Here all supported Libreelec granted you =)
LibreELEC:~ # fw_printenv
baudrate=115200
bcb_cmd=bcb uboot-command;
boardname=m8_board
bootcmd=run start_autoscript; run storeboot
bootdelay=1
bootfile=boot.img
bootfromnand=0
bootfromrecovery=0
bootm_low=0x00000000
bootm_size=0x80000000
bootpath=u-boot.bin
bootsize=100000
bootstart=0
check_rebootmode=get_rebootmode; clear_rebootmode; echo reboot_mode=${reboot_mode};if test ${reboot_mode} = factory_reset; then defenv; fi;
chipname=8726m8
console=ttyS0,115200n8
cvbs_drv=0
cvbsmode=576cvbs
display_bpp=24
display_color_bg=0
display_color_fg=0xffff
display_color_format_index=24
display_height=1080
display_layer=osd2
display_width=1920
ethaddr= xxx
factory_reset_poweroff_protect=echo wipe_data=${wipe_data}; echo wipe_cache=${wipe_cache};if test ${wipe_data} = failed; then run prepare; run storeargs; run recovery;fi; if test ${wipe_cache} = failed; then run prepare; run storeargs; run recovery;fi;
fb_addr=0x07900000
fb_height=720
fb_width=1280
firstboot=1
gatewayip=10.18.9.1
get_dt=checkhw
hdmimode=1080p
hostname=arm_m8
initargs=rootfstype=ramfs init=/init console=ttyS0,115200n8 no_console_suspend earlyprintk ramoops.mem_address=0x04e00000 ramoops.mem_size=0x100000 ramoops.record_size=0x8000 ramoops.console_size=0x4000 androidboot.selinux=permissive storage=2
initrd_high=60000000
ipaddr=10.18.9.97
loadaddr=0x12000000
loadaddr_logo=0x13000000
netmask=255.255.255.0
normalsize=400000
normalstart=1000000
outputmode=1080p
p0path=uImage
p0size=400000
p0start=1000000
p1path=android.rootfs
p1size=8000000
p1start=1400000
partnum=2
preboot=run factory_reset_poweroff_protect;if itest ${upgrade_step} == 3; then run prepare; run storeargs; run update; fi; if itest ${upgrade_step} == 1; then defenv_reserve_env; setenv upgrade_step 2; saveenv;fi; run check_rebootmode;run prepare;run storeargs;run update_key; run switch_bootmode
preloaddtb=imgread dtb boot ${loadaddr}
prepare=logo size ${outputmode}; video open; video clear; video dev open ${outputmode};imgread res logo ${loadaddr_logo}; unpackimg ${loadaddr_logo}; logo source ${outputmode}; bmp display ${bootup_offset}; bmp scale;
reboot_mode=normal
recovery=echo enter recovery;run bcb_cmd; setenv bootargs ${bootargs} wipeinstaboot;if mmcinfo; then if fatload mmc 0 ${loadaddr} recovery.img; then bootm;fi;fi; if usb start 0; then if fatload usb 0 ${loadaddr} recovery.img; then bootm; fi;fi;if imgread kernel recovery ${loadaddr}; then bootm; else echo no recovery in flash; fi;
sdc_burning=sdc_burn ${sdcburncfg}
sdcburncfg=aml_sdc_burn.ini
serverip=10.18.9.113
start_autoscript=if mmcinfo; then run start_mmc_autoscript; fi; if usb start; then run start_usb_autoscript; fi
start_mmc_autoscript=if fatload mmc 0 11000000 s805_autoscript; then autoscr 11000000; fi
start_usb_autoscript=if fatload usb 0 11000000 s805_autoscript; then autoscr 11000000; fi
store=2
storeargs=setenv bootargs ${initargs} cvbsdrv=${cvbs_drv} vdaccfg=${vdac_config} logo=osd1,loaded,${fb_addr},${outputmode},full hdmimode=${hdmimode} cvbsmode=${cvbsmode} androidboot.firstboot=${firstboot} hdmitx=${cecconfig}
storeboot=if test ${reboot_mode} = charging; then run try_auto_burn; fi;secukey auto;secukey write keyexample 1234567890; echo Booting...; run bcb_cmd; if unifykey get usid; then setenv bootargs ${bootargs} androidboot.serialno=${usid};fi;if unifykey get mac; then setenv bootargs ${bootargs} mac=${mac};fi;imgread kernel boot ${loadaddr};bootm;run recovery
switch_bootmode=if test ${reboot_mode} = factory_reset; then run recovery;else if test ${reboot_mode} = update; then run update;else if test ${reboot_mode} = usb_burning; then run usb_burning;else if test ${wipe_data} = failed; then echo wipe_data=${wipe_data}; run recovery;else fi;fi;fi;fi
testaddr=0x12400000
try_auto_burn=update 700 750;
update=run usb_burning; if mmcinfo; then if fatexist mmc 0 ${sdcburncfg}; then run sdc_burning; else if fatload mmc 0 ${loadaddr} aml_autoscript; then autoscr ${loadaddr}; fi;run recovery;fi;else run recovery;fi;
update_key=saradc open 0; if saradc get_in_range 0 0x50; then msleep 50; if saradc get_in_range 0 0x50; then echo update by key...; run update; fi;fi
upgrade_step=0
us_delay_step=1
usb_burning=update 1000
vdac_config=0x10
video_dev=tvout
wipe_cache=successful
wipe_data=successful