Date: Sat, 19 Mar 2005 23:02:30 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: dodell@offmyserver.com Cc: freebsd-hackers@freebsd.org Subject: Re: Ziatech 5503 watchdog driver Message-ID: <20050319.230230.35850068.imp@bsdimp.com> In-Reply-To: <20050319080215.GX51688@smp500.sitetronics.com> References: <20050318160528.GQ51688@smp500.sitetronics.com> <20050318.155553.41699848.imp@bsdimp.com> <20050319080215.GX51688@smp500.sitetronics.com>
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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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