85, 100, 120 (default:60)
-
- viafb_active_dev:
- This option is used to specify active devices.(CRT, DVI, CRT+LCD...)
- DVI stands for DVI or HDMI, E.g., If you want to enable HDMI,
- set viafb_active_dev=DVI. In SAMM case, the previous of
- viafb_active_dev is primary device, and the following is
- secondary device.
-
- For example:
- To enable one device, such as DVI only, we can use:
- modprobe viafb viafb_active_dev=DVI
- To enable two devices, such as CRT+DVI:
- modprobe viafb viafb_active_dev=CRT+DVI;
-
- For DuoView case, we can use:
- modprobe viafb viafb_active_dev=CRT+DVI
- OR
- modprobe viafb viafb_active_dev=DVI+CRT...
-
- For SAMM case:
- If CRT is primary and DVI is secondary, we should use:
- modprobe viafb viafb_active_dev=CRT+DVI viafb_SAMM_ON=1...
- If DVI is primary and CRT is secondary, we should use:
- modprobe viafb viafb_active_dev=DVI+CRT viafb_SAMM_ON=1...
-
- viafb_display_hardware_layout:
- This option is used to specify display hardware layout for CX700 chip.
- 1 : LCD only
- 2 : DVI only
- 3 : LCD+DVI (default)
- 4 : LCD1+LCD2 (internal + internal)
- 16: LCD1+ExternalLCD2 (internal + external)
-
- viafb_second_size:
- This option is used to set second device memory size(MB) in SAMM case.
- The minimal size is 16.
-
- viafb_platform_epia_dvi:
- This option is used to enable DVI on EPIA - M
- 0 : No DVI on EPIA - M (default)
- 1 : DVI on EPIA - M
-
- viafb_bus_width:
- When using 24 - Bit Bus Width Digital Interface,
- this option should be set.
- 12: 12-Bit LVDS or 12-Bit TMDS (default)
- 24: 24-Bit LVDS or 24-Bit TMDS
-
- viafb_device_lcd_dualedge:
- When using Dual Edge Panel, this option should be set.
- 0 : No Dual Edge Panel (default)
- 1 : Dual Edge Panel
-
- viafb_lcd_port:
- This option is used to specify LCD output port,
- available values are "DVP0" "DVP1" "DFP_HIGHLOW" "DFP_HIGH" "DFP_LOW".
- for external LCD + external DVI on CX700(External LCD is on DVP0),
- we should use:
- modprobe viafb viafb_lcd_port=DVP0...
-
-Notes:
- 1. CRT may not display properly for DuoView CRT & DVI display at
- the "640x480" PAL mode with DVI overscan enabled.
- 2. SAMM stands for single adapter multi monitors. It is different from
- multi-head since SAMM support multi monitor at driver layers, thus fbcon
- layer doesn't even know about it; SAMM's second screen doesn't have a
- device node file, thus a user mode application can't access it directly.
- When SAMM is enabled, viafb_mode and viafb_mode1, viafb_bpp and
- viafb_bpp1, viafb_refresh and viafb_refresh1 can be different.
- 3. When console is depending on viafbinfo1, dynamically change resolution
- and bpp, need to call VIAFB specified ioctl interface VIAFB_SET_DEVICE
- instead of calling common ioctl function FBIOPUT_VSCREENINFO since
- viafb doesn't support multi-head well, or it will cause screen crush.
-
-
-[Configure viafb with "fbset" tool]
------------------------------------
- "fbset" is an inbox utility of Linux.
- 1. Inquire current viafb information, type,
- # fbset -i
-
- 2. Set various resolutions and viafb_refresh rates,
- # fbset <resolution-vertical_sync>
-
- example,
- # fbset "1024x768-75"
- or
- # fbset -g 1024 768 1024 768 32
- Check the file "/etc/fb.modes" to find display modes available.
-
- 3. Set the color depth,
- # fbset -depth <value>
-
- example,
- # fbset -depth 16
-
-
-[Configure viafb via /proc]
----------------------------
- The following files exist in /proc/viafb
-
- supported_output_devices
-
- This read-only file contains a full ',' separated list containing all
- output devices that could be available on your platform. It is likely
- that not all of those have a connector on your hardware but it should
- provide a good starting point to figure out which of those names match
- a real connector.
- Example:
- # cat /proc/viafb/supported_output_devices
-
- iga1/output_devices
- iga2/output_devices
-
- These two files are readable and writable. iga1 and iga2 are the two
- independent units that produce the screen image. Those images can be
- forwarded to one or more output devices. Reading those files is a way
- to query which output devices are currently used by an iga.
- Example:
- # cat /proc/viafb/iga1/output_devices
- If there are no output devices printed the output of this iga is lost.
- This can happen for example if only one (the other) iga is used.
- Writing to these files allows adjusting the output devices during
- runtime. One can add new devices, remove existing ones or switch
- between igas. Essentially you can write a ',' separated list of device
- names (or a single one) in the same format as the output to those
- files. You can add a '+' or '-' as a prefix allowing simple addition
- and removal of devices. So a prefix '+' adds the devices from your list
- to the already existing ones, '-' removes the listed devices from the
- existing ones and if no prefix is given it replaces all existing ones
- with the listed ones. If you remove devices they are expected to turn
- off. If you add devices that are already part of the other iga they are
- removed there and added to the new one.
- Examples:
- Add CRT as output device to iga1
- # echo +CRT > /proc/viafb/iga1/output_devices
-
- Remove (turn off) DVP1 and LVDS1 as output devices of iga2
- # echo -DVP1,LVDS1 > /proc/viafb/iga2/output_devices
-
- Replace all iga1 output devices by CRT
- # echo CRT > /proc/viafb/iga1/output_devices
-
-
-[Bootup with viafb]:
---------------------
- Add the following line to your grub.conf:
- append = "video=viafb:viafb_mode=1024x768,viafb_bpp=32,viafb_refresh=85"
-