X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=doc%2FREADME.video;h=ced35bd2db55dcb3781dd333e909395334e51b59;hb=1fa6305fd605635781b66abd5c6170ee29624743;hp=d0a3ad6e8d455f52843778a93aa7a760f66c1b65;hpb=ab77f24119e80257de4ab017b877f92f96980562;p=oweals%2Fu-boot.git diff --git a/doc/README.video b/doc/README.video index d0a3ad6e8d..ced35bd2db 100644 --- a/doc/README.video +++ b/doc/README.video @@ -1,8 +1,7 @@ +SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2000 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it - * - * SPDX-License-Identifier: GPL-2.0+ */ "video-mode" environment variable @@ -32,20 +31,23 @@ The driver has been tested with the following configurations: Example: video-mode=fslfb:1280x1024-32@60,monitor=dvi -U-boot sunxi video controller driver +U-Boot sunxi video controller driver ==================================== -U-boot supports hdmi and lcd output on Allwinner sunxi SoCs, lcd output +U-Boot supports hdmi and lcd output on Allwinner sunxi SoCs, lcd output requires the CONFIG_VIDEO_LCD_MODE Kconfig value to be set. -The sunxi u-boot driver supports the following video-mode options: +The sunxi U-Boot driver supports the following video-mode options: -- monitor=[none|dvi|hdmi|lcd] - Select the video output to use +- monitor=[none|dvi|hdmi|lcd|vga|composite-*] - Select the video output to use none: Disable video output. dvi/hdmi: Selects output over the hdmi connector with dvi resp. hdmi output format, if edid is used the format is automatically selected. lcd: Selects video output to a LCD screen. - vga: Selects bideo output over the VGA connector. + vga: Selects video output over the VGA connector. + composite-pal/composite-ntsc/composite-pal-m/composite-pal-nc: + Selects composite video output, note the specified resolution is + ignored with composite video output. Defaults to monitor=dvi. - hpd=[0|1] - Enable use of the hdmi HotPlug Detect feature @@ -65,6 +67,31 @@ The sunxi u-boot driver supports the following video-mode options: overrides the xres, yres and refresh from the video-mode env. variable. Defaults to edid=1. +- overscan_x/overscan_y= - Set x/y overscan value + This configures a black border on the left and right resp. top and bottom + to deal with overscanning displays. Defaults to overscan_x=32 and + overscan_y=20 for composite monitors, 0 for other monitors. + For example to always use the hdmi connector, even if no cable is inserted, using edid info when available and otherwise initalizing it at 1024x768@60Hz, use: "setenv video-mode sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1". + + +TrueType fonts +-------------- + +U-Boot supports the use of antialiased TrueType fonts on some platforms. This +has been tested in x86, ARMv7 and sandbox. + +To enable this, select CONFIG_CONSOLE_TRUETYPE. You can choose between several +fonts, with CONSOLE_TRUETYPE_NIMBUS being the default. + +TrueType support requires floating point at present. On ARMv7 platforms you +need to disable use of the private libgcc. You can do this by disabling +CONFIG_USE_PRIVATE_LIBGCC. See chromebook_jerry for an example. Note that this +increases U-Boot's size by about 70KB at present. + +On ARM you should also make sure your toolchain supports hardfp. This is +normally given in the name of your toolchain, e.g. arm-linux-gnueabihf (hf +means hardware floating point). You can also run gcc with -v to see if it has +this option.