Hi,
I would like to know about the device drivre development. I know the basic
concepts behind a device driver. But haven't written a driver my self. But
now time has come for me to do that.
I need to develop a device driver for a ethernet switch/hub. So I would
like to have some clarifications:
1. How much effort it takes for a real device driver to be written?
Please provide a realistic estimate. I guess somebody might have written
some commercial device drivres.
2. What all information do I need to design a device driver? I have the
data sheets of the product available from the net. Anything else I need?
3. How do I decide whether a driver has to be block device or character
device?
4. I went through the two documents posted on the list about newbus. Is it
mandatory that one has to use newbus architecture from FreeBSD 4.0
onwards? Frankly speaking I didnt understand much of the documents.
5. I would like to know where I can get the small driver written by Warner
Losh?
6. Any other info on device drivers for freeBSD other than these two
documents posted on the list? I checked in the handbook but there seems
nothing on device drivres.
thanks in advance
--gb
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