这个是mx51的uboot的环境变量，可以点量lcd屏。
BBG U-Boot > printenv
bootdelay=1
baudrate=115200
loadaddr=0x90800000
netdev=eth0
ethprime=FEC0
uboot_addr=0xa0000000
uboot=u-boot.bin
kernel=uImage
rd_loadaddr=0x90C00000
bootargs_nfs=setenv bootargs ${bootargs} root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp
prg_uboot=tftpboot ${loadaddr} ${uboot}; protect off ${uboot_addr} 0xa003ffff; erase ${uboot_addr} 0xa003ffff; cp.b ${loadaddr} ${uboot_addr} ${filesize}; setenv filesize; saveenv
bootcmd_SD=run bootargs_base bootargs_android;mmc read 0 ${loadaddr} 0x800 1800;mmc read 0 ${rd_loadaddr} 0x2000 0x258;bootm ${loadaddr} ${rd_loadaddr}
bootargs_android=setenv bootargs ${bootargs} androidboot.console=ttymxc0 init=/init di1_primary calibration
bootcmd_android_recovery=run bootargs_base bootargs_android_recovery;mmc read 0 ${loadaddr} 0x800 0x1800;bootm
bootargs_android_recovery=setenv bootargs ${bootargs} init=/init root=/dev/mmcblk0p4 rootfs=ext4 di1_primary
ethact=FEC0
ethaddr=00:11:18:00:09:00
filesize=2AE804
fileaddr=90800000
ipaddr=192.168.2.101
nfsroot=/tftpboot/mx51/
bootcmd_net=run bootargs_base bootargs_nfs;tftpboot ${loadaddr} ${serverip}:/tftpboot/${kernel}; bootm
serverip=192.168.2.100
bootargs=console=ttymxc0,115200 gpu_memory=16M androidboot.console=ttymxc0 init=/init di1_primary calibration
bootcmd=run bootcmd_net
bootargs_base=setenv bootargs console=ttymxc0,115200 gpu_memory=16M video=vfb:0
stdin=serial
stdout=serial
stderr=serial
Environment size: 1411/131068 bytes
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