BF518F16 cache init

I developed a board based on BF518F16 with 64Mbyte SDRAM and 8Gbyte NAND.

All work fine, but would like to know where can I find a document or an example code where explained the cache initialization and usage.

I use the GNU toolchain with a homebuilt environment:

Blackfin GNU Toolchain - D.T.A.

In a simple SDRAM speed test I achieve a performance of 170 Mbyte/s in writing and 30 Mbyte/s in reading.

Can be these value increased with a correct cache initialization?

Regards

Manuele