How to make LCD work in u-boot v2020 for iMX6ULL?

[abdullahkahrama]

I am working on a custom board with an LCD on it. Kernel uses the LCD successfully, however u-boot doesn't show anything. I want to display at least some text on the LCD during u-boot.

I have done below defines and made the LCD pin additions to the dts file, however it didn't work, I see no backlight, when I override the backlight manually, I see no image on the LCD:

#define CONFIG_DM_VIDEO
#define CONFIG_VIDEO_PCI_DEFAULT_FB_SIZE  0

Here is what my printenv looks like:

baudrate=115200                                                                 
board_name=EVK                                                                  
board_rev=14X14                                                                 
boot_fdt=try                                                                    
bootcmd=run findfdt;mmc dev ${mmcdev};mmc dev ${mmcdev}; if mmc rescan; then if 
run loadbootscript; then run bootscript; else if run loadimage; then run mmcboot
; else run netboot; fi; fi; else run netboot; fi                                
bootdelay=2                                                                     
bootscript=echo Running bootscript from mmc ...; source                         
console=ttymxc0                                                                 
ethprime=eth1                                                                   
fdt_addr=0x83000000                                                             
fdt_file=undefined                                                              
fdt_high=0xffffffff                                                             
fdtcontroladdr=9ef95f50                                                         
findfdt=if test $fdt_file = undefined; then if test $board_name = ULZ-EVK && tes
t $board_rev = 14X14; then setenv fdt_file imx6ulz-14x14-evk.dtb; fi; if test $b
oard_name = EVK && test $board_rev = 14X14; then setenv fdt_file imx6ull-14x14-e
vk.dtb; fi; if test $fdt_file = undefined; then echo WARNING: Could not determin
e dtb to use; fi; fi;                                                           
image=zImage                                                                    
initrd_high=0xffffffff                                                          
ip_dyn=yes                                                                      
loadaddr=0x82000000                                                             
loadbootscript=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};          
loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}                
loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}                 
mmcargs=setenv bootargs console=${console},${baudrate} root=${mmcroot}          
mmcautodetect=yes                                                               
mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || tes
t ${boot_fdt} = try; then if run loadfdt; then bootz ${loadaddr} - ${fdt_addr}; 
else if test ${boot_fdt} = try; then bootz; else echo WARN: Cannot load the DT; 
fi; fi; else bootz; fi;                                                         
mmcdev=0                                                                        
mmcpart=1                                                                       
mmcroot=/dev/mmcblk0p2 rootwait rw                                              
netargs=setenv bootargs console=${console},${baudrate} root=/dev/nfs ip=dhcp nfs
root=${serverip}:${nfsroot},v3,tcp                                              
netboot=echo Booting from net ...; run netargs; if test ${ip_dyn} = yes; then se
tenv get_cmd dhcp; else setenv get_cmd tftp; fi; ${get_cmd} ${image}; if test ${
boot_fdt} = yes || test ${boot_fdt} = try; then if ${get_cmd} ${fdt_addr} ${fdt_
file}; then bootz ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; the
n bootz; else echo WARN: Cannot load the DT; fi; fi; else bootz; fi;            
panel=TFT43AB                                                                   
script=boot.scr                                                                 
stderr=serial                                                                   
stdin=serial                                                                    
stdout=serial                                                                   
videomode=video=ctfb:x:480,y:272,depth:24,pclk:108695,le:8,ri:4,up:2,lo:4,hs:41,
vs:10,sync:0,vmode:0                                                            
                                                                                
Environment size: 2143/8188 bytes     

My u-boot-fslc version is: v2020.10+gitAUTOINC+80c23498b4-r0

What should I do more? Is LCD driver for u-boot not supported?

[igorpadykov]

Hi Abdullah

one can look at below dts example and enable lcdif

https://source.codeaurora.org/external/imx/uboot-imx/tree/arch/arm/dts/imx6ull-14x14-ddr3-val.dts?h=...

Best regards
igor