Facing issue while fusing the SOM

[balasubramaniyam]

Hi,

I'm using i.MX6 SOLO SOM. And I'm trying to fuse the SOM by using the below command.

CFG4: (eMMC fuse)
echo 0x4060 > /sys/fsl_otp/HW_OCOTP_CFG4

CFG5: (BT_FUSE_SEL)

echo 0x10 > /sys/fsl_otp/HW_OCOTP_CFG5

When I fused CFG4 and read I get the same value which I was written. But when I fuse the CFG5 and read I get the wrong value.

$ echo 0x10 > /sys/fsl_otp/HW_OCOTP_CFG5

$ cat  /sys/fsl_otp/HW_OCOTP_CFG5

0x1

These issue only occurs in 10 out of 100 SOM in a same slot.

Hoping for better guidance.

Thanks and Regards,

Bala

[igorpadykov]

Hi Bala

issue may be caused by incorrect power-up sequence, one can recheck it using

datasheet and hardware user guide

i.MX 6Solo/6DualLite Applications Processors for Consumer Products

IMX6DQ6SDLHDG, Hardware Development Guide for i.MX 6Quad, 6Dual, 6DualLite, 6Solo Families of Applic...

also one can try to program fuse in uboot https://community.nxp.com/docs/DOC-95458 

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------