Date: Fri, 08 Dec 2006 22:32:00 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: ticso@cicely.de, ticso@cicely12.cicely.de Cc: freebsd-arm@freebsd.org Subject: Re: questions about current RM9200 state Message-ID: <20061208.223200.-1303464500.imp@bsdimp.com> In-Reply-To: <20061208114906.GJ54209@cicely12.cicely.de> References: <20061207.205008.-432839162.imp@bsdimp.com> <20061208104227.GH54209@cicely12.cicely.de> <20061208114906.GJ54209@cicely12.cicely.de>
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In message: <20061208114906.GJ54209@cicely12.cicely.de>
Bernd Walter <ticso@cicely12.cicely.de> writes:
: On Fri, Dec 08, 2006 at 11:42:28AM +0100, Bernd Walter wrote:
: > On Thu, Dec 07, 2006 at 08:50:08PM -0700, M. Warner Losh wrote:
: > > In message: <20061208015032.GF54209@cicely12.cicely.de>
: > > Bernd Walter <ticso@cicely12.cicely.de> writes:
: > > : But I can't probe the bus from userland:
: > > : [56]arm9# ./iic_probe /dev/iic0
: > > : - and nothing listed.
: > >
: > > twi doesn't support START/STOP ioctls that you use. Hmmm, that's in
: > > p4 that I've removed them because I never got that working. I also
: > > think the version in -head isn't the latest, working one. I think you
: > > do the same thing with a 0 byte transfer. Except we don't detect
: > > NOACK quite right yet, I'm afraid. I'd expect an error each time you
: > > tried.
: >
: > Ah - Ok, will switch to 0 Byte transfers and retest.
:
: iic.c:
: case I2CWRITE:
: if (s->count <= 0) {
: error = EINVAL;
: break;
: }
:
: Well - it wouldn't work without NOACK detection anyway.
I think a zero-byte transfer would do it.
I've not updated iicsmb to use the new transfer paradigm. That's my
bad.
Warner
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