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Date:      Sat, 15 Dec 2001 11:09:05 -0800 (PST)
From:      Joerg Wunsch <joerg@FreeBSD.org>
To:        cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   cvs commit: src/usr.sbin/fdcontrol Makefile fdcontrol.c src/usr.sbin/fdformat fdformat.c src/usr.sbin/fdread fdutil.c fdutil.h
Message-ID:  <200112151909.fBFJ95x26334@freefall.freebsd.org>

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joerg       2001/12/15 11:09:05 PST

  Modified files:
    usr.sbin/fdcontrol   Makefile fdcontrol.c 
    usr.sbin/fdformat    fdformat.c 
    usr.sbin/fdread      fdutil.c fdutil.h 
  Log:
  Long promised major enhancement set for the floppy disk driver:
  
  . The main device node now supports automatic density selection for
    commonly used media densities.  So you can stuff your 1.44 MB and
    720 KB media into your drive and just access /dev/fd0, no questions
    asked.  It's all that easy, isn't it? :)
  
  . Device density handling has been completely overhauled.  The old way
    of hardwired kernel density knowledge is no longer there.  Instead,
    the kernel now implements 16 subdevices per drive.  The first
    subdevice uses automatic density selection, while the remaining 15
    devices are freely programmable.  They can be assigned an arbitrary
    name of the form /dev/fd[:digit]+.[:digit:]{1,4}, where the second
    number is meant to either implement device names that are mnemonic
    for their raw capacity (as it used to be), or they can alternatively
    be created as "anonymous" devices like fd0.1 through fd0.15,
    depending on the taste of the administrator.  After creating a
    subdevice, it is initialized to the maximal native density of the
    respective drive type, so it needs to be customized for other
    densities by using fdcontrol(8).  Pseudo-partition devices (fd0a
    through fd0h) are still supported as symlinks.
  
  . The old hack to use flags 0x1 to always assume drive 0 were there is
    no longer supported; this is now supposed to be done by wiring the
    devices down from the loader via device flags.  On IA32
    architectures, the first two drives are looked up in the CMOS
    configuration records though.  On PCMCIA (i. e., the Y-E Data
    controller of the Toshiba Libretto), a single drive is always
    assumed.
  
  . Other specialities like disabling the FIFO and not probing the drive
    at boot-time are selected by per-controller or per-drive flags, too.
  
  . Unit attentions (media has been changed) are supposed to be detected
    now; density autoselection only occurs after a unit attention.  (Can
    be turned off by a per-drive flag, this will cause each Fdopen() to
    perform the autoselection.)
  
  . FM floppies can be handled now (on controllers that actually support
    it -- not all do these days).
  
  . Fdopen() can be told to avoid density selection by setting
    O_NONBLOCK; this leaves the descriptor in a half-opened state where
    only a few ioctls are accepted.  This is necessary to run fdformat
    on a device that uses automatic density selection (since you cannot
    autoselect on an unformatted medium, obviously).
  
  . Just differentiate between a plain old NE765 and the enhanced chips,
    but don't try more; the existing code was wrong and only misdetected
    the chips anyway.
  
  BUGS and TODOs:
  
  . All documentation update still needs to be done.
  
  . Formatting not-so-standard format yields unpredictable results; i
    have yet to figure out why this happens.  "Standard" formats like
    720 and 1440 KB do work, however.
  
  . rc scripts are needed to setup device nodes with nonstandard
    densities (like the old /dev/fdN.MMM we used to have).
  
  . Obtaining device flags from the kernel environment doesn't work yet,
    thus currently only drives that are present in (IA32) CMOS are
    really detected.  Someone who knows the odds and ends about device
    flags is needed here, i can't figure out what i'm doing wrong.
  
  . 2.88 MB still needs to be done.
  
  Revision  Changes    Path
  1.6       +5 -1      src/usr.sbin/fdcontrol/Makefile
  1.9       +124 -90   src/usr.sbin/fdcontrol/fdcontrol.c
  1.19      +144 -157  src/usr.sbin/fdformat/fdformat.c
  1.2       +389 -3    src/usr.sbin/fdread/fdutil.c
  1.2       +8 -0      src/usr.sbin/fdread/fdutil.h

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