[U-Boot-Users] I2C @ MPC8343

[Ben Warren]

Hi Andre,

On Thu, Apr 10, 2008 at 4:37 AM, Andre Schwarz
<andre.schwarz at matrix-vision.de> wrote:
> 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
>  0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
>
>
>  Observing the I2C bus wires show that everything _works excellent_ :
>  100kHz speed as well as all data seems ok - but u-boot shows "ff".
>

The fact that probing works and your scope shows bits toggling leads
me to believe that your command syntax is the problem.
Please try something like: "i2c md 50.1 0 10".  I2C syntax is a bit
goofy - you often have to specify the bus width.  I've used 1.3.2
successfully on an MPC8349 (same as yours) with and without Timur's
speed patches.

regards,
Ben