I do not see the BB_STRICT_CHECKSUM variable in the Yocto documentation.
As far as I can tell, you don't need to specify checksums SRC_URI[...]for the git repository. In your recipe for beatbox, does it have it /PATH/TO/ti-linux-kernel.git git://at the beginning? Bitbake uses this to determine the type of SCM tool used. If you want to access git reposition via http, you must specify
SRC_URI = "git://server.com/PATH/TO/ti-linux-kernel.git;protocol=http"
Worried, this is only outlined in the documentation for SRC_URI .
SRC_URI [md5sum] SRC_URI [sha256sum] , tarballs , . tarball (, http://server.com/path/to/some-project.tar.gz), ,
... , . . , .
, .