From: David Bruce <dbruce@ll.mit.edu>
To: linuxppc-embedded@ozlabs.org
Subject: Re:problem opening I2C device on MPC8260
Date: Mon, 14 Mar 2005 14:18:31 -0500 [thread overview]
Message-ID: <4235E387.4000807@ll.mit.edu> (raw)
Look back into the February logs of this group that was having simular
discussions.
In short:
a.) 2.6 has some problems with the I2C. You may have to port over 2.4
i2c code. I don't know the specific details.
b.) you need an adapter interface to create your device(s) (/dev/i2c-0).
See ./drivers/i2c/i2c-pm826.c. You should be able to use this untouched.
It is part of the configuration in 2.4.x.
c.) The 2.4 version of i2c-algo-8260.c has a potential bug where all the
__pa()'s need to be replaced by iopa().
I am using 2.4.24 of the ELDK and had problems with the i2c. Items b & c
corrected them except that with "b" I had to load it *after* boot as a
module. Don't know why but it works and have successfully used the i2c
since.
--
David Bruce
MIT Lincoln Laboratory
244 Wood Street
Lexington, MA 02420
781.981.3863
mailto:dbruce@ll.mit.edu
reply other threads:[~2005-03-14 19:38 UTC|newest]
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