Doubt regarding DMA transfer size setting

NTDEV
1

Hi,
I have a doubt regarding WdfDmaEnablerCreate. My hardware dma transfer
size is 2MB. But I have given 4MB as MaximumLength in the
WDF_DMA_ENABLER_CONFIG structure. But it is working with no problem.
How?

Sreejesh

2

Sreejesh S. Warrier wrote:

I have a doubt regarding WdfDmaEnablerCreate. My hardware dma transfer
size is 2MB. But I have given 4MB as MaximumLength in the
WDF_DMA_ENABLER_CONFIG structure. But it is working with no problem. How?

If you never have a DMA request larger than 2MB, you’ll never encounter
this limit. The limit only comes in to play when you have requests
larger than the limit.

–
Tim Roberts, xxxxx@probo.com
Providenza & Boekelheide, Inc.