Beagleboard beginner

I am trying to build the linux kernel for Beagle board(REV B7). The
beagle board
is connected to LCD through HDMI port.

Kernel source : 2.6.32
Toolchain :
http://www.angstrom-distribution.org/toolchains/angstrom-2010.4-test-20100422-i686-linux-armv7a-linux-gnueabi-toolchain-qte-4.6.2.tar.bz2
configuration: omap3_beagle_defconfig

While booting initially(u-boot), "Beagle board" logo comes up and when
the kernel starts, the display goes down.

I have downloaded the MLO, uboot & RootFS from
http://www.angstrom-distribution.org/demo/beagleboard/. With the
uImage
downloaded from this site, LCD display works fine.
Also tried building custom RootFS for beagleboard on
http://www.angstrom-distribution.org/narcissus/

Need to know what kernel configuration needs to be done to get the
LCD(connected over HDMI port) to work.