board: rpi4: Add splashscreen on boot

Show splash in uboot.

Author: mattiaswal

board/common/uboot/splash.bmp

@@ -13,9 +13,11 @@ device_tree=bcm2711-rpi-4-b.dtb
 dtoverlay=rpi-env
 dtoverlay=infix-key
 dtoverlay=vc4-kms-v3d-pi4
-dtoverlay=vc4-kms-dsi-7inch
+lcd_rotate=2
 
-#ignore_lcd=0
+
+# Prevent console on DSI
+console=map:0
 
 # To use an external initramfs file
 #initramfs rootfs.cpio.gz

src/board/raspberry-pi-4/config.txt

@@ -1,3 +1,11 @@
 # CONFIG_MMC_PCI is not set
 CONFIG_OF_OVERLAY_LIST="rpi-env infix-key"
 # CONFIG_ENV_IS_IN_FAT is not set
+CONFIG_CMD_BMP=y
+CONFIG_CMD_RPI_DISPLAY=y
+CONFIG_SPLASH_SCREEN=y
+CONFIG_SPLASH_SCREEN_ALIGN=y
+CONFIG_BMP=y
+CONFIG_BMP_24BPP=y
+CONFIG_VIDEO=y
+CONFIG_VIDEO_BMP_RLE8=y

src/board/raspberry-pi-4/uboot/extras.config

@@ -11,7 +11,14 @@
 			bootmenu_delay = "10";
 			boot_targets = "mmc0";
 			ethprime = "eth0";
-			bootcmd = "run ixboot";
+
+			stdout = "serial";
+			stderr = "serial";
+			stdin = "serial";
+			splashpos = "m,m";
+			splashfile = "splash.bmp";
+			checkdisplay = "if testrpidisplay; then; setenv fdtfile broadcom/bcm2711-rpi-4-b-dsi.dtb; else; setenv fdtfile broadcom/bcm2711-rpi-4-b.dtb; fi";
+			bootcmd = "fatload mmc 0:1 ${loadaddr} ${splashfile}; bmp display ${loadaddr}; run checkdisplay; run ixboot";
 
 			ixpreboot     = /incbin/("scripts/ixpreboot.sh");
 			ixbtn-devmode = "setenv dev_mode yes; echo Enabled";