Artesyn COMX-P40x0 ENP2, Manual

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COMX-P40x0 ENP2 Installation and Use (6806800R95B )
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7.23.1 RAMboot
COMX-P40x0 has a U-Boot variable called "ramboot".
setenv bootargs root=/dev/ram rw console=$consoledev,$baudrate
$hwbootargs $othbootargs;tftp $ramdiskaddr $ramdiskfile;tftp
$loadaddr $bootfile;tftp $fdtaddr $fdtfile;bootm $loadaddr
$ramdiskaddr $fdtaddr
"ramboot" will first load RAMDISK, Linux kernel and DTB into RAM through network by TFTP
then boot.
The following are the critical environment variables for "ramboot":
The following are examples of critical environment variables.
7.23.2 NORboot
COMX-P40x0 has a U-Boot variable called "norboot"
setenv bootargs root=/dev/ram rw console=$consoledev,$baudrate
$hwbootargs $othbootargs;bootm $norbootaddr $norfsaddr $norfdtaddr
"norboot" will load RAMDISK, Linux kernel and DTB from NOR Flash into RAM then boot.
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