Hello Steve, Steve Sakoman wrote: > On OMAP36/37XX the standard on chip pullups are not sufficient to > ensure proper i2c operation without external pullups or switching > to high speed mode and enabling special on chip pullups. > > This is an issue for Beagle xM, which does not have external pullups > on the expansion board i2c lines. > > The issue manifests itself as an AL (arbitration lost) error when > probing for a non-existent device (i.e. on a Beagle xM with no expansion > boards attached). This issue does not occur on expansion boards that > include pullups or on Overo 37XX COM's since they include pull-ups. > > This patch fixes the issue by checking for the AL bit in the i2c_probe > function. > > Signed-off-by: Steve Sakoman <[email protected]> > ---
Tested it here on my beagle board too, thanks! Texas Instruments X-Loader 1.4.2 (Feb 19 2009 - 12:01:24) U-Boot 2010.09-04580-g4df6689 (Oct 25 2010 - 07:57:35) OMAP3530-GP ES3.0, CPU-OPP2, L3-165MHz, Max CPU Clock 600 mHz OMAP3 Beagle board + LPDDR/NAND I2C: ready [...] Applied to u-boot-i2c master bye, Heiko -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
