uEnv.txt

console=ttyO0,115200n8
ipaddr=192.168.9.2
serverip=192.168.9.1
ethact=usb_ether
usbnet_devaddr=f8:dc:7a:00:00:02
usbnet_hostaddr=f8:dc:7a:00:00:01
loadbootenv_network=tftpboot ${loadaddr} ${serverip}:uEnv.txt
get_tftp_uEnv=tftpboot ${loadaddr} ${serverip}:uEnv.txt; fatwrite mmc 0:1 ${loadaddr} uEnv.txt ${filesize}
get_tftp_spl=tftpboot ${loadaddr} ${serverip}:MLO; fatwrite mmc 0:1 ${loadaddr} MLO ${filesize}
get_tftp_uboot=tftpboot ${loadaddr} ${serverip}:u-boot.img; fatwrite mmc 0:1 ${loadaddr} u-boot.img ${filesize}
rootpath=/srv/nfs/bbb,nolock,wsize=1024,rsize=1024,nfsvers=3 rootwait rootdelay=3
loadtftp=echo Booting from network ...;tftpboot ${loadaddr} ${serverip}:uImage; tftpboot ${fdtaddr} ${serverip}:am335x-boneblue.dtb
netargs=setenv bootargs console=${console} g_ether.dev_addr=${usbnet_devaddr} g_ether.host_addr=${usbnet_hostaddr} root=/dev/nfs rw nfsroot=${serverip}:${rootpath} ip=${ipaddr}:::::usb0
mmc0_args=setenv bootargs console=${console} root=/dev/mmcblk0p2 rw rootfstype=ext2 rootwait debug earlyprintk mem=512M
load_mmc0=load mmc 0:2 ${loadaddr} /boot/uImage ; load mmc 0:2 ${fdtaddr} /boot/am335x-boneblue.dtb 
mmc1_args=setenv bootargs console=${console} root=/dev/mmcblk1p2 rw rootfstype=ext2 rootwait debug earlyprintk mem=512M
load_mmc1=load mmc 1:2 ${loadaddr} /boot/uImage ; load mmc 1:2 ${fdtaddr} /boot/am335x-boneblue.dtb 
uenvcmd_net=echo Booting from Network ...;setenv autoload no; run loadtftp; run netargs; bootm ${loadaddr} - ${fdtaddr}
uenvcmd_mmc0=echo Booting from microSD ...; setenv autoload no ;run load_mmc0; run mmc0_args; bootm ${loadaddr} - ${fdtaddr}
uenvcmd_mmc1=echo Booting from eMMC ...; setenv autoload no ;run load_mmc1; run mmc1_args; bootm ${loadaddr} - ${fdtaddr}
uenvcmd=run uenvcmd_mmc0