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LinuxQuestions.org (/questions/)
-   Linux - Kernel (https://www.linuxquestions.org/questions/linux-kernel-70/)
-   -   mmap of several GB of reserved memory using (https://www.linuxquestions.org/questions/linux-kernel-70/mmap-of-several-gb-of-reserved-memory-using-805818/)

mod_dev_123 08-14-2015 05:05 AM
A follow-up question: What's the need for performing the ioremap at all?
DMA will use the physical address, and the user level process will use the mmaped address.

Thanks.

mod_dev_123 08-15-2015 09:15 PM
Sorry, a more basic question first - once such a memory range is reserved, is it also possible to perform DMA into this memory area? How does the driver obtain the DMA address to be used for this purpose?

Thanks.

sundialsvcs 08-17-2015 09:50 AM
It partly depends on the motherboard . . . some DMA has a limited range.


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