Texas Instruments DVEVM, Getting Started Manual, Page: 40 / 70

Installing the Software
4-10
4) Set the following environment variables in the console window:
EVM # setenv nfshost <IP ADDRESS OF YOUR NFS HOST>
EVM # setenv rootpath <DIRECTORY_TO_MOUNT>
EVM # setenv bootargs console=ttyS0,115200n8 noinitrd rw
ip=dhcp root=/dev/nfs
nfsroot=$(nfshost):$(rootpath),nolock mem=120M
5) Save the environment so that you don't have to retype these
commands every time you cycle power on the EVM board:
EVM # saveenv
6) Boot the board using NFS:
EVM # boot
See Section A.5, Alternate Boot Methods for information about booting
with TFTP or NFS and using flash or the board’s hard drive.
4.3.6 Configuring the Boot Setup for PAL Video Users
You can configure the DVEVM to select either the NTSC or PAL video
standard during the default boot sequence. To select PAL, set switch 10
on the S3 (USER) user bank of switches to On. For NTSC, set this switch
to Off. The switch causes the U-Boot environment variable "videostd" to
be set to "pal" or "ntsc".
Using the "videostd" variable in the "bootargs" environment variable
passed to the Linux kernel causes the corresponding video standard to
be used by the display (VPBE) driver. The default "bootcmd" environment
variable accomplishes this task as follows:
bootargs="mem=120M console=ttyS0,115200n8 root=/dev/hda1 rw
noinitrd ip=dhcp"
bootcmd="setenv setboot setenv bootargs \$(bootargs)
video=dm64xxfb:output=\ $(videostd) ;run setboot;bootm
0x2050000"
When the "boot" command is run in U-Boot, the value of "videostd" is
substituted based on the setting of the switch.
The bootargs examples in the rest of this manual assume the default
NTSC video output is being used. If you are using PAL video, you will
need to modify the examples accordingly.
See Section A.2, Changing the Video Input/Output Methods for
information about switching to S-Video and Component video.