What information is displayed by the command cat /proc/dma?
A.
which DMA mode is in use
B.
general information about DMA on the machine
C.
whether DMA is enabled
D.
which DMA channels are in use
Explanation:
/proc/dma This file contains a list of the registered ISA direct memory access (DMA) channels in use. A sample /proc/dma files looks like the following:
4: cascade It shows whether DMA is enabled or not.
This could be D as well. When you do a cat /proc/dma it displays which channels are in use.
the correct answer is D indeed
$ cat /proc/dma ( what dma channels are used )
Refrence
http://www.brunolinux.com/02-The_Terminal/Hardware_info_commands.html
/proc/dma – Shows which DMA channels are being used at the moment.
http://www.thegeekstuff.com/2010/11/linux-proc-file-system