"The config.txt is loaded after the split is done so you cannot specify the splitting amounts in the config.txt. However, different .elf files having different

"The config.txt is loaded after the split is done so you cannot specify the splitting amounts in the config.txt. However, different .elf files having different splits exist in the SD Card." This hasn't been true for some time. In fact runtime dynamic RAM management has been available since Nov '12. See http://elinux.org/RPiconfig#CMA_-_Dynamic_Memory_Split http://elinux.org/RPiconfig#CMA_-_Dynamic_Memory_Split for more details.