the code of bootstrap and uboot is put on the
http://git.openinkpot.org/, you will need git tools to download ,just use git-clone . if you want get the .bin , i can sent
you (tell me email).
bootstrap-git
http://git.openinkpot.org/?p=wenjie/....git;a=summary
uboot-git
http://git.openinkpot.org/?p=wenjie/....git;a=summary
but if you want to download the uboot into the 505 flash, you should solder some pins that make sure you can enter the bootstrap mode or you should write some auto stript (like what igorsk wrote)to flash the uboot into the 505 (have some risk )