Artesyn COMX-P4080 Installation and Use (August 2014) - Manual (Page 114)

BSP Operations
COMX-P4080 COM Express Module Installation and Use (6806800L20C) 114
The following are the critical environment variables for "ramboot":
The following are examples of critical environment variables.
7.19.2 NORboot
COMX-P4080 has a U-Boot variable called "norboot"
setenv bootargs root=/dev/ram rw console=$consoledev,$baudrate
$hwbootargs $othbootargs;bootm $norbootaddr $norfsaddr $norfdtaddr
"norboot" will load RAMDISK, Linux kernel and DTB from NOR Flash into RAM then boot.
The following are the critical environment variables for "norboot".
ethact - Active ethernet port
ramdiskfile - RAMDISK file name on TFTP server
bootfile - Linux kernel file name on TFTP server
fdtfile - DTB file name on TFTP server
=> setenv ethact FM1@DTSEC1
=> setenv ramdiskfile comx_p4080/COMX_P4080_V100R00/rootfs_ext2.img
=> setenv bootfile comx_p4080/COMX_P4080_V100R00/uImage
=> setenv fdtfile comx_p4080/COMX_P4080_V100R00/comx.dtb
norfsaddr - RAMDISK address on NOR FLASH
norbootaddr - Linux kernel address on NOR FLASH
norfdtaddr - DTB address on NOR FLASH