i.MX Processors中的主题 Re: i.MX8QXP boot logo

i.MX8QXP boot logo

mod42 — Wed, 19 Jan 2022 14:16:54 GMT

We have a custom board with a display connected over LVDS to an iMX8QXP. When u-boot starts we show a logo bitmap from eMMC. After u-boot has loaded the kernel the display is switched of and comes back when weston is started. This causes the display to be black for a couple of seconds which is anything but nice. Is there any solution to this problem? We use our own BSP heavily based on the latest release 5.10.72_2.2.0.

Re: i.MX8QXP boot logo

Zhiming_Liu — Tue, 08 Feb 2022 02:15:32 GMT

You can custom your kernel logo during this black display.

Useful link: https://developer.toradex.com/knowledge-base/splash-screen-linux

Re: i.MX8QXP boot logo

josephzhou1 — Tue, 08 Feb 2022 02:28:35 GMT

yes

Re: i.MX8QXP boot logo

mod42 — Mon, 05 Sep 2022 12:30:18 GMT

We need display output as fast as possible so using the kernel logo feature is not quick enough. I got it now as far as having a valid dual channel LVDS output in uboot by patching imx8_lvds.c with support for the an aux ldb as it is done in the kernel. We tried to follow the path of what is done when fsl,dual-channel; is set in the kernel device tree.

But now we see a stretched image (only left half of uboot splashscreen is visible). Do you have any hint what can be done to fix this behavior?

Regards