IMX8M Mini SDMA1 EXT EVENT0

[vishwas_m]

Hi,

The GPIO1_IO03 pad has an alternate function SDMA1_EXT_EVENT0(ALT5) according to the NXP IMX8M reference manual.

When I configure the IOMUX to enable SDMA_EXT_EVENT0 on GPIO1_IO03 pad. The SDMA goes to an unpredictable state after SDMA is Initialised using SDMA_Init() API on the Mcuexpresso SDK.
I see a lot of events pending on SDMA1 i.e SDMAARM1->EVTPEND reg value is 0x24da1f7f.
If the IOMUX is configured to set the GPIO1_IO03 pad to GPIO1_IO03, The SDMAARM1->EVTPEND reg value is 0x0.

Is there a way to reset the SDMA EVTPEND register?
I am using the Mcuxpresso SDK ECSPI SDMA example to initialize the SDMA and read the registers. 

[igorpadykov]

Hi Vishwas 

I am afraid SDMA_EXT_EVENT0 usage is not supported in nxp linux bsps,

as it requires special sdma scripts. As additional reading may be useful to look at

Freescale i.MX SDMA tutorial (part IV) 

Best regards
igor
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