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Altera_Forum's avatar
Altera_Forum
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20 years ago

Setting up a DMA Transaction in a driver

Hello everyone, i currently working on driver, where i need to do some dma-transaction. I can do DMA and PIO directly on the Nios 2 System, without Linux ( withot an running system Linux Ker...
Altera_Forum's avatar
Altera_Forum
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20 years ago

Hi Helmchen,

> request_dma(...) fails... for example

Check the name of your dma controller in SOPCBuilder ... I believe it needs to be

"dma_0" ... and "dma_1" if you have a second controller. Otherwise, the dma

channel table won't have anything in it (since the address and irq macros won't

be defined). See arch/nios2nommu/kernel/dma.c

Regards,

--Scott