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IMX7D EIM bus transmission speed

Question asked by 其东 刘 on May 17, 2020
Latest reply on May 18, 2020 by igorpadykov

Hello everyone
my development board is IMX7DSABRE. Linux kernel version is 4.9.88
I communicate with FPGA through EIM bus. During the communication, I found that the transmission speed of EIM is only 7MByte / S. This transmission speed cannot meet our needs. What is the theoretical transmission speed of EIM bus on imx7d? How should we increase the transmission speed of EIM?
The way we test the transmission speed of EIM is through the devmem2 tool. We modified the source file devmem2.c to keep it reading data on the EIM bus. Then through calculation, the transmission speed is only 7MByte / S