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Wed, 29 Sep 2021 05:49:16 +0000 Received: from PS2PR04MB3589.apcprd04.prod.outlook.com ([fe80::208f:4cab:28d3:b0cf]) by PS2PR04MB3589.apcprd04.prod.outlook.com ([fe80::208f:4cab:28d3:b0cf%3]) with mapi id 15.20.4566.014; Wed, 29 Sep 2021 05:49:16 +0000 From: Kumar Thangavel To: "openbmc@lists.ozlabs.org" Subject: EEPROM Validation issue in Fru Device. Thread-Topic: EEPROM Validation issue in Fru Device. 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Classification: Confidential Hi All, We are working in FRU module that has 16 bit EEPROM and Wanted t= o read eeprom data Via i2c. The below function in FruDevice.cpp in entity-manager validates = 8bit or 16 bit device. This function returns "0" for 8 bit device. This function returns "0" for 16 bit device also. But it's suppo= sed to return "1" for 16 bit device. We have tested with our 16bit device. It returns "0" only. If we read via i2c utility commands, getting all 255 data in th= e first bytes. If we make code changes to return "1" for 16 bit device and call= ed the function "i2cSmbusWriteThenRead", then we could able to read all the data perfectly for 16 bit dev= ice. Code snippet : static int isDevice16Bit(int file) { /* Get first byte */ int byte1 =3D i2c_smbus_read_byte_data(file, 0); if (byte1 < 0) { return byte1; } /* Read 7 more bytes, it will read same first byte in c= ase of * 8 bit but it will read next byte in case of 16 bit */ for (int i =3D 0; i < 7; i++) { int byte2 =3D i2c_smbus_read_byte_data(file, 0); if (byte2 < 0) { return byte2; } if (byte2 !=3D byte1) { return 1; } } return 0; } I2c utility command log : i2ctransfer 12 w2@0x51 0x00 0x00 r8 WARNING! This program can confuse your I2C bus, cause data loss and wors= e! I will send the following messages to device file /dev/i2c-12: msg 0: addr 0x51, write, len 2, buf 0x00 0x00 msg 1: addr 0x51, read, len 8 Continue? [y/N] y 0x01 0x00 0x00 0x01 0x0e 0x1c 0x00 0xd4 Questions : 1. How the function isDevice16Bit Validated for 16 bit device ? 2. Is my validation and analysis is correct ? Could you please provide your suggestions on this. Thanks, Kumar. ::DISCLAIMER:: ________________________________ The contents of this e-mail and any attachment(s) are confidential and inte= nded for the named recipient(s) only. E-mail transmission is not guaranteed= to be secure or error-free as information could be intercepted, corrupted,= lost, destroyed, arrive late or incomplete, or may contain viruses in tran= smission. The e mail and its contents (with or without referred errors) sha= ll therefore not attach any liability on the originator or HCL or its affil= iates. Views or opinions, if any, presented in this email are solely those = of the author and may not necessarily reflect the views or opinions of HCL = or its affiliates. Any form of reproduction, dissemination, copying, disclo= sure, modification, distribution and / or publication of this message witho= ut the prior written consent of authorized representative of HCL is strictl= y prohibited. If you have received this email in error please delete it and= notify the sender immediately. Before opening any email and/or attachments= , please check them for viruses and other defects. ________________________________ --_000_PS2PR04MB3589B9346947C693802AE1F7FDA99PS2PR04MB3589apcp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Classification: Confidential

Hi All,

 

        &nbs= p;  We are working in FRU module that has 16 bit EEPROM and Wanted to = read eeprom data Via i2c.

        &nbs= p;  The below function in FruDevice.cpp in entity-manager validates 8b= it or 16 bit device.

        &nbs= p; 

        &nbs= p;  This function returns “0” for 8 bit device.<= /o:p>

 

        &nbs= p;  This function returns “0” for 16 bit device also. But = it’s supposed to return “1” for 16 bit device.=

 

        &nbs= p;  We have tested with our 16bit device. It returns “0” o= nly.

        &nbs= p; 

        &nbs= p;  If we read via i2c utility commands,  getting all 255 da= ta in the first bytes.

        &nbs= p;

        &nbs= p;  If we make code changes to return “1” for 16 bit = device and called the function “i2cSmbusWriteThenRead”,

        &nbs= p;  then we could able to read all the data perfectly for 16 bit = device.

 

        &nbs= p;  Code snippet :       <= /b>

 

        &nbs= p;   static int isDevice16Bit(int file)

        &nbs= p;       {

        &nbs= p;           /* Get first byte= */

        &nbs= p;           int byte1 =3D i2c= _smbus_read_byte_data(file, 0);

        &nbs= p;           if (byte1 < 0)=

        &nbs= p;           {

        &nbs= p;             =   return byte1;

        &nbs= p;           }

        &nbs= p;           /* Read 7 more by= tes, it will read same first byte in case of

        &nbs= p;            * 8 bit but= it will read next byte in case of 16 bit

        &nbs= p;            */

        &nbs= p;           for (int i =3D 0;= i < 7; i++)

        &nbs= p;           {

        &nbs= p;             =   int byte2 =3D i2c_smbus_read_byte_data(file, 0);

        &nbs= p;             =   if (byte2 < 0)

        &nbs= p;             =   {

        &nbs= p;             =       return byte2;

        &nbs= p;             =   }

        &nbs= p;             =   if (byte2 !=3D byte1)

        &nbs= p;             =   {

        &nbs= p;             =       return 1;

        &nbs= p;             =   }

        &nbs= p;           }

        &nbs= p;           return 0;

        &nbs= p;       }

 

    I2c utility command log :=

 

    i2ctransfer 12 w2@0x51 0x00 0x00 = r8 

   WARNING! This program can confuse = your I2C bus, cause data loss and worse!

   I will send the following messages to d= evice file /dev/i2c-12:

   msg 0: addr 0x51, write, len 2, buf 0x0= 0 0x00

   msg 1: addr 0x51, read, len 8

   Continue? [y/N] y

   0x01 0x00 0x00 0x01 0x0e 0x1c 0x00 0xd4=

 

    Questions :

1.       How the function isDevice16Bit Validated for 16 bit= device ?

2.       Is my validation and analysis is correct ?

 

     Could you please provide yo= ur suggestions on this.

 

Thanks,

Kumar.

 

 

 

 

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