projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 5b1d7137 WD |
1 | /* |
| 2 | * (C) Copyright 2000 | |
| 3 | * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it | |
| 4 | * | |
| 1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
| 5b1d7137 WD |
6 | */ |
| 7 | ||
| a5dbdc81 | 8 | "video-mode" environment variable |
| 2dae800f | 9 | ================================= |
| a5dbdc81 TT |
10 | |
| 11 | The 'video-mode' environment variable can be used to enable and configure | |
| 12 | some video drivers. The format matches the video= command-line option used | |
| 13 | for Linux: | |
| 14 | ||
| 15 | video-mode=<driver>:<xres>x<yres>-<depth>@<freq><,option=string> | |
| 16 | ||
| 17 | <driver> The video driver name, ignored by U-Boot | |
| 18 | <xres> The X resolution (in pixels) to use. | |
| 19 | <yres> The Y resolution (in pixels) to use. | |
| 20 | <depth> The color depth (in bits) to use. | |
| 21 | <freq> The frequency (in Hz) to use. | |
| 22 | <options> A comma-separated list of device-specific options | |
| 23 | ||
| 2dae800f HG |
24 | |
| 25 | U-Boot MPC8xx video controller driver | |
| 26 | ===================================== | |
| 27 | ||
| 28 | The driver has been tested with the following configurations: | |
| 29 | ||
| 30 | - MPC823FADS with AD7176 on a PAL TV (YCbYCr) - arsenio@tin.it | |
| 31 | ||
| a5dbdc81 | 32 | Example: video-mode=fslfb:1280x1024-32@60,monitor=dvi |
| 2dae800f HG |
33 | |
| 34 | ||
| 35 | U-boot sunxi video controller driver | |
| 36 | ==================================== | |
| 37 | ||
| 38 | U-boot supports hdmi and lcd output on Allwinner sunxi SoCs, lcd output | |
| 39 | requires the CONFIG_VIDEO_LCD_MODE Kconfig value to be set. | |
| 40 | ||
| 41 | The sunxi u-boot driver supports the following video-mode options: | |
| 42 | ||
| 43 | - monitor=[none|dvi|hdmi|lcd] - Select the video output to use | |
| 44 | none: Disable video output. | |
| 45 | dvi/hdmi: Selects output over the hdmi connector with dvi resp. hdmi output | |
| 46 | format, if edid is used the format is automatically selected. | |
| 47 | lcd: Selects video output to a LCD screen. | |
| 48 | vga: Selects bideo output over the VGA connector. | |
| 49 | Defaults to monitor=dvi. | |
| 50 | ||
| 51 | - hpd=[0|1] - Enable use of the hdmi HotPlug Detect feature | |
| 52 | 0: Disabled. Configure dvi/hdmi output even if no cable is detected | |
| 49d2703d | 53 | 1: Enabled. Fallback to the lcd / vga / none in that order (if available) |
| 2dae800f HG |
54 | Defaults to hpd=1. |
| 55 | ||
| 7fad8a98 HG |
56 | - hpd_delay=<int> - How long to wait for the hdmi HPD signal in milliseconds |
| 57 | When the monitor and the board power up at the same time, it may take some | |
| 58 | time for the monitor to assert the HPD signal. This configures how long to | |
| 59 | wait for the HPD signal before assuming no cable is connected. | |
| 60 | Defaults to hpd_delay=500. | |
| 61 | ||
| 2dae800f HG |
62 | - edid=[0|1] - Enable use of DDC + EDID to get monitor info |
| 63 | 0: Disabled. | |
| 64 | 1: Enabled. If valid EDID info was read from the monitor the EDID info will | |
| 65 | overrides the xres, yres and refresh from the video-mode env. variable. | |
| 66 | Defaults to edid=1. | |
| 67 | ||
| 68 | For example to always use the hdmi connector, even if no cable is inserted, | |
| 69 | using edid info when available and otherwise initalizing it at 1024x768@60Hz, | |
| 7fad8a98 | 70 | use: "setenv video-mode sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1". |