![]() ![]() + panel_info.cmap=malloc(256 * NBITS(panel_info. gd->fb_base = msg_setup->allocate_address ![]() So the cmap is fill at 0x0 and lot’s of essential data like device tree too (at 0x100) is overwritten. It makes calls to routines in board.c to set up the LCDC and frame buffer. There is a frame buffer driver for am335x in the drivers/video directory called am3355x-fb.c. All the code below is based on Processor Linux SDK 03.02.00.05. The panel_info.cmap is not allocated and have a NULL value. U-Boot Splash Screen¶ Adding a splash screen. If you want use the Splash screen of bitmap display in bootmap, there is a bug in the video driver. As mentioned earlier the splash screen displayed by the uboot is maintained by the kernel only till DRM device gets configured by userspace application. To disable the splash screen, enter the following in the U-Boot command line interface: > run disablesplash > saveenv & reset And to re-enable it: > run enablesplash > saveenv & reset The splash image is taken from /boot/splash.bmp in the root file system. Hi a little (headache) contributed from me: A splash screen is enabled by default, and is shown on the LVDS LCD. One of the replies written in this thread suggests that raspberry pi’s default address configuration is messed up in a way that the display driver will corrupt other critical memory regions whenever it will try to show something up on the display. raspberry display related address is messed up In order to this to work properly, one must also turn on other ‘CONFIG_’s as well.Ģ. One must manually add ‘CONFIG_CMD_BMP’ configuration.įurther digging suggested that enabling ‘CONFIG_CMD_BMP’ alone is not enough. However, this command is not included in the default uboot. Apparently, this is the command that will display a bmp image file to the display. I think there are two problems that I should tackleįrom various uboot splashscreen tutorials, most of them utilize a ‘bmp’ command. The failure with displaying a picture on the display with uboot seems to be a complicated matter. wanted to display some picture or whatever with uboot.succeeded adding a very simple custom command in uboot.Made some changes in the ‘config.txt’ file in /boot partition of the rpi sd card so that I can access the uboot prompt through UART communication. confirmed that the vanilla build works well with rpi2.fortunately, rpi2 build works very well.some setting with the compilers seems to be off. tried to build a uboot image for rpi3.4.2.1) and upload via TFTP the splash screen on a TX CoM. 2.2.3.1, Step 8(a)).įollowing shows examples how to partition (NAND), activate, position (optional, Ch. 3 ff.īetween a TX CoM using NAND and one using eMMC users have to follow slightly different procedures:Īfter setting up the U‑Boot environment for display output (see video_mode), the splash screen can be loaded into the NAND or eMMC like any other file (see e.g.: Ch. Resolution maximum depends on the capabilities of TX COM.Īny unused space around the picture will be set to an all white background. TorizonCore The customization of the kernel splash screen on Torizon is currently not covered as a use case. By default, Toradex images display our logo. Using a splash screen isn’t specific to Nitrogen, though, and since it’s a really common question and because the file. The linux kernel then should initialize the framebuffer and display the splash screen. The kernel splash screen is a picture loaded by the Linux kernel during the early boot process. To disable the splash screen, enter the following in the U-Boot command line interface: > run splashdisable > saveenv & reset And to re-enable it: > run splashenable > saveenv & reset The splash image is taken from /boot/splash.bmp in the root file system. Buried in the blog post introducing display support for U-Boot, there are some notes about creating splash screens for the boot loader on Nitrogen boards. Requirements and restrictions for an active splash image: I would like to disable my display as long as uboot is active, because the display isn’t correctly initialized and actually I simply do not need in this stage. Screen/splash image feature is built‑in, but not active. In the standard Ka‑Ro release installation the boot splash Screen/splash image being defined which is loaded from a NAND or eMMC In the factory configuration U‑Boot displays a boot logo which is compiled-in Users who want to add a configuration for a custom display please refer to: "/Datasheets/Display/*.pdf" on the CD and/or the products download site. Following a short list of available (pre-defined) modes as available by the Ka-Ro ![]()
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