Hi Bill
After discussion, we give up eMMC booting on AM437x GP EVM. Your sugestion is good but I think it's too complicated to me at now, and the deadline will coming soon. I will make a research in future.
Now I am trying to build a smaller image using the snapshot of the source packages in Processor SDK release (ti-processor-sdk-linux-am437x-evm-05.00.00.15 ) but I can not download git2_git.linaro.org.toolchain.gcc.git.tar.gz by “am437x-evm-linux-sdk-arago-src-05.00.00.15/get_build_sources.sh am437x-evm-linux-sdk-arago-src-05.00.00.15/source_pkg_list.txt” command or web browser from software-dl.ti.com/.../
However, I have tried to build arago-base-tisdk-image without git2_git.linaro.org.toolchain.gcc.git.tar.gz to see what happens. I also attack a build log file until 37% for you to consider.(Please visit the site to view this file)
Hope receiving feedback from you.
Thank you.