Re: Popisy rozhrani

From: Jiri Novotny <novotny@MUNI.CZ>
Subject: Re: Popisy rozhrani
Date: Mon, 26 Jun 1995 11:35:13 +0200
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>
>     Dobry den.
>
>     Dovolim si tuto konferenci pouzit k nasledujici otazce - nemate nekdo
> pointer na nebo primo popis rozhrani ATA-2 (ovladani IDE disku) a ATAPI
> (ovladani AT CD ROM). Uz to schanim (neuspesne) velmi dlouho po celem svete a
> bud neznam ta spravna mista nebo to nikde neni ...
>
>                                  Tisicere diky
>                                                     Dan
>
 
Treba Vam to pomuze
 
 
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To: old-bsdi-users@steinkamm.com, bsdi-users@bsdi.com
Subject: IDE/ATAPI CDROM driver beta test
Date: Sun, 25 Jun 1995 23:10:03 -0600
From: Eric Varsanyi <ewv@bsdi.com>
Status: RO
 
[I posted this after the list melted down so I'm not sure how far it got,
 apologies if you are seeing this more than once. -Eric]
 
Hello bsdi-users,
 
        I've recently completed the ATAPI IDE driver and am looking
for some additional beta testers. If you have an ATAPI CDROM (or
tape) and would like to help us check it out before release I would
like to hear from you.
 
        If you know of someone who would be interested in helping with
a beta test of this driver please pass this note along.
 
Some notes:
 
        - You must be running (or willing to run) 2.0 or higher. Depending
          on the circumstances I might ask you to apply some additional
          kernel patches.
 
        - Since the ATAPI driver required modifications to the 'wd' driver
          there is a chance that data on a wd drive will be at risk.
 
        - If there are problems you must be willing to work with
          me (for a reasonable period of time) to try to resolve
          them. This might include running gdb and dumping variables
          from a running system or from a crash dump. It may also
          include receiving and installing debugging patches to
          the kernel to help isolate a problem. I'll provide technical
          support related to this beta (even if you don't have a support
          contract) as long as your willing to work with me to resolve
          problems that come up.
 
        - Source or binary customers are welcome.
 
        - This driver modifies the kernel only, installing it basically
          requires running a script that comes with the beta kit
          to unpack the sources or binaries, modifying your kernel
          configuration file to add the 'wdpi' device driver,
          building a kernel and rebooting.
 
        - I'm interested in testing installs from ATAPI CDROM, with the
          root device being on the same cable or not (even with a SCSI
          root). Please let me know if you want to try an install.
 
        - I'm also interested in anyone who has an older ST-506 style
          disk controller (MFM, RLL, ESDI). Given that the wd driver
          had to be modified I would like to check it out on some of
          the older controllers.
 
So, what is ATAPI?
 
        ATAPI is an SFF (Small Form Factor Committee) standard that
basically allows the SCSI protocol to run across an IDE interface.
ATAPI CDROM's (and tapes eventually) are more or less SCSI devices
with an IDE electrical interface. The ATAPI driver for BSD/OS looks
like a drive to the 'wdc' (IDE controller) driver and looks like
a SCSI host bus adapter (like 'aha' or 'sa') to the SCSI layers.
The CDROM thus appears as an 'sd' device to the user (administrator).
This is all intended to provide a standard CDROM (and tape) interface
and reduce the proliferation of proprietary CDROM interfaces. As
a bonus, almost everyone has an IDE interface or can get one for
a very low cost. Many motherboards have IDE interfaces built in.
 
        An ATAPI drive can be used in much the same physical
configurations as an IDE hard drive, with the exception that it
can't be booted from directly (this is a BIOS restriction). Typical
configurations might be:
 
        IDE master      IDE slave       2nd IDE master  Root
        ----------      ----------      --------------  --------
        IDE (wd0)       ATAPI (wdpi0)   -               wd0a
        ATAPI           -               -               sd0a
        IDE (wd0)       IDE (wd1)       ATAPI (wdpi0)   wd0a
 
        Other configurations are possible, you should be able to run 2
ATAPI CDROM drives on the same cable for instance.
 
        Thanks for reading this far, if you are still interested
I would like to hear from you. Depending on the response volume I
may have to select fewer testers than responded to keep things sane
(for me).
 
-Eric Varsanyi
 Berkeley Software Design Inc.
 ewv@bsdi.com
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