Dynamic Memory Split!

[BartOtten]

CMA - Dynamic Memory Split

The firmware and kernel as of 19. November 2012 supports CMA, which means the memory split between ARM and GPU is managed dynamically at runtime. You can find an example config.txt here.

cma_lwm When GPU has less than cma_lwm (low water mark) memory available it will request some from ARM.
cma_hwm When GPU has more than cma_hwm (high water mark) memory available it will release some to ARM.

The following options need to be in cmdline.txt for CMA to work:

coherent_pool=6M smsc95xx.turbo_mode=N