From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Nelson Date: Mon, 4 Feb 2013 10:03:10 -0600 Subject: [U-Boot] [PATCH 1/2] beagle: expansion boards: retry i2c_read with 16bit addressing Message-ID: <1359993790-22454-1-git-send-email-robertcnelson@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Some expansion boards now ship with at24 eeproms that need to communicate via 16bit addressing. Signed-off-by: Robert Nelson --- 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; -- 1.7.10.4