How to use a splash screen with VisionSOM-6ULL
From SomLabs Wiki
How to use a splash screen with VisionSOM-6ULL
Prerequisites
- PC with Microsoft Windows 10 64-bit OS or Linux Ubuntu 16.04+ (only for flashing NAND memory)
- A complete package with NXP UUU application (only for flashing NAND memory) - ftp.somlabs.com/Tools/somlabs-visionsom-flasher.zip
- splash.bmp - splash screen bitmap file (from the complete package above or generated by yourself)
Information
- SoMLabs solution is based on NXP UUU tool (Universal Update Utility), with some extensions added on top of it to easly handle SoMLabs boards.
- Please note also, that file can be located in any directory - you need to specify complete file path then.
- If you are using VisionSOM module with i.MX6UL processor, please change in commands given below '6ull' to '6ul'
- Default NAND paritions layout for 4M boot variant (remaining NAND area is used for root file system by default):
Splash screen bitmap file
A maximum size of splash image file is 800x480px (equal to SL-TFT7-TP-800-480-P display resolution), bpp shall be 24-bit or 8-bit with pallete. Image shall be stored as .bmp file. Please ensure that file size must be smaller than 1MB.
Preparing for flashing splash screen to NAND memory
For programming NAND memory of VisionSOM-6ULL, switch boot selector to mode: SERIAL.
| BOOTx | Boot Mode | |
|---|---|---|
| BOOT1 | BOOT0 | |
| 1 | 1 | Reserved |
| 1 | 0 | Internal |
| 0 | 1 | Serial |
| 0 | 0 | Fuses |
Connect the VisionCB-6ULL-STD board to the host PC using microUSB cable connected to the USB-OTG connector. To observe progress/error reports during programming, please use serial console. If you are using standard VisionSOM carrier board (VisionCB-6ULL-STD), this can be done by using build in serial/usb converter.
Flashing splash screen to NAND (from Windows host machine)
Run command:
uuu.exe -b vsom_6ull_nand_splash splash.bmp
Flashing splash screen to NAND (from Linux host machine)
Make UUU executable:
chmod 755 uuu
Run command:
sudo ./uuu -b vsom_6ull_nand_splash splash.bmp
| Be aware if any of erase blocks in 'splash' partition are bad, then max. size of splash screen will be smaller. To meet the size limit, it is possible to compress a bitmap file with gzip and write compressed file to NAND. |
Flashing splash screen to eMMC/SD card
There is no need to perform any additional step to program custom splash image - for applying a splash screen, simply put prepared 'splash.bmp' file into '/boot' directory of the root file system. Please ensure if u-boot on your SD card image supports splash screen displaying.
