Re: sys/dev/isa/fd.c FDUNIT/FDTYPE

To: tech-kern%netbsd.org@localhost
Subject: Re: sys/dev/isa/fd.c FDUNIT/FDTYPE
From: Martin Husemann <martin%duskware.de@localhost>
Date: Tue, 3 May 2011 23:31:55 +0200

On Tue, May 03, 2011 at 08:06:56PM +0200, Edgar Fuß wrote:
> sys/dev/isa/fd.c defines FDUNIT and FDTYPE as DIV/MOD 8.
> etc/MAKEDEV uses makedisk_p16 for fd*.
> 
> Who's right?
> As I'm just adding a ninth (ten-sector) fd_type, I prefer the 16 version.

FDUNIT and FDTYPE both derive from minor(dev).
MAKEDEV creates 16 minors, so you get unit 0 and 1, and 8 types each.

What is FDUNIT good for?

Martin

Follow-Ups:
- Re: sys/dev/isa/fd.c FDUNIT/FDTYPE
  - From: Edgar Fuß

References:
- sys/dev/isa/fd.c FDUNIT/FDTYPE
  - From: Edgar Fuß

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