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Altera_Forum
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9 years ago

DMA read timeout while using PL330?

Hi we are using the HPS-DMAC (PL330) on a De0-Nano-SoC board to write and read data from the FPGA through a kernel module using the dmaengine API. Writing works fine (albeit pretty slow), but e...
Altera_Forum's avatar
Altera_Forum
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9 years ago

Did you ever get anywhere with this problem? I am having a similar problem. Using the fpga-dma example I want to read data from a fifo on the lwhpsslave.

Its a custom board, but a cyclone v soc just like the de0-nano-soc. I am running 4.2 kernel. Seems to load the driver ok. But I get no errors and no data transfer.

Like you its just pending. Programmed Io works fine.

[ 0.300924] dma-pl330 ffe01000.pdma: Loaded driver for PL330 DMAC-341330

[ 0.300943] dma-pl330 ffe01000.pdma: DBUFF-512x8bytes Num_Chans-8 Num_Peri-32 Num_Events-8

Thanks,

Jeff