The kernel source for the SoM-9G20M is located on the EMAC Public SVN server:
https://svn.emacinc.com/public/linux-2.6.28-at91/

The most recent version is in the trunk, releases are located in the tags directory.

It may be checked out using an SVN client (the preferred method) or you may download
a tarball of the tree through https://svn.emacinc.com via the WebSVN interface.

The kernel-build-cross.sh script will assist with building the kernel. The default
configuration file is located in arch/arm/configs/som9g20-defconfig in the kernel
source.

Contact EMAC Technical Support for assistance.
www.emacinc.com/support