Hi Andre, [EMAIL PROTECTED] wrote on : > All, > > in my current system the I2C bus is not working properly on a MPC8343 > in > u-boot v1.3.2. > > i2c board config includes : > > #define CONFIG_HARD_I2C > #undef CONFIG_SOFT_I2C > #define CONFIG_FSL_I2C > #define CONFIG_I2C_MULTI_BUS > #define CONFIG_I2C_CMD_TREE > #define CFG_I2C_OFFSET 0x3000 > #define CFG_I2C2_OFFSET 0x3100 > #define CFG_I2C_SPEED 100000 > #define CFG_I2C_SLAVE 0x7F > > > chip probing works fine. > > mvBL-M7> i2c probe > Valid chip addresses: 30 48 50 68 > > reading the Chips gives all "ff" > > mvBL-M7> i2c md 50 0 10
Uh, it seems I lag behind in U-Boot evolution. I know this "i2c md" command as "imd"? > 0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ................ Devices with address 50 normally are EEPROMs. If this device is an EEPROM, are you sure it contains data other than 0xff? The number of address bytes a device needs is varying. Your could look up the correct address length in the datasheet of your device, or try it manually: imd 50.0 0 10 imd 50.1 0 10 imd 50.2 0 10 One of this should work. > Observing the I2C bus wires show that everything _works excellent_ : > 100kHz speed as well as all data seems ok - but u-boot shows "ff". > > BTW: Fetching HRCW from I2C is also working fine. > > After some tries (i2c md ..) the bus hangs and no more transactions > can > be seen on the bus. One reason for a hanging bus could be a lost clock pulse. This could happen, if the low->high rise time of the bus signal is longer than the clock pulse width. For testing you could try a lower bus clock (10 kHz for example). Best Regards, Martin Krause -- TQ-Systems GmbH Muehlstrasse 2, Gut Delling, D-82229 Seefeld Amtsgericht Muenchen, HRB 105 018, UST-IdNr. DE 811 607 913 Geschaeftsfuehrer: Dipl.-Ing. (FH) Detlef Schneider, Dipl.-Ing. (FH) Ruediger Stahl http://www.tq-group.com ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ U-Boot-Users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/u-boot-users
