i.MX6SX Cortex-M4 SDMA M2M Transfer Problem

[joursland]

I have ported over the i.MX6UL FreeRTOS SDMA and sdma_memory_to_memory example application to the i.MX6SX platform for the Cortex-M4 core.  When I run the application I get some strange behavior dependent upon the "count" parameter of the SDMA BD.

Platform: i.MX6SX SABRE-SDB

Software: FreeRTOS_BSP_1.0.1_iMX6SX

Toolchain: GNU Tools for Arm Embedded Processors 7-2018-q3-update

Expected Behavior:

    * All bytes in the source buffer are correctly copied to the destination buffer via the SDMA

Actual Behavior:

    * For counts 1-7, the source is correctly copied to the destination buffer.

    * For count of 8 bytes, the first 4 bytes of the source are copied to the destination, then the next 4 bytes are copied to offset 12 (incorrectly skipping 8 bytes).

    * For a count of 12 bytes, the behavior of 8 bytes is observed, but then the source bytes at offsets 8-11 are correctly located at destination offsets 8-11.

    * For a count of 16 bytes, the behavior of 12 bytes is observed, but bytes at source offsets 8-15 are reproduced at destination offsets 16-23.  This means bytes at offsets 8-11 are duplicated.

Steps to Reproduce:

    1. Download the attached memory_to_memory.zip example

    2. Create the directory FreeRTOS_BSP_1.0.1_iMX6SX/examples/imx6sx_sdb_m4/driver_examples/sdma

    3. Extract the zip file to the location FreeRTOS_BSP_1.0.1_iMX6SX/examples/imx6sx_sdb_m4/driver_examples/sdma.  A directory containing source should be created at FreeRTOS_BSP_1.0.1_iMX6SX/examples/imx6sx_sdb_m4/driver_examples/sdma/memory_to_memory.

    4. Build with the script build_debug.sh in the FreeRTOS_BSP_1.0.1_iMX6SX/examples/imx6sx_sdb_m4/driver_examples/sdma/memory_to_memory/armgcc.

    5. Load and run the resulting binary within u-boot.

Notes:

    * All memory is within the TCM so as to eliminate external memory configuration concerns.

Is there some misconfiguration within my program that would cause the SDMA M2M (IMX6SXRM Appendix A ap_2_ap) script to perform this behavior?

Thanks,

Jake

2018-10-30: The requested file has been uploaded.  

Regards,

Jake

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[vanessa_maegima]

Hi Jacob,

I think the problem is that the SDMA scripts are made from the Cortex-A perspective, the iMX6UL has only a Cortex-A9 core so that's why it has a SDMA M2M example. You would need to modify the SDMA scripts to make them work with the M4 core.

Unfortunately we cannot provide the SDMA scripts source code and/or modifications, this is out of the standard support that we provide. You can contact Professional Services to check if this is something that can be done.

Reference: https://www.nxp.com/support/support/nxp-professional-services:PROFESSIONAL-SERVICE
Contact: Prosupport@nxp.com

Thanks!

Vanessa

[vanessa_maegima]

Hi joursland@jetheaddev.com‌,

Could you please send me the full project folder with your modifications (FreeRTOS_BSP_1.0.1_iMX6SX)?

I see some missing files trying to compile just by adding the "memory_to_memory" folder.

/home/vanessa/Documents/community/487273_sx_sdma_m2m/FreeRTOS_BSP_1.0.1_iMX6SX/platform/drivers/src/ccm_analog_imx6sx.c:31:31: fatal error: ccm_analog_imx6sx.h: No such file or directory
/home/vanessa/Documents/community/487273_sx_sdma_m2m/FreeRTOS_BSP_1.0.1_iMX6SX/platform/drivers/src/ccm_imx6sx.c:31:24: fatal error: ccm_imx6sx.h: No such file or directory
/home/vanessa/Documents/community/487273_sx_sdma_m2m/FreeRTOS_BSP_1.0.1_iMX6SX/platform/utilities/src/debug_console_imx.c:35:24: fatal error: device_imx.h: No such file or directory
/home/vanessa/Documents/community/487273_sx_sdma_m2m/FreeRTOS_BSP_1.0.1_iMX6SX/platform/drivers/src/lmem.c:31:18: fatal error: lmem.h: No such file or directory
/home/vanessa/Documents/community/487273_sx_sdma_m2m/FreeRTOS_BSP_1.0.1_iMX6SX/platform/drivers/src/ccm_analog_imx6sx.c:31:31: fatal error: ccm_analog_imx6sx.h: No such file or directory
/home/vanessa/Documents/community/487273_sx_sdma_m2m/FreeRTOS_BSP_1.0.1_iMX6SX/platform/drivers/src/ccm_imx6sx.c:31:24: fatal error: ccm_imx6sx.h: No such file or directory
/home/vanessa/Documents/community/487273_sx_sdma_m2m/FreeRTOS_BSP_1.0.1_iMX6SX/platform/utilities/src/debug_console_imx.c:35:24: fatal error: device_imx.h: No such file or directory

I could copy the files from the 6UL SDK but I just want to make sure I have the same setup as yours.

Thanks in advance!

Best Regards,
Vanessa

[joursland]

Hi Vanessa,

I have uploaded the complete project folder as FreeRTOS_BSP_1.0.1_iMX6SX_SDMA.tgz.

Regards,

Jake

[vanessa_maegima]

Hi Jacob,

I received your package and I can see the issue on my board.

I started investigating this and I'll probably have an answer by next week (will be out of office tomorrow).

Thanks!

Vanessa

[karina_valencia]

vanessamaegima‌, can you help with this thread?

[vanessa_maegima]

Sure Karina, I will investigate this.