Artesyn COMX-P4080 Installation and Use (August 2014) - Manual (Page 88)

BSP Operations
COMX-P4080 COM Express Module Installation and Use (6806800L20C) 88
7.4.7 Bootargs Variable
7.4.8 Bootup Variables
Bootargs Variable
root  root=/dev/ram for ramboot and norboot;
 'root=/dev/$jffs2nand rw’ for nandboot;
 root=/dev/nfs for nfsboot;
 'root=/dev/$usbbdev rw’ for usbfatboot and usbext2boot;
 oot=/dev/$mmcbdev rw’ for mmcfatboot and mmcext2boot
rootfstype ‘rootfstype=jffs2’ is needed for nandboot
rootdelay ‘rootdelay=30’ is needed for usb*boot and mmc*boot
console Default is ‘console=$consoledev,$baudrate’
hwbootargs Default is ‘riohdid=0 xauiphy=1’, generated by U-Boot based on hwcon-
fig.
othbootargs Default is ‘ramdisk_size=00700000 cache-sram-size=0x10000
Bootup Variables
ramboot Default is ‘setenv bootargs root=/dev/ram rw
console=$consoledev,$baudrate $hwbootargs $othbootargs;tftp
$ramdiskaddr $ramdiskfile;tftp $loadaddr $bootfile;tftp $fdtaddr
$fdtfile;bootm $loadaddr $ramdiskaddr $fdtaddr’
norboot Default is ‘setenv bootargs root=/dev/ram rw
console=$consoledev,$baudrate $hwbootargs $othbootargs;bootm
$norbootaddr $norfsaddr $norfdtaddr’
nandboot Default is ‘setenv bootargs root=/dev/$jffs2nand rw
console=$consoledev,$baudrate rootfstype=jffs2 $hwbootargs
$othbootargs;bootm $norbootaddr - $norfdtaddr’