Some expansion boards now ship with at24 eeproms that need to communicate via 16bit addressing.
Signed-off-by: Robert Nelson robertcnelson@gmail.com --- board/ti/beagle/beagle.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/board/ti/beagle/beagle.c b/board/ti/beagle/beagle.c index b829a79..9493c6b 100644 --- a/board/ti/beagle/beagle.c +++ b/board/ti/beagle/beagle.c @@ -227,6 +227,14 @@ static unsigned int get_expansion_id(void) i2c_read(EXPANSION_EEPROM_I2C_ADDRESS, 0, 1, (u8 *)&expansion_config, sizeof(expansion_config));
+ /* retry reading configuration data with 16bit addressing */ + if ((expansion_config.device_vendor == 0xFFFFFF00) || + (expansion_config.device_vendor == 0xFFFFFFFF)) { + printf("EEPROM is blank or 8bit addressing failed: retrying with 16bit:\n"); + i2c_read(EXPANSION_EEPROM_I2C_ADDRESS, 0, 2, (u8 *)&expansion_config, + sizeof(expansion_config)); + } + i2c_set_bus_num(TWL4030_I2C_BUS);
return expansion_config.device_vendor;