scriptaddr=0x83000000
device=mmc
bootenv=uEnv.txt
kernel=uImage
loadaddr=0x80200000
#default bootargs will be overidden by buildargs
bootargs=console=ttyS2,115200 root=/dev/mmcblk1p2 rw rootwait ip=dhcp

console=earlyprintk console=ttyS2,115200 console=tty1 fbcon=map:0
roottmpl=${rootdev} rootfstype=ext4 rootwait
prepsetroot=setenv setroot setenv root ${roottmpl}
bootopts=vmalloc=496M debug=7 initcall_debug=0
graphic=video=1920x1080 drm.debug=0x7

buildargs=setenv bootargs "console=${console} root=${root} ${bootopts} ${graphic}"

checkenv=test -e ${device} ${partition} ${bootenv}
importenv=env import -t ${scriptaddr} ${filesize}
loadbootenv=if fatload ${device} ${partition} ${scriptaddr} ${bootenv};then run importenv;else echo "fatload (${bootenv}) failed";fi
resetenv=env default -a;printenv;

# Here we assume that SD card id mmcblk1 and eMMC is mmcblk0 in linux. Swap them if your DTS define them in reverse order.
usesd=setenv partition 1:1; setenv rootdev /dev/mmcblk1p2; setenv bootdev SD; setenv swaproot 'run useemmc';
useemmc=setenv partition 0:1; setenv rootdev /dev/mmcblk0p2; setenv bootdev eMMC; setenv swaproot 'run usesd';

checkbootedfrom=if itest.l *81dffff0 == 434d4d65 ; then setenv bootedfrom eMMC; else setenv bootedfrom SD; fi;

checkroot=fatinfo ${device} ${partition}
checksd=fatinfo ${device} 1:1
checkmmc=fatinfo ${device} 0:1

reportbootedfrom=echo "Preloader/U-Boot loaded from ${bootedfrom}."; run validroot || echo "Both SD and eMMC pt#1 are not FAT, falling back to U-Boot shell."
reportvalidroot=run validroot || echo "Both SD and eMMC pt#1 are not FAT, falling back to U-Boot shell."
reportrootswapwarn=if test "${bootedfrom}" != "${bootdev}" ; then echo "Warning: Partition 1 on ${bootedfrom} is not FAT, failing back to ${bootdev}"; fi; true;
reportbootdev=echo "Booting from ${bootdev}."
reportboot=run reportbootedfrom reportvalidroot reportrootswapwarn reportbootdev

detectroot=run useemmc; run checkbootedfrom; if test "${bootedfrom}" == "SD"; then run usesd; fi; run validateroot;
validateroot=setenv validroot false; run checkroot || run swaproot; run checkroot && setenv validroot true || run swaproot;

newboot=run prepsetroot; run setroot;run buildargs;printenv bootargs;fatload ${device} ${partition} ${loadaddr} ${kernel}; bootm

reloadenv=run detectroot; if run validroot; then if run checkenv; then run loadbootenv; run detectroot; else echo uEnv.txt file not found on ${bootdev}; fi; fi;
reloadmenu=run reloadenv; run reportboot; if run validroot; then if run checkenv; then run loadbootenv; else echo uEnv.txt file not found on ${bootdev}; fi; bootmenu; fi;

lskernel=ls ${device} ${partition};
lsdtb=ls ${device} ${partition} dtb
askkernel=askenv kernelinput "enter uImage-name:";
askdtb=askenv dtbinput "enter dtb-name:";

#bootmenu
boot0=run lskernel;run askkernel;if printenv kernelinput ;then setenv kernel ${kernelinput};run lsdtb;run askdtb;if printenv dtbinput ;then setenv fdt ${dtbinput};fi; run newboot2; fi;
boot1=run newboot;

bootmenu_default=2
bootmenu_0=1. Enter kernel-name to boot from SD/EMMC.=run boot0
bootmenu_1=2. Boot kernel from TFTP.=run bootnet
bootmenu_2=3. Boot from SD/EMMC.=run boot1
bootmenu_3=4. Boot from eMMC.=run useemmc; run boot1
bootmenu_4=5. Boot from SD.=run usesd; run boot1

#Netboot
ipaddr=192.168.0.11
netmask=255.255.255.0
serverip=192.168.0.10

bootfile=uImage
netbootargs=console=ttyS2,115200 root=/dev/mmcblk1p2 rw rootwait
#ip=dhcp sets ip on eth0 instead of wan

lstftp=tftp ${loadaddr} ${serverip}:files.lst;setexpr listend ${loadaddr} + ${filesize};mw.b ${listend} 00 2;strings ${loadaddr};
#md.b ${loadaddr} 60;

bootnet=run lstftp;run askkernel;if printenv kernelinput ;then setenv bootfile "${kernelinput}"; fi;printenv; setenv bootargs ${netbootargs};tftp ${loadaddr} ${bootfile};bootm

#separate fdt+dto
dtaddr=0x83f00000
fdt_high=0xffffffff

loadfdt=fatload ${device} ${partition} ${dtaddr} dtb/${fdt}
loadkernel=echo "loading kernel ${kernel}...";fatload ${device} ${partition} ${loadaddr} ${kernel}

loaddto=echo "loaddto:${dto}";fdt addr ${dtaddr};fdt resize 8192; setexpr fdtovaddr ${dtaddr} + F000;fatload ${device} ${partition} ${fdtovaddr} dtb/${dto} && fdt apply ${fdtovaddr}
loaddtolist=for dto in ${dtolist} ; do run loaddto ; done

bootall=if printenv fdt; then run loadfdt; if printenv dtolist;then run loaddtolist;fi; bootm ${loadaddr} - ${dtaddr} ;else bootm; fi
newboot2=run prepsetroot; run setroot;run buildargs; printenv bootargs; run loadkernel; run bootall;

#automatic reload from sd/emmc
bootdelay=0
bootcmd=setenv bootdelay 3; run reloadmenu;