How-to enable HAB in i.MX6x

[#1]

Share my test procedure in the attachment.

[fsquestion]

I do not see a /sys/fsl_otp ???

I have defined "CONFIG_FSL_OTP" and re-compiled.  What step am I missing?

Edit:

(Sorry I mistakenly put /dev/fsl_otp)

[CarlChien]

Why do you look for this (/dev/fsl_otp)??

From my document, we just need /sys/fsl_otp.

[fsquestion]

Sorry...thank you.

I am not sure why the device doesn't show up in /sys/fsl_otp.  I selected "y" in menuconfig (.config), and recompiled.

[MickeyI]

I had the same issue. In my case I moved fsl_otp to be a module so it's error message could be read conveniently. The error I saw in dmesg after modprobing the fsl_otp module was this:

Error: Driver 'imx-ocotp' is already registered, aborting...

If you grep for imx-ocotp  on the kernel source you should find two instances:

./drivers/char/fsl_otp.c:241:           .name   = "imx-ocotp",

./arch/arm/plat-mxc/devices/platform-imx-ocotp.c:99:    return imx_add_platform_device("imx-ocotp", 0,

The second instance is in a function named imx_add_otp(), which has a wrapping #define, imx6q_add_otp() in case of the i.MX6.

I put a call for this function where the call for other components are made (imx6q_add_*) inside arch/arm/mach-mx6/board-mx6q_arm2.c (you may use a different board-mx6q_ file, depending on the hardware you use).

This fixed the issue, now fsl_otp runs and opens the /sys/fsl_otp dir.

[fsquestion]

Thank you Mickey!  This helped tremendously.