Date: Wed, 15 Oct 2008 11:25:49 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: jhein@timing.com Cc: arm@freebsd.org, ticso@cicely.de Subject: Re: loadable drivers Message-ID: <20081015.112549.35219823.imp@bsdimp.com> In-Reply-To: <18678.7732.431604.484585@gromit.timing.com> References: <18677.7678.159413.615726@gromit.timing.com> <20081015162140.GQ25586@cicely7.cicely.de> <18678.7732.431604.484585@gromit.timing.com>
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In message: <18678.7732.431604.484585@gromit.timing.com>
John Hein <jhein@timing.com> writes:
: Bernd Walter wrote at 18:21 +0200 on Oct 15, 2008:
: > On Tue, Oct 14, 2008 at 04:32:30PM -0600, John Hein wrote:
: > > M. Warner Losh wrote at 15:34 -0600 on Oct 14, 2008:
: > > > In message: <20081015003842.a2bd682b.stas@FreeBSD.org>
: > > > Stanislav Sedov <stas@freebsd.org> writes:
: > > > : On Tue, 14 Oct 2008 14:25:32 -0600
: > > > : John Hein <jhein@timing.com> mentioned:
: > > > :
: > > > : > What needs to be done to support loadable drivers under arm/freebsd?
: > > > :
: > > > : I think they should work, aren't they?
: > > >
: > > > Build them... They work..
: > >
: > > Sorry for the poor problem statement. They do load, but I'm not
: > > getting into the probe or attach. At first I thought the load
: > > was failing, but that was driver error (pardon the pun).
: >
: > Then it is likely a driver or configuration specific problem.
: > One of the possible reasons is that you may missing hints, because many
: > devices in embedded systems don't support probing.
: > IIRC I already successfully loaded USB modules on AT91.
:
: Yes, it was my error... missing identify method. I've been using
: drivers parented to self-identifying busses for so long, I forgot
: that important little detail.
:
: Sorry for the gross misdirection.
:
: Note that loading the uftdi driver via kldload behaves differently on
: arm than when it's compiled into the kernel. It boils down to
: uaa->iface being NULL (in uftdi_match) in the former case and not NULL
: in the latter. I haven't tracked that down yet, but kldload works
: fine on x86.
There's issue with loading usb drivers because it was never designed
for that... Some drivers work, others don't.
Warner
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