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AM335X GPMC READ FPGA TOO SLOW!

Other Parts Discussed in Thread: AM3359

Hi,all

In my design,AM3359'GPMC is connected with FPGA. I found the read cycle is too slow,even than MCS51!!

MMU and CHCHE are enable,CPU runs at 600MHz without OS.

Can anyone teach me how to solve the problem?

I try to use QDMA,but I got into another trouble: when  MMUConfigAndEnable , the FPGA was read out as zero for ever(the data send from FPGA were OK in signaltap).when  MMU was absent ,the readout  were all OK!

but MMU is Necessary Absolutely,otherwise the AM335X will run  too slowly!