Texas Instruments TMS320DM6446 DVEVM v2.0 User Manual

Page 46

Building a New Linux Kernel

4-14

host $ arm_v5t_le-gcc hello.c -o hello

Perform the following steps on the target board. You may use either the
target's console window (Section 2.2) or a telnet session.

target $ cd /opt/hello

2) Run ./hello. The output should be:

Buongiorno DaVinci!

4.5

Building a New Linux Kernel

If you modify the target’s Linux kernel sources, you will need to rebuild it
and then boot it up by either replacing the kernel that comes installed on
the EVM board’s flash or by having the U-Boot utility use TFTP to boot
the kernel over a network connection.

Make sure you have completed Section 4.4, Setting Up the
Build/Development Environment and Section 4.4.1, Writing a Simple
Program and Running it on the EVM before attempting to build a new
kernel.

To rebuild the Linux Kernel, follow these steps:

1) Log in to your user account (not as root).

2) Set the

PLATFORM

variable in the Rules.make file as described in

Section 4.6.

3) Use commands like the following to make a local working copy of the

MontaVista Linux Support Package (LSP) in your home directory.
This copy contains the embedded Linux 2.6.18 kernel plus the
DaVinci drivers. If you installed in a location other than
/opt/mv_pro_5.0, use your location in the cp command.

host $ cd /home/<useracct>

host $ mkdir -p workdir/lsp

host $ cd workdir/lsp

host $ cp -R /opt/mv_pro_5.0/montavista/pro/devkit/lsp/ti-davinci .

4) Use the following commands to configure the kernel using the

DaVinci defaults. Note that CROSS_COMPILE specifies a prefix for
the executables that is used during compilation:

host $ cd ti-davinci/linux-2.6.18_pro500

host $ make ARCH=arm CROSS_COMPILE=arm_v5t_le- davinci_dm644x_defconfig