Xilinx ML403 I2C Problems

Wed May 14 01:25:42 EST 2008

Check the Xilinx website for i2c pullup changes for the ML403 if you
haven't done that already.  There's a level shifter involved in there
too.  The app-note/errata explains what's happening.

Note that the default eeprom device is a 48T02, I believe.  Which has
two pages of 256 bytes, the low i2c address bit used to address the
page, and the other i2c address bits ignored, so this eeprom is
replicated across the whole eeprom range.

It's been a year since I messed with this, the above is from memory
(mine), so be skeptical.

> -----Original Message-----
> From: linuxppc-embedded-bounces+bruno.bittner=gefanuc.com at ozlabs.org
>
[mailto:linuxppc-embedded-bounces+bruno.bittner=gefanuc.com at ozlabs.org]
On
> Behalf Of Aaron Sells
> Sent: Tuesday, May 13, 2008 10:12 AM
> To: linuxppc-embedded at ozlabs.org
> Subject: Xilinx ML403 I2C Problems
> 
> Hello,
> 
> I am having troubles accessing the eeprom on our Xilinx ML403 board.
It
> is running an up to date kernel pulled from the git.xilinx.com tree.
I
> am running an OpenEmbedded file system.  I am using I2C Tools
> [http://www.lm-sensors.org/wiki/I2CTools] to probe the I2C bus.  I am
> using Xilinx EDK 10.1 and the base system builder wizard to generate
my
> bitstream.  The following are I2C related messages during bootup:
> 
> > root at xilinx-ml403:~# dmesg | grep i[i2]c
> > [    0.126379] Registering device xilinx_iic:0
> > [    0.186921] i2c-core: driver [dummy] registered
> > [   11.729656] i2c /dev entries driver
> > [   11.770185] i2c-core: driver [dev_driver] registered
> > [   11.772527] i2c-core: driver [eeprom] registered
> > [   11.772951] I2C adapter driver [xilinx_iic.0] forgot to specify
> physical device
> > [   11.774135] i2c-adapter i2c-0: adapter [xilinx_iic.0] registered
> > [   11.775475] i2c-dev: adapter [xilinx_iic.0] registered as minor 0
> > [   11.775569] i2c-adapter i2c-0: found normal entry for adapter 0,
addr
> 0x50
> > [   11.775640] i2c-adapter i2c-0: master_xfer[0] W, addr=0x50, len=0
> > [   11.775710] i2c-adapter i2c-0: master_xfer[0] W, addr=0x50, len=0
> > [   11.776245] i2c-adapter i2c-0: client [eeprom] registered with
bus id
> 0-0050
> > [   11.776364] i2c-adapter i2c-0: found normal entry for adapter 0,
addr
> 0x51
> > [   11.776441] i2c-adapter i2c-0: master_xfer[0] W, addr=0x51, len=0
> > [   11.776510] i2c-adapter i2c-0: master_xfer[0] W, addr=0x51, len=0
> > [   11.776847] i2c-adapter i2c-0: client [eeprom] registered with
bus id
> 0-0051
> > [   11.776957] i2c-adapter i2c-0: found normal entry for adapter 0,
addr
> 0x52
> > [   11.777034] i2c-adapter i2c-0: master_xfer[0] W, addr=0x52, len=0
> > [   11.777102] i2c-adapter i2c-0: master_xfer[0] W, addr=0x52, len=0
> > [   11.777414] i2c-adapter i2c-0: client [eeprom] registered with
bus id
> 0-0052
> > [   11.777526] i2c-adapter i2c-0: found normal entry for adapter 0,
addr
> 0x53
> > [   11.777603] i2c-adapter i2c-0: master_xfer[0] W, addr=0x53, len=0
> > [   11.777671] i2c-adapter i2c-0: master_xfer[0] W, addr=0x53, len=0
> > [   11.778053] i2c-adapter i2c-0: client [eeprom] registered with
bus id
> 0-0053
> > [   11.778169] i2c-adapter i2c-0: found normal entry for adapter 0,
addr
> 0x54
> > [   11.778249] i2c-adapter i2c-0: master_xfer[0] W, addr=0x54, len=0
> > [   11.778317] i2c-adapter i2c-0: master_xfer[0] W, addr=0x54, len=0
> > [   11.778708] i2c-adapter i2c-0: client [eeprom] registered with
bus id
> 0-0054
> > [   11.778821] i2c-adapter i2c-0: found normal entry for adapter 0,
addr
> 0x55
> > [   11.778905] i2c-adapter i2c-0: master_xfer[0] W, addr=0x55, len=0
> > [   11.778974] i2c-adapter i2c-0: master_xfer[0] W, addr=0x55, len=0
> > [   11.779296] i2c-adapter i2c-0: client [eeprom] registered with
bus id
> 0-0055
> > [   11.779406] i2c-adapter i2c-0: found normal entry for adapter 0,
addr
> 0x56
> > [   11.779487] i2c-adapter i2c-0: master_xfer[0] W, addr=0x56, len=0
> > [   11.779556] i2c-adapter i2c-0: master_xfer[0] W, addr=0x56, len=0
> > [   11.779881] i2c-adapter i2c-0: client [eeprom] registered with
bus id
> 0-0056
> > [   11.780180] i2c-adapter i2c-0: found normal entry for adapter 0,
addr
> 0x57
> > [   11.780275] i2c-adapter i2c-0: master_xfer[0] W, addr=0x57, len=0
> > [   11.780346] i2c-adapter i2c-0: master_xfer[0] W, addr=0x57, len=0
> > [   11.780695] i2c-adapter i2c-0: client [eeprom] registered with
bus id
> 0-0057
> > [   11.780779] i2c-adapter i2c-0: master_xfer[0] W, addr=0x57, len=1
> > [   11.780828] i2c-adapter i2c-0: master_xfer[1] R, addr=0x57, len=1
> > [   11.796088] xilinx_iic.0 #0: Could not talk to device 0x57 (0),
bus
> always busy, trying to reset
> > [   11.884076] i2c-adapter i2c-0: master_xfer[0] R, addr=0x57, len=1
> > [   11.900084] xilinx_iic.0 #0: Could not talk to device 0x57 (0),
bus
> always busy, trying to reset
> > [   11.988074] i2c-adapter i2c-0: master_xfer[0] R, addr=0x57, len=1
> > [   12.004086] xilinx_iic.0 #0: Could not talk to device 0x57 (0),
bus
> always busy, trying to reset
> > [   12.096076] i2c-adapter i2c-0: master_xfer[0] R, addr=0x57, len=1
> > [   12.112084] xilinx_iic.0 #0: Could not talk to device 0x57 (0),
bus
> always busy, trying to reset
> > [   12.200151] xilinx_iic.0 #0 at 0x81600000 mapped to 0xC5060000,
irq=4
> 
> Also, occasionally the board will hang during bootup during the I2C
> device initialization.  This is what I get when I try to read from the
> eeprom memory locations:
> 
> > root at xilinx-ml403:~/i2c-tools-3.0.1/tools# ./i2cget 0 0x50
> > Error: Could not set address to 0x50: Device or resource busy
> > root at xilinx-ml403:~/i2c-tools-3.0.1/tools# ./i2cget 0 0x51
> > Error: Could not set address to 0x51: Device or resource busy
> > root at xilinx-ml403:~/i2c-tools-3.0.1/tools# ./i2cget 0 0x52
> > Error: Could not set address to 0x52: Device or resource busy
> > root at xilinx-ml403:~/i2c-tools-3.0.1/tools# ./i2cget 0 0x53
> > Error: Could not set address to 0x53: Device or resource busy
> > root at xilinx-ml403:~/i2c-tools-3.0.1/tools# ./i2cget 0 0x54
> > Error: Could not set address to 0x54: Device or resource busy
> > root at xilinx-ml403:~/i2c-tools-3.0.1/tools# ./i2cget 0 0x55
> > Error: Could not set address to 0x55: Device or resource busy
> > root at xilinx-ml403:~/i2c-tools-3.0.1/tools# ./i2cget 0 0x56
> > Error: Could not set address to 0x56: Device or resource busy
> > root at xilinx-ml403:~/i2c-tools-3.0.1/tools# ./i2cget 0 0x57
> > Error: Could not set address to 0x57: Device or resource busy
> 
> The following are the I2C defines in my xparameters_ml403.h file:
> 
> > sellsa at SS-SBIR-Ubuntu:~/linux-2.6-
> xlnx/arch/ppc/platforms/4xx/xparameters$ cat xparameters_ml403.h |
grep
> IIC
> > /* Definitions for driver IIC */
> > #define XPAR_XIIC_NUM_INSTANCES 1
> > /* Definitions for peripheral IIC_EEPROM */
> > #define XPAR_IIC_EEPROM_DEVICE_ID 0
> > #define XPAR_IIC_EEPROM_BASEADDR 0x81600000
> > #define XPAR_IIC_EEPROM_HIGHADDR 0x8160FFFF
> > #define XPAR_IIC_EEPROM_TEN_BIT_ADR 0
> > #define XPAR_IIC_EEPROM_GPO_WIDTH 1
> > /* Canonical definitions for peripheral IIC_EEPROM */
> > #define XPAR_IIC_0_DEVICE_ID XPAR_IIC_EEPROM_DEVICE_ID
> > #define XPAR_IIC_0_BASEADDR 0x81600000
> > #define XPAR_IIC_0_HIGHADDR 0x8160FFFF
> > #define XPAR_IIC_0_TEN_BIT_ADR 0
> > #define XPAR_IIC_0_GPO_WIDTH 1
> > #define XPAR_IIC_EEPROM_IIC2INTC_IRPT_MASK 0X000010
> > #define XPAR_XPS_INTC_0_IIC_EEPROM_IIC2INTC_IRPT_INTR 4
> > #define XPAR_INTC_0_IIC_0_VEC_ID
> XPAR_XPS_INTC_0_IIC_EEPROM_IIC2INTC_IRPT_INTR
> > #define XPAR_PERSISTENT_0_IIC_0_BASEADDR 0
> > #define XPAR_PERSISTENT_0_IIC_0_HIGHADDR 128
> > #define XPAR_PERSISTENT_0_IIC_0_EEPROMADDR 0x50
> 
> Any ideas on what could be going wrong?  Any ideas on how to
> troubleshoot this?
> 
> Regards,
> Aaron
> 
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