Measure SDMA Memory To Memory Copy Performance on i.MX6Q

[#1]

Overview

The document describes the procedure to measure the memory to memory copy performance by using SDMA on i.MX6Q.

Materials

• i.MX6Q Sabre SD board
• L3.0.35_4.1.0_130816 BSP

Procedure

• Install BSP and build kernel
• Extract imx unit test source:
  • ./ltib -p imx-test -m prep
• Apply attached patch to sdma memcopy code
  • cd ltib/rpm/BUILD/imx-test-3.0.35-4.1.0
  • patch -p1 -i LTIB_4.1.0_sdma_m2m_test.patch
    
• Build imx unit test
  • ./ltib -p imx-test -f
• Copy kernel and rootfs to SD Card.
• Boot kernel and login
• Insert the kernel module for SDMA memory copy test:
  
  • insmod /lib/modules/XXX/test/mxc_sdma_memcopy_test.ko
• Start SDMA memory copy test
  • /unit_tests/mxc_sdma_test.out

Result

root@freescale ~$ insmod /lib/modules/3.0.35-2666-gbdde708-g1c42f8b/test/mxc_sdma_memcopy_test.ko

SDMA test major number = 248

SDMA test Driver Module loaded

root@freescale ~$ /unit_tests/mxc_sdma_test.out

in dma_m2m_callback

65532byte / 0.003382sec

buffer 1 copy passed!

root@freescale ~$ /unit_tests/mxc_sdma_test.out

in dma_m2m_callback

65532byte / 0.003367sec

buffer 1 copy passed!

root@freescale ~$ /unit_tests/mxc_sdma_test.out

in dma_m2m_callback

65532byte / 0.003364sec

buffer 1 copy passed!

In summary, > 19Mbyte/sec

[#2]

I am getting Failed open error on executing mxc_sdm_test.out. Do es anybody now what the problem could be?