- U boot splash driver#
- U boot splash android#
- U boot splash code#
For those wishing to suppress any sort of splash screen, removing these configs will disable all U-Boot video support. Enable support for display of Linux logo in upper left corner.īefore continuing, ensure that they are defined otherwise the following methods will not function as intended. Define this to enable video support ( for output to video ). Enables console device for a color framebuffer. For more information see the ventana/bootloader wiki.īy default, the Ventana bootloader has the following splash screen related configs defined in u-boot-im圆/include/configs/gw_ventana.h. In order to implement any of the aforementioned you will need access to a U-Boot build system.
Load BMP from storage using environmentīootloader Splash Screen Method Comparison:. The methods available to Ventana's U-boot are as follows: However, there currently exists a small number of methods to configure the bootloader's splash screen. Being mainly responsible for configuring the DRAM controller and loading/executing the OS kernel, the bootloader's support for displays is rudimentary. if you want visual feedback all along the way you may want to implement a bootloader splash, a kernel splash, and a userspace splashĪs previously mentioned, the first opportunity to display a splash screen becomes available at the start of bootloader execution. U boot splash android#
if your intention is to have a splash up until the moment that you can interact with the Android GUI then you at least have to use a userspace spash (for Android this is best done via the bootanimation.zip). if your intention is to provide feedback within the first 2 seconds then you'll get the most bang-for-your buck using a kernel splash. if your intention is to provide feedback within the first second of power-up then you must do this in the bootloader (but be aware it will not persist for more than 1.5 seconds or so. Times shown are for the default development configuration without boot speed tuning.įrom the above timelines you can see where it may be most useful to implement a splash screen. Note: Times will vary depending based on hardware, OS, and configuration. Finally, depending on the operating system, a dynamic animated splash may be enabled in early userspace init which leads to a GUI if available once init is complete. This image can be switched out or left in place by the kernel. The first place a splash screen can be configured is the bootloader where typically a static splash is displayed. For example, the IMX6 processor used on Ventana boards starts with a Primary Boot Loader (PBL) (this is firmware inside the IMX6 which can not be modified), a Secondary Program Loader (SPL) which configures DRAM and loads the main bootloader, then the OS kernel itself. This page covers the various splash screen options available to Ventana products as well as instructions for customization.įor each step in the typical boot process, a splash screen can usually be configured for the duration of its operation. All for minimal impact on overall system boot time. This provides a sense of responsiveness for those expecting a visual effect on power up while at the same time providing an avenue for the prominent display of a vendor logo. Boot Animation - Does not Require Building Android Sourceįor devices that have a display, customers may often want to present a splash-screen as soon as possible. U boot splash code#
Init Logo - Requires Building of Android Source Code.I just wanted to let you know what I've learned while investigating this issue for myself. I'm sorry I don't have a direct answer to your question.
U boot splash driver#
I've also discovered that the firmware does not pass the color depth information to the vc4 driver, so you end up with a 32-bit buffer at boot, but a 16 bit buffer after the vc4 driver takes over. I'd be interested in knowing if it would actually work. I don't know if `CONFIG_FB_PRE_INIT_FB` would accomplish what you. The splash screen will still disappear, but will do so for a much shorter time. The best I've been able to accomplish is to add a systemd service like this `WantedBy` `sysinit.target` and `After` `sysinit.target` to re-display the splash screen on the frame buffer.
You can also see in the `/var/log/kernel.log` file that the splash screen disappearing coincides with the `fb0: switching to vc4 from simple` log entry. If you remove the `dtoverlay=vc4-kms-v3d` from your config file, you'll see that the spash screen remains, but you'll sacrifice the accelerated KMS driver. It is my understanding that the initial splash screen disappears because the vc4 driver takes over.
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