User manual

Linux Guide taskit GmbH
11.3. U-Boot environment variables
A description of all important environment variables used by U-Boot follows.
11.3.1. Environment variables for Portux 920t EU + SW, Portux-MiniPC,
Portux Panel-PC and Stamp
basicargs contains the static boot arguments
default: console=ttyS0,115200 mem=64M root=/dev/ram rw
baudrate defines the baudrate of the serial interface
default: 115200
bootargs parameters / settings passed to the kernel when booting
default: \$(basicargs) initrd=0x\$(fileaddr),0x\$(filesize)
\$(mtdparts)\;bootm \$(kerneladdr)
bootcmd is automatically called by the boot/bootd command (which can be executed
manually or is executed automatically on start- up)
default: run flashboot
bootdelay time in seconds to interrupt the boot process / before bootd is carried out
default: 3
ethaddr unique Ethernet MAC address
sample: 00:50:D2:FA:B0:01
flashboot command sequence necessary for booting the kernel; loading the
root filesystem from onboard flash memory
default: cp.b $(initrdaddr) $(inaddr) $(insize);setenv bootargs $(basicargs)
initrd=0x$(inaddr),0x$(insize) $(mtdparts);bootm $(kerneladdr)
kerneladdr address of the linux kernel image
default: 10060000
initrdaddr address of the linux root filesystem image
default: 10200000
ipaddr IP address used by U-Boot
sample: 192.168.4.240
inaddr destination address of the initial ramdisk with root filesystem
default: 21400000
insize size of the initial ramdisk with root filesystem
sample: 2113C3
mtdparts the MTD partitions for the flash unit are defined here
default: mtdparts=physmap_flash.0:384k(boot),1664k(linux),3072k(initrd),
10240k(cfg),-(custom)
stdin standard input interface
default: serial
stdout standard output interface
Page 40 of 65 Version 1.26 (2008-04-30)