topic IMX6sx serial number and MAC address programming ? in i.MX Processors

IMX6sx serial number and MAC address programming ?

robinsingh — Wed, 21 Oct 2015 20:41:23 GMT

Hi All,

we are making a product based on imx6sx and i have to implement serial number and Ethernet mac address programming for manufacturing.

I have a few questions, can somebody help me with answer or some pointers:

1) Does the IMX6sx chipset come with a pre-programmed serial number ? or do i have to program it ?

I did not find anything for writing the serial number, so i guess it will be pre-programmed. is my understanding correct?

For reading I found the below function in u-boot at: arch/arm/cpu/armv7/mx6/soc.c

void get_board_serial(struct tag_serialnr *serialnr);

its reading the serial number and then appending it to the cmdline args for passing to kernel.

is this the only step required for reading or do i have to do any thing extra ?

2) Ethernet MAC address programming: I have a partition on my target /device [ size 8MB]

= /dev/block/mmcblk3p7, As per the Android user guide it says " To store MAC address files",

shall i use this for saving Ethernet MAC address or it is for wifi MAC address only

do i need to fuse the ethernet MAC address ? which approach is better ?

3) I saw a file in /dev/block/mmcblk3p7 partition "/device/wifi/softmac" ,

can i create a similar file for the Ethernet MAC address and read from it ?

Thanks in advance

Robin

igorpadykov — Thu, 22 Oct 2015 08:03:35 GMT

Hi robin

1. yes i.MX6SX comes with a preprogrammed serial number, one can look at

Unique ID Table 5-9. Fusemap Descriptions i.MX6SX Reference Manual (rev.0 2/2015)

Mac address can be programmed to fuses MAC1,2_ADDR.

2.3. android saves in partitions some vendor data like wifi MAC, seems Ethernet

MAC address also can be saved. For details one can post this on

Best regards

igor

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BiyongSUN — Thu, 22 Oct 2015 09:43:22 GMT

The drivers/char/fsl_otp.c populate node in /sys/fsl_otp as attribute

MAC0 and MAC1 are already there.

The serial number you need to add by yourself.