Date: Thu, 20 Jan 2000 21:45:43 -0500 (EST) From: "Matthew N. Dodd" <winter@jurai.net> To: Warner Losh <imp@village.org> Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: aha question Message-ID: <Pine.BSF.4.21.0001202137180.462-100000@sasami.jurai.net> In-Reply-To: <200001210222.TAA07743@harmony.village.org>
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On Thu, 20 Jan 2000, Warner Losh wrote:
> How important is hard wiring a aha device? I'm reworking the aha
> driver to support probing for the self identification and to better
> support plug and play. In order to do this, I have created an
> identify routine which scans all the devices in the traditional self
> probing order and adds device children as needed. The only problem
> with this that I can see is that it destroys the ability to hardwire
> aha instances to unit numbers in the config file. While no pci
> drivers support this, and the isa ep driver provide strong evidence
> that I don't need to support this, I thought I'd ask here.
Well, I'd argue that you don't need to support hardwired devices but thats
only because I was too lazy to properly solve the possible contentions b/t
devices found in the IDENTIFY and devices hardcoded and provided by the
ISA hint mechanism.
Basically, inside the loop of your IDENTIFY method you'll need something
like this:
while (find_cards) {
found = look_for_card(address);
if (found) {
err = devclass_get_devices(devclass, &listp, &count);
if (!err & count)
for (i = 0; i < count; i++) {
bus_get_resource(listp[i], SYS_RES_IOPORT,
0, &io_start, &io_count);
if (io_start == address) {
/* cleanup listp etc */
/* "He says they've already got one! */
continue;
}
}
}
}
> Also, if I need to support this, how would I go about doing that?
Like above. :)
Good luck; if you implement this we should probably think about
generalizing it so everyone can use it.
--
| Matthew N. Dodd | '78 Datsun 280Z | '75 Volvo 164E | FreeBSD/NetBSD |
| winter@jurai.net | 2 x '84 Volvo 245DL | ix86,sparc,pmax |
| http://www.jurai.net/~winter | This Space For Rent | ISO8802.5 4ever |
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