这是env.cfg
#kernel command arguments #rootfstype=ubifs,rw
earlycon=uart8250,mmio32,0x02501400
initcall_debug=0
console=ttyS5,115200
nand_root=ubi0_5
mmc_root=/dev/mmcblk1p5
mtd_name=sys
rootfstype=ext4
init=/init
loglevel=8
cma=16M
mac=
wifi_mac=
bt_mac=
specialstr=
keybox_list=widevine,ec_key,ec_cert1,ec_cert2,ec_cert3,rsa_key,rsa_cert1,rsa_cert2,rsa_cert3
dsp0_partition=dsp0
#set kernel cmdline if boot.img or recovery.img has no cmdline we will use this
setargs_nand=setenv bootargs ubi.mtd=${mtd_name} earlycon=${earlycon} clk_ignore_unused initcall_debug=${initcall_debug} rootwait console=${console} loglevel=${loglevel} root=${nand_root} rootfstype=${rootfstype} init=${init} partitions=${partitions} cma=${cma} snum=${snum} mac_addr=${mac} wifi_mac=${wifi_mac} bt_mac=${bt_mac} specialstr=${specialstr} gpt=1
setargs_nand_ubi=setenv bootargs ubi.mtd=${mtd_name} earlycon=${earlycon} clk_ignore_unused initcall_debug=${initcall_debug} rootwait console=${console} loglevel=${loglevel} root=${nand_root} rootfstype=${rootfstype} init=${init} partitions=${partitions} cma=${cma} snum=${snum} mac_addr=${mac} wifi_mac=${wifi_mac} bt_mac=${bt_mac} specialstr=${specialstr} gpt=1
setargs_mmc=setenv bootargs earlycon=${earlycon} clk_ignore_unused initcall_debug=${initcall_debug} console=${console} loglevel=${loglevel} root=${mmc_root} rootfstype=${rootfstype} init=${init} partitions=${partitions} cma=${cma} snum=${snum} mac_addr=${mac} wifi_mac=${wifi_mac} bt_mac=${bt_mac} specialstr=${specialstr} gpt=1
#nand command syntax: sunxi_flash read address partition_name read_bytes
#0x4007f800 = 0x40080000(kernel entry) - 0x800(boot.img header 2k)
boot_dsp0=sunxi_flash read 43000000 ${dsp0_partition};bootr 43000000 0 0
boot_normal=sunxi_flash read 43000000 boot;bootm 43000000
boot_recovery=sunxi_flash read 43000000 recovery;bootm 43000000
boot_fastboot=fastboot
#uboot system env config
bootdelay=1
#default bootcmd, will change at runtime according to key press
#default nand boot
bootcmd=run setargs_mmc boot_dsp0 boot_normal
