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From: burgess@brooks.af.mil (Dave Burgess)
Newsgroups: comp.os.386bsd.announce,comp.answers,news.answers
Subject: comp.os.386bsd.announce Frequently Asked Questions (Part 5 of 9)
Followup-To: comp.os.386bsd.announce
Date: 26 Aug 1993 15:20:12 -0000
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Expires: 09/13/93
Message-ID: <386bsd-faq-5-746378397@brooks.af.mil>
References: <386bsd-faq-1-746378397@brooks.af.mil>
Reply-To: 386bsd-faq@brooks.af.mil (386bsd FAQ Maintainer)
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Posted-By: auto-faq 2.4
Archive-name: 386bsd-faq/part5

Section 5.	(Kernel Replacements)

5.0	Introduction

	This section is supposed to document the unusual or optional
	kernel add-ons that are available from various places.  As 
	they are included in the mainstream of the various Berkeley
	Net Release systems, they will slowly come out of here.

	If you know of any replacement parts for the kernel, please 
	send Dave Burgess (burgess@hrd769.brooks.af.mil) a message 
	detailing the package (possibly include a README), where it 
	can be found, and what version of the OS (ie. NetBSD, 
	386bsd 0.1 + pk 0.2) it was designed to run under.

	When the exact directory is not listed for a package, the
	places to look on agate.berkeley.edu are in unofficial/drivers
	and unofficial/from-ref/sys.extras.

	Many a goodie can be found in these directories.


5.1	Available Kernel Replacements


5.1.1	keycap/codrv

	These server as replacements for the generic pccons driver
	that comes (by default) with 386bsd 0.1.

	Holger Veit (author of these) writes:

	"The same type of driver, but keycap has the version number 0.1.1
	and codrv has the version number 0.1.2.  The latter is much 
	improved and downward compatible.  Codrv was developed to provide
	a universal way of mapping national keyboard layouts during
	runtime (ie, not by patching the kernel tables) and providing
	better X11 support.  Codrv uses a superset of the pc3 terminal 
	emulation, and a termcap-like database for keymaps (therefore
	"keycap").  X11 is supported by two dedicated console raw devices
	/dev/kbd and /dev/vga, which avoids all the existing problems
	pccons has with X11.  The latest version has virtual consoles.
	Codrv will become part of patchkit 0.2.4"

	This package is available on agate.berkeley.edu.

	

5.1.2	pcvt

	A superset of pccons, this driver supports virtual consoles, 
	and some form of database oriented keyboard mappings.  It was
	also designed to emulate a vt220 terminal as best as possible.

	Joerg Wunsch, the author of pcvt <joerg_wunsch@tcd-dresden.de>
	has sent us this update.

	I've arranged irz301.inf.tu-dresden.de [141.76.4.1] as the 
	`official' ftp server for the pcvt console driver, as long as 
	there are several different drivers.  The stuff is under 
	~ftp/pub/unix/386bsd/pcvt, along with some recent (still 
	unofficial) patches to be compatible with XFree86.  Everything 
	is scheduled with the author, Hellmuth Michaelis.

	I'm not the official maintainer of that ftp site, so I must ask 
	the folks there to help me.  This might delay recent changes; 
	before they're merged into the official server tree, they can 
	be found in ~ftp/pub/incoming/unix/386bsd.

	The Dresden University has only a thin wire to outside.  Any 
	mirroring site, especially in US, would be appreciated.  The 
	space requirements are less, only 2 or 3 Meg.  Maybe I'll upload 
	a `generic' kernel configured with pcvt there some day.

	all the best, J"org <joerg_wunsch@uriah.sax.de>

5.1.3	syscons

	Another superset of pccons that was designed to emulate SCO as
	well as possible.  Many of the ioctls from SysV have been 
	implemented.  XFree86 requires special patches to be run with
	kernels using this console driver. Available on agate.


5.1.4	Fast Symbolic Links

	The following is taken from the README for the fast sym-links
	patch:

	"This cruddy but complete hack answers one of the objections to
	 symlinks: that they are slow, and cost an entire frag.  Symlinks
	 of less than length 60 are stored in the inode itself.  Symlinks
	 longer than this are still in the inode.  To make the illusion
	 of normality complete, dump and fsck also need changing.  
	 Additionally, I made dumpfs verbose to excess."

	Available on agate.


5.1.5	npx fixes

	There are problems with the floating point error handling 
	routines, and there are fixes available for this problem provided
	by Bruce Evans (of Minix-386 fame)

	The code for these fixes is available on agate.berkeley.edu
	in unofficial/from-ref/sys.extras/bde-npx.

	Note the most of the code is applicable to floating point hardware
	as opposed to emulation.

	The newest version (and now official) fixes to this are in
	patchkit-0.2.4.


5.1.6	CGD's COM drivers

	Chris G. Demetriou (cgd@blah blah blah) has written some COM drivers
	for 386bsd.  These, among other things, support multi-port serial
	packages.

	The latest (and last) version is 0.2, and is available on agate
	in unofficial/from-ref/sys.extras/cgd-com-ports.  Please note that
	this is not going be developed any further by the author, and no 
	new versions will appear.  Users who do not absolutely need the
	features this provides are encouraged to use the newest drivers
	that come with the patch-kits.


5.1.7	Tom Ivar Helbekkmo's wd.c replacement

	Tom Ivar Helbekkmo (tih@barsoom.nhh.no) has rewritten much of the
	wd.c file that handles common hard disks, and added many new
	features to the code.

	The patches to use these can be obtained from barsoom.nhh.no
	in pub/386bsd.  Users should consult the README file for more
	information.

	Also, it should be noted that NetBSD uses these drivers as their
	stock drivers.


5.1.8	Interruptless LPT Driver Kit

	An Interruptless lpr driver kit is available from agate.berkeley.edu
	in unofficial/drivers/lpt.

	This driver was designed with faster performance and lower system
	load in mind.  See the INSTALL-NOTES that come with the package
	for more details and installation information.

5.2	Floppy Disk problems.

	One of the most common problems in 386BSD involves working with 
	new boot sector and/or reformatting a floppy.  Dave Silvia 
	provided this section on using floppy disks.

5.2.1	How do I get a bootable floppy?

	Several ways, ranging from brain-dead-but-works to simplest.  
	Classification into categories is left to the reader (is there 
	really a difference between 'brain-dead' and 'simple'?:')

	1) rawrite (or dd) dist.fs (or fixit.fs) to a disk,
	   mount it, cd to the mount point, and execute:

		rm -rf .

	   you now have a bootable floppy!;^}

	2) Take your existing dist.fs or fixit.fs boot disk and
	   diskcopy it on a DOS machine.  Mount and rm as in 1)
	   above.  Again, you have a bootable floppy!;^}

	3) Run disklabel on the floppy, e.g.:

		disklabel -w -r fd0a floppy5

	   where 'floppy5' is a 'name' for an entry in the disktab
	   file in /etc.  You'll get a couple of ioctl errors because
	   writing a label to a floppy isn't supported (yet?), but
	   the boot blocks have indeed been written.

	4) Write the boot blocks to the floppy:

		cat /usr/mdec/fdboot /usr/mdec/bootfd | dd of=/dev/rfd0a

	   or, more simply:

		cat /usr/mdec/fdboot /usr/mdec/bootfd > /dev/rfd0a

	Methods 3) and 4) require you to run newfs on the floppy, e.g.:

	newfs /dev/rfd0a floppy5

	If you have a floppy that was originally bootable, but the boot
	blocks were somehow damaged, you can use method 3) or 4) to
	restore boot-ability (do _NOT_ run newfs).  You _could_, through
	the convolutions of copying a floppy whose boot blocks are damaged
	to a temporary location and then re-copying to a bootable floppy,
	use method 1) or 2) (if you really want to!;^})

	5)  If the disk is already newfs'ed and is otherwise ready to use,
	disklabel will write the boot blocks on the disk.  Read the man page
	for disklabel.

5.3	Unit Record

	These devices are also often referred to as character devices.
	
5.3.1	Printers

	Configuring a parallel printer for 386bsd requires a working 
	printer driver to be installed in the kernel.  386bsd 0.1 and
	NetBSD 0.8 both lack this driver in their stock manifestations.

	It is possible to connect a serial printer to either.  This brief
	tutorial is provided by Daryl Berryhill 
	(djberry2@b25info.b25.ingr.com)

	The way I got mine printer to work.

	1) connect a 25 pin to 9 pin null modem cable to printer and 
	   computer.
	2) set printer to 9600 baud, 7 data bits, even parity.
	3) configure /dev/com1 (DOS COM2) port the same way as the printer
	4) add a line to /etc/printcap that says:
	       lp|local line printer:\
	          :lp=/dev/com2:wq:sd=/var/spool/lpd:lf=/var/log/lpd-errs:\
	          :br#9600
	5) type "lpr <add filename here>"
	6) type "lpd"
	   and it should start printing.

	An obvious point, but make sure that you do NOT start a getty on 
	on the com port.  Check the /etc/ttys file and make sure that 
	the com port you select is not active.

5.3.2	Terminals/Keyboards
5.3.3	Modems

	How to add a modem to 386BSD:

	The first part that confused me was assuming that /dev/com1 is 
	the same as DOS com1, they're not.  /dev/com0 is connected to 
	COM1 and (I think) /dev/com1 is connected to COM2.

	The switch settings for my modem were the same as what I had 
	under DOS, CTS CD RTS et al were set to follow the actual line 
	(i.e. my modem can force them high, which I turn off)

	Ok that's not too bad.

	Now you need to edit the /etc/remote file to include a reference 
	to the com port. I have only used NetBSD-0.8, so I'm not sure 
	what the default files are like that come with the other rev's 
	of 386BSD.

	I added the last line (with com0).
	--------------------------------------------------------
	#	@(#)remote	5.2 (Berkeley) 6/30/90
	#

	...stuff deleted...

	# UNIX system definitions
	unix1200|1200 Baud dial-out to another UNIX system:\
		:el=^U^C^R^O^D^S^Q:ie=%$:oe=^D:tc=dial1200:
	unix300|300 Baud dial-out to another UNIX system:\
		:el=^U^C^R^O^D^S^Q:ie=%$:oe=^D:tc=dial300:

	...stuff deleted...

	dial2400|2400 Baud Hayes attributes:\
	        :dv=/dev/tty19:br#2400:cu=/dev/tty19:at=hayes:du:
	dial1200|1200 Baud Hayes attributes:\
	        :dv=/dev/tty19:br#1200:cu=/dev/tty19:at=hayes:du:
	
	# Hardwired line
	com1c|com1:dv=/dev/com1:br#9600:
	com1b:dv=/dev/com1:br#2400:

	com0:com0:dv=/dev/com0:br#9600:at=hayes:
	------------------------------------------------

	Ok, now if you are running as root you can use type 'tip com0' 
	and you should then be talking to your modem.  I use kermit to 
	transfer files, and it wants to create a lock file in (not sure 
	about the exact path) /var/spool/uucp/lock or something along 
	those lines.  I made the directory world writeable so I could 
	run kermit with my own uid, rather than root.

	Also, you may need to add an entry in /etc/remote for com0.

	Thanks also to thombsr@liciren.li.co.uk for information on how 
	to do this.

5.4	Tape Drives

	This section should help out for those of you that have either
	never used tape drives before, or only have experience with them
	as non-Unix devices.

5.4.1	Does the tape need to be formatted?

	It depends,   but I think usually not.  And when it is necessary,
	I don't know how it would be done.  One thing is for certain, 
	though, first....  NEVER use the block devices..  erase them and 
	forget you ever saw them.  All operations on tape should be to 
	the character device (rst0).


5.4.2	If I execute the command 'st -f /dev/st0 status', I get:
		Archive/Tandberg? tape drive, residual=0, blocksize=512
		Density: high = 16 (0x10), medium = 15 (0xf), low = 5 (0x5)
		ds=0
		er=0

	so to write to tape at high-density (QIC-150), presumably I want 
	to use a device with minor number +4 (in st.c, density is computed as
	minor >> 2 & 0x03, where low density == 3 and high == 1):

	You have the idea.. density is controlled by bits 2 and 3

		00 = default
		01 = hi density
		10 = medium density
		11 = low density, 

	Unless the driver knows about you kind of drive the density values
	may need to be set by hand before they make any sense.


5.4.3	When is erst0 used?

	e stands for 'eject' and is bit 1 of the minor.. 
	e.g. eject on close.. many devices can't actually do this.

	There is actually a method to this whole thing:

		r = raw		(rst0)
		e = eject	(erst0)
		n = No rewind	(nrst0 or maybe nerst0)

5.4.4	How is density (bpi) computed?  I am using 3M DC 6250 cassettes 
	which have a 250MB capacity on the Viper 150.  But computing the 
	bits/inch based on 250MB/tape-length (1020 ft.), I get a density 
	of 171335 bpi, which is nowhere near the 10000 bpi associated 
	with QIC-150 in the st(1) man page.  Why the discrepancy?

	These cartridge tapes are right onto the tape in narrow tracks, 
	which begin at opposite ends of the tape.  Track 0 starts at the
	beginning of the tape, and Track 1 starts at the other end, etc.

	So, how many times does the tape go backwards and forwards?  If 
	there are 17 tracks, your density is 170000 bpi if it is 10000
	bpi per track.

5.4.5	How is an appropriate block size determined (and in what units 
	are they specified in the st(1) command)?

	QIC 150 and below should stick to 512 byte blocks a write of 
	1024 bytes from the program will be written as 2 512 byte blocks 
	with no speed penalty.  dd will think it's writing a 1024 byte 
	block but on tape it's 2 x 512.

	Stick to 512 on QIC 150 or less if you ever hope to swap data 
	with anyone else.


5.4.6	From the 4.3BSD mtio(4) man page, it sounds like data is typically
	(traditionally?) stored on tape in eof-terminated sequences of 
	1K records.  

5.4.6.1	Is st's notion of "file" the record sequence between two eof marks?  

5.4.6.2	What about a "record"?  

5.4.6.3	Is a "record" one "block", as determined by st's "blocksize" command?   
	If not, what is the connection between them?  

5.4.6.4	Can I change the "record" size?  
5.4.6.5	When would I want a block size that is different from the default?  
	1KB is the size of writes used by dd or whatever.  QIC specifies 
	512 byte records (well at least its what people use..)  Whatever 
	you write in will be broken into 512 byte sections.  They must be 
	multiples of 512 though.

	If you have written to a tape, a close will automatically append a 
	filemark (eof mark).  You may read the 512 byte blocks back as 
	512 byte records or as 1024 byte records (in which case you'll 
	get 2 at once).  The bigger the unit, the more efficient.

5.4.7a	How do I write several archives to a single tape?  I tried without 
	success:
		$ st -f /dev/rst4 rewind
		$ tar cf /dev/nst4 archive1
		$ st -f /dev/nrst4 weof
		$ tar cf /dev/nst4 archive2
		$ st -f /dev/nrst4 weof

	First:  throw away the block devices.

	'n' stands for 'No-Rewind-on-close' and will leave the tape 
	positioned ready for another file e.g.

		tar -cf /dev/nrst0 archive1
		tar -cf /dev/nrst0 archive2




5.4.8b	Later I would expect to be able to access, say, archive3 via the fsf
	directive to skip over the first two archives.  What is the correct
	sequence?

		st -f /dev/nrst0 rewind
		st -f /dev/nrst0 fsf 2
		tar -xf /dev/rst0 {files}


5.4.9	Since the Viper 150 writes on QIC-150/120, I guess I don't need 
	to worry about writing variable-length records?  How about reading 
	a tape written with variable-length records.  Is this possible 
	with the Viper?  If so, what's involved?


	Who would have written it? :-)

	Presently you can't.  You`re right.  Don't worry about it.

	The new 'st' changes will change this somewhat, though.

5.4.10	The very scant documentation that came with my drive mentions
	a "selectable buffer disconnect size," whose default is 16K.
	This is evidently the "maximum number of bytes that can be 
	sent over the SCSI bus during a single data transfer phase."  
	What's that?  How is it connected st's "blocksize" command?  
	Do I want to use 16K blocks, or might I even want to set the 
	disconnect size to a higher value?

	This suggests that 32 512 blocks will be written at a time.
	This jives with the tape format for some of the lower density 
	cartridges (QIC-40 and 80, for example).  The tape is written 
	in blocks of 32 512-byte blocks, with the last three being used
	for Error Correction Codes.  

	Use dd or tar with 16 k blocks and 32 x 512 byte blocks will be 
	written.

5.4.11	What is "streaming"?  When I tar a directory of files to tape,
	I notice that the tape often stops.  Streaming means it doesn't 
	stop?  How would I get the viper 150 to stream using tar or cpio 
	or dump?

	Use a bigger write size... (more efficient)  Try 16k blocks.


5.4.12	Where are all the answers to the above and related questions 
	written down?  Neither on the net nor in the 4.3BSD manuals 
	nor Administration text which I have could I find this stuff 
	covered!

	They are in the FAQ :-)...


5.4.13	What else should I know?  For example, it seems that a new tape 
	must stretched.  How is this done?

	Use a blowtorce and a pair of pliers.  Or you can run the tape 
	through a complete fast forward/rewind cycle to get it tight on
	the spindles.


5.5	Network
5.6	Marc Mengel's <mengel@fnal.gov> driver list

	Well, since replies to my request for information on
	drivers dried up a few weeks ago; here is the list.
	I got more replies from folks wanting drivers than
	from folks who'd done them.

	Hopefully this posting will inspire folks whose drivers
	aren't on the list to send me information on their stuff,
	and I'll add it in.

	If there is continued interest I'd be willing to turn this
	over to the FAQ folks, or maintain it as a separate FAQ 
	posting for comp.os.386bsd.announce or some such.

	Here is the form to submit new entries to the list:

      Driver Name:
    Author's Name:
   Author's Email:
Devices Supported:
 Number Supported:
 Interrupt driven:
 External Symbols:
        Size info:
     Availability:
            Sites:
        Stability:
     Restrictions:
         Comments:

	Here is the list received to date:
-----
       Driver Name: fdc
     Author's Name: Jesus Monroy Jr.
    Author's Email: jmonroy@netcom.com, et al. (to follow)
 Devices Supported: NEC765, Intel8272
  Number Supported: 8 projected (1 works now)
  Interrupt driven: Y
  External Symbols: (fdopen, fdclose, TBA)
	 Size info: (N/A (projected to add 1k to kernel))
      Availability: (TBA)
	     Sites: (TBA)
	 Stability: (in BETAS)
      Restrictions: (UCB Copyright)
     Delivery Date: June '93
 
-----
       Driver Name: rtc (CMOS clock)
     Author's Name: Jesus Monroy Jr.
    Author's Email: jmonroy@netcom.com, et al. (to follow)
 Devices Supported: Motorola CMOS 16458? (must double check)
  Number Supported: 1
  Interrupt driven: (Y)
  External Symbols: (TBA)
	 Size info: (N/A)
      Availability: (TBA)
	     Sites: (TBA)
	 Stability: (starts 5-17-93)
      Restrictions: (UCB Copyright)
     Delivery Date: July '93
 
-----
       Driver Name: QIC-40/80
     Author's Name: Jesus Monroy Jr. (to follow(6+))
    Author's Email: jmonroy@netcom.com, et al. (to follow(6+))
 Devices Supported: QIC-117 (standard) via NEC765, Intel8272
  Number Supported: (TBA)
  Interrupt driven: (Y (sometimes))
  External Symbols: (TBA)
	 Size info: (N/A)
      Availability: (TBA)
	     Sites: (TBA)
	 Stability: (starts 5-7-93; design in progress)
      Restrictions: (UCB Copyright)
     Delivery Date: (TBA (I project Aug. '93))

-----
      Driver Name: com
    Author's Name: Serge V.Vakulenko
   Author's Email: vak@kiae.su
Devices Supported: multiport UART adapters
 Number Supported: up to 5
 Interrupt driven: Yes, with lost interrupts recovery
 External Symbols: comopen, comclose,...
	Size info: text    data    bss     dec     hex
		   5204    264     0       5468    155c
     Availability: mail
	    Sites: from the author
	Stability: Solid
     Restrictions: Free Copyright
	 Comments: during autoconfiguration makes full testing
			of hardware (algorithm taken from sas)

-----
       Driver Name: co ("codrv") console driver
     Author's Name: Holger Veit
    Author's Email: Holger.Veit@gmd.de
 Devices Supported: Keyboard, CGA/MDA/EGA/VGA/SVGA
  Number Supported: 1
  Interrupt driven: Keyboard INT 1
  External Symbols: coopen,coclose,coread,coselect,coioctl,comap,
			pcopen,pcclose,pcread,pcwrite,pcioctl,pcmmap,
			crtat, sput, getchar,putchar, and many more
			
	 Size info: large, several modules
      Availability: ftp
	     Sites: latest version is codrv-0.1.2-030593.tar.z (gzip)
		    ftp.uni-duisburg.de:/pub/unix/386bsd-0.1/unofficial/codrv
		    bsd386.first.gmd.de:~veit/codrv
		    (login with 'guest', passwd 'guest')
		    bsd.coe.montana.edu:/pub/codrv
		    agate.berkeley.edu:/pub/incoming/codrv-0.1.2-030593.tar.z
	 Stability: quite stable
      Restrictions: BSD Copyright
-----
     Package Name: patchkit
    Editor's Name: Rodney Grimes
   Editor's Email: rgrimes@agora.rain.com 
     Availability: ftp
	    Sites: agate.berkeley.edu, bsd.coe.montana.edu, etc.(ask archie)
	Stability: Excellent
     Restrictions: 
	 Comments: 
-----
       Driver Name: shlib
     Author's Name: Joerg Lohse  
    Author's Email: lohse@tech7.informatik.uni-hamburg.de 
 Devices Supported: -
  Number Supported: -
  Interrupt driven: -
  External Symbols: -
	 Size info: 
      Availability: 
	     Sites: agate.berkeley.edu:unofficial/fromref/sys.extras
	 Stability: ?
      Restrictions: ?
-----
      Driver Name: "mse"
    Author's Name: Rick Macklem (patches by Eugene W. Stark)
   Author's Email: rick@snowhite.cis.uoguelph.ca, stark@cs.sunysb.edu
Devices Supported: Bus mouse
 Number Supported: "n", where n >= 0 (but I have only 1)
 Interrupt driven: Y
 External Symbols: mseopen, mseclose, mseread, mseselect
	Size info: text	data	bss	dec	hex
		   1484	72	0	1556	614
     Availability: E-mail to stark@cs.sunysb.edu, FTP to cs.sunysb.edu
	    Sites: cs.sunysb.edu, in pub/386BSD
	Stability: Sometimes generates phantom events when system is under load.
     Restrictions: "Do anything, but preserve this notice" copyright.
-----
      Driver Name: "tw"
    Author's Name: Eugene W. Stark
   Author's Email: stark@cs.sunysb.edu
Devices Supported: TW-523 X-10 carrier current modem for home control
 Number Supported: "n", where n >= 0 (but I have only 1)
 Interrupt driven: Y
 External Symbols: twopen, twclose, twread, twwrite, twselect
	Size info: text	data	bss	dec	hex
		   2944	560	0	3504	db0
     Availability: E-mail to author for most recent version + s/w,
			FTP not updated too frequently
	    Sites: cs.sunysb.edu, in pub/386BSD
			(older version on agate.berkeley.edu in "from-ref")
	Stability: Solid
     Restrictions: BSD-style copyright.
-----
       Driver Name: js, Joystick
     Author's Name: Juha Nurmela
    Author's Email: junki@lut.fi
 Devices Supported: Standard PC joysticks, LDResistors,...
  Number Supported: 2, more with "tweaked" cards
  Interrupt driven: No, polled with configurable timeouts, dflt 1/5 sec.
  External Symbols: jsopen, jsclose, ...
	 Size info: ??? (very small)
      Availability: mail
	     Sites: None
	 Stability: Solid (no guarantees though)
      Restrictions: None whatsoever
	     Blah: select()able, nonblocking/blocking io.
-----
      Driver Name: pcvt - VT220 virtual console driver
    Author's Name: Hellmuth Michaelis (and many others!)
   Author's Email: hm@hcshh.hcs.de
Devices Supported: MDA / CGA / EGA / VGA
 Number Supported: 1
 Interrupt driven: Keyboard=YES/Video=NO
 External Symbols: 
	Size info: ca. 64k (4 .o modules)
     Availability: alt.sources, ftp from agate and others
	    Sites: i.e. agate.berkeley.edu
	Stability: stable
     Restrictions: BSD Copyright

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TSgt Dave Burgess
NCOIC AL/Management Information Systems Office
Brooks AFB, TX