iMX6 SDMA falling edge event

[raajeshk88]

Hi,

     We are trying to access iMX6 S/DL SDMA from a EIM FPGA . The SDMA scheduler SDMA_event_0 always detects a rising edge. Is there a way to change this to detect falling edge using any register settings or the HW is always designed in a way only to detect rising edge. Thanks

[raajeshk88]

Hi Igor,

      Can we use SDMA_EVENT_0 to trigger events. We are abe to use only EVENT_1. Kindly help to clarify.Thanks

[igorpadykov]

Hi Raajesh

seems not as Table 3-2. SDMA event mapping describes only EVENT_1

Best regards
igor

[raajeshk88]

Hi Igor,

           Thanks, could you please help on the procedure to use EVENT0 as well if any. 

Regards,

Raajesh K

[igorpadykov]

Hi Raajesh

this is not "officially supported", means no support is described in

Linux Release Notes included in Linux documentation:

i.MX Software and Development Tools | NXP 

Standard support path in such cases: Commercial Support and Engineering Services | NXP 

Best regards
igor

[raajeshk88]

Hi Igor,

 Thanks for the support. Will proceed accordingly.

Regards,

Raajesh K

[igorpadykov · Accepted solution]

Hi Raajesh

I am afraid SDMA_event_0 detection polarity can not be changed as

it is fixed in hardware, sorry.

Best regards
igor
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[raajeshk88]

Hi Igor,

   We are facing one more issue with SDMA event. Even though we configure to use SDMA_EVENT_0 as interupt the SDMA is triggered only when EVENT_1 is triggered. I saw there is something related to SOC revision in one of the NXP forum discussion https://community.nxp.com/thread/324491 . Is this is the case? If so can you specify the revisions for Quad and Solo/Dual. Thanks

Regards,

Raajesh K

[igorpadykov]

Hi Raajesh

as answered on that link, there are no SDMA_event_0 scripts, so you

will have to write new script for it. I am afraid that info about revisions

is not available regarding SDMA_EVENT.

Best regards
igor

[raajeshk88]

Hi Igor,

           So it means we can use only EVENT_1 to trigger SDMA requests. Is my understanding correct. Thanks

Regards,

Raajesh K

[raajeshk88]

Hi Igor,

   Is my understanding correct? Thanks

[raajeshk88]

Hi Igor,

Thanks for the confirmation. 

Regards,

Raajesh K