On 20/06/11 10:42, Matthew Wilcox wrote:
I mean overkill in the sense of having to write the driver at all. Why write a 30 line driver just to re-implement some functionality of /dev/mem?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?
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