On this page: http://www.ti.com/product/tms320dm8148
There is a link to this document: http://www.ti.com/litv/pdf/sprabm2
Which is basically just a link to this URL: http://ap-fpdsp-swapps.dal.design.ti.com/index.php/TI814x-DDR3-Init-U-Boot
This URL is not accessible, does not even resolve. I think it may be an internal TI server?