Re: [PATCH 00/10] Enhance /dev/mem to allow read/write ofarbitrary physical addresses

From: Matthew Wilcox
Date: Sun Jun 19 2011 - 20:43:07 EST

On Mon, Jun 20, 2011 at 09:02:17AM +1000, Ryan Mallon wrote:
> There are drivers where this makes sense. For example an FPGA device
> with a proprietary register layout on the memory bus can be done this
> way. The FPGA can simply be mapped in user-space via /dev/mem and
> handled there. If the device requires no access other than memory bus
> reads and writes then writing a custom char device driver just to get an
> mmap function seems a bit overkill.

Calling a 30 line device driver "overkill" might in itself be overkill?

Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
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