TDA4VM: Udma_chOpen fails for DRU Direct Example Code

Marina Lenza

Part Number: TDA4VM

Hello TI,

I am trying to use the udma_direct_dru_test.c code to read and write to the PCIe memory, but it fails on the channel opening at the channel allocation function (it returns CSL_EALLOC).

In the example, there are only a few channel parameters that are being set, are there any others that should be set before calling chOpen function?

        /* Init channel parameters */
        chType = UDMA_CH_TYPE_UTC;
        UdmaChPrms_init(&chPrms, chType);
        chPrms.utcId                = UDMA_UTC_ID_MSMC_DRU0;
        /* Ring not used in direct TR submission via DRU */
        chPrms.fqRingPrms.ringMem   = NULL;
        chPrms.cqRingPrms.ringMem   = NULL;
        chPrms.tdCqRingPrms.ringMem = NULL;
        chPrms.fqRingPrms.elemCnt   = 0U;
        chPrms.cqRingPrms.elemCnt   = 0U;
        chPrms.tdCqRingPrms.elemCnt = 0U;

        /* Open channel for DRU */
        retVal = Udma_chOpen(drvHandle, chHandle, chType, &chPrms);

Thank you,

Marina

over 2 years ago

0 Brijesh Jadav over 2 years ago

TI__Guru**** 490565 points

Hi Marina,

On which core are you trying to run this? Also does this core have DRU channels allocated? If not, please use K3 resource manager tool to allocate DRU channels for this core. You could follow below FAQ for allocation different UDMA resources using K3 resource manager.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1097038/faq-tda4vm-workflow-and-resource-allocation-build-flow-for-sysconfig-tool

Regards,

Brijesh

0 Marina Lenza over 2 years ago in reply to Brijesh Jadav

Prodigy 100 points

Hi Brijesh,

I am trying on MCU R5F, and on rm-cfg.c there is no DRU channel allocated for this core.

I will follow the FAQ instructions.

Thank you,

Marina

0 Brijesh Jadav over 2 years ago in reply to Marina Lenza

TI__Guru**** 490565 points

Thanks Marina.

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TDA4VM: Udma_chOpen fails for DRU Direct Example Code