Artesyn COMX-P4080 Installation and Use (August 2014) - Manual (Page 116)

BSP Operations
COMX-P4080 COM Express Module Installation and Use (6806800L20C) 116
setenv bootargs root=/dev/nfs rw nfsroot=$serverip:$rootpath
ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname:$netdev:off
console=$consoledev,$baudrate $hwbootargs $othbootargs;tftp
$loadaddr $bootfile;tftp $fdtaddr $fdtfile;bootm $loadaddr -
$fdtaddr
The "nfsboot" will load Linux kernel and DTB into RAM via network by TFTP and then boot. NFS
will then mount on the remote server as rootfs.
The following are the critical environment variables for "nfsboot".
Below are examples of critical environment variables.
7.19.5 USBFATboot and USBEXT2boot
COMX-P4080 has a U-Boot variable called "usbfatboot".
setenv bootargs root=/dev/$usbbdev rw rootdelay=30
console=$consoledev,$baudrate $hwbootargs $othbootargs;usb
start;fatload usb 0:1 $loadaddr /boot/$bootfile;fatload usb 0:1
$fdtaddr /boot/$fdtfile;bootm $loadaddr - $fdtaddr
COMX-P4080 has a U-Boot variable called "usbext2boot".
ethact - Active ethernet port
netdev - The NFS mounting network port
bootfile - Linux kernel file name on TFTP server
fdtfile DTB file name on TFTP server
rootpath The NFS path the remote server exports
=> setenv ethact FM1@DTSEC1
=> setenv netdev eth0
=> setenv bootfile comx_p4080/COMX_P4080_V100R00/uImage
=> setenv fdtfile comx_p4080/COMX_P4080_V100R00/comx.dtb
=> setenv rootpath /tftpboot/comx_p4080/rootfs_nfs