----- Original Message ----- From: "Pagnotta, Chris" <[EMAIL PROTECTED]> To: <linuxppc-embedded at lists.linuxppc.org> Sent: Tuesday, April 22, 2003 8:48 PM Subject: I2C having issues
> > I tried a couple of things to to get the i2c device up and working and I > am stil having some problems. The I2C registers are mappped to internal > memory at address 0xEF60500. I cannot write to this address and read back > the same values. Here is the output from just the ep405 bootloader. > Chris, there was a bug in 2.4.17 which we are using, where a typo in #if caused the I2C to be in power-save mode. This gave the symptoms of the I2C module not responding at all. This is the diff: Index: ppc4xx_setup.c =================================================================== RCS file: /P2/Hawkeye557/CVS_Repository/Hawkeye557/Linux-405GP/Talon-MVL/linux-2.4.17_ mvl21-talonbsp/arch/ppc/kernel/ppc4xx_setup.c,v retrieving revision 1.1.1.2 retrieving revision 1.1.1.3 diff -c -r1.1.1.2 -r1.1.1.3 *** ppc4xx_setup.c 3 Jan 2003 17:42:34 -0000 1.1.1.2 --- ppc4xx_setup.c 4 Apr 2003 14:23:01 -0000 1.1.1.3 *************** *** 104,111 **** value |= CPM_GPIO0; #endif ! #if !defined(CONFIG_PPC405_I2C_ADAP) ! value |= CPM_IIC0; value |= CPM_IIC1; #endif --- 104,111 ---- value |= CPM_GPIO0; #endif ! #if !defined(CONFIG_I2C_PPC405_ADAP) ! value |= CPM_IIC0; value |= CPM_IIC1; #endif -- Mark Powell, Senior Software Engineer, Primagraphics Limited New Cambridge House, Litlington, nr.Royston, Herts, SG8 0SS, UK Tel. +44 1763 852222, Fax. 853324, http://www.primagraphics.co.uk ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
