The AM1808 Product Folder should be a good starting point resource for information that you need to design with the AM1808.
The AM1808 is a pin-for-pin compatible device to the OMAP-L138. In the Design Kits & Evaluation Modules section of the AM1808 Product Folder you will find AM1808 specific kits and those that can be used to model the AM1808.
There is also an AM18xx portal on the http://processors.wiki.ti.com site that contains useful information for you.