Re: Ziatech 5503 watchdog driver

From: M. Warner Losh (imp_at_bsdimp.com)
Date: 03/20/05

  • Next message: Steve Kargl: "Re: Support for Tyan Thunder K8SR w/ Adaptec 7902 under AMD64" 
    Date: Sat, 19 Mar 2005 23:02:30 -0700 (MST)
To: dodell@offmyserver.com

    In message: <20050319080215.GX51688@smp500.sitetronics.com>
                "Devon H. O'Dell " <dodell@offmyserver.com> writes:
    : On Fri, Mar 18, 2005 at 03:55:53PM -0700, Warner Losh wrote:
    : > > I'm busy writing a Ziatech 5503 watchdog driver for FreeBSD (and
    : > > porting all the watchdog stuff to DragonFly BSD) and Plan 9. For my
    : > > driver, I have no way to identify that the system has the driver, so
    : > > I wanted to make it conditional on
    :
    : Rather, I have no way to identify that the system has the device :).
    :
    : > > options ZT5503
    : >
    : > That's not a good enough reason to make it an option, it should really
    : > be a device. Users that want it can add it to their kernel config.
    : > In fact, they'd have to add it either way, so why make it weird for
    : > them.
    : >
    : > Put this device on the ISA bus, give it an identify routine that
    : > always adds it (this isn't GENERIC safe, but since there's no way to
    : > know the device is there, you are stuck with that).
    :
    : OK. I don't know a hell of a lot about how the ISA bus works, though
    : I suppose that I remember that things using the old SB 16 cards
    : (Wolfenstein, anyone?) would simply probe various I/O ports.

    :-) Yes. Usually one does try to probe for things, but the devices
    must be cooperative.

    : Unfortunately, in my case, there are really no board specific I/O
    : registers that will give me information I can detect (or so it seems
    : from the manufacturer's manuals), though I am going to write a
    : couple of tests today to read some of these registers and see if
    : there is any useful information contained within them which I
    : might use to probe.

    Right. That's too bad, but with somehardware that's what you get.

    : Assuming no useful information exists, is it enough to let the
    : device attach regardless if the user has
    :
    : device zt5503
    :
    : in the configuration file? Maxime suggested that I use device hints
    : to gather the port and such. Where should I put these hints? NOTES?

    /boot/device.hints and also NOTES.

    : If I understand correctly, to hook this up into the build, I will
    : still have a line in files which will look something like:
    :
    : dev/ziatech/zt5503.c optional zt5503

    Yes.
     
    : Hm, Ziatech is now Performance Technologies. Should that perhaps be
    : dev/pt then instead?

    We generally don't have directories for manufacturers.

    : Thanks for the help!

    No problem.

    Warner
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  • Next message: Steve Kargl: "Re: Support for Tyan Thunder K8SR w/ Adaptec 7902 under AMD64"

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