e-Fuses in i.MX6 SOLO

[Arm7]

Hello,

I am using an i.MX6 SOLO, in the chapter 5 Fusemap. there are two fuses:

GP1 and GP2. Can I use them for my personal purpose?

My purpose:

I want to write a "bit(s)" and then read it later.

if possible: 

• What impact will it have on the i.MX (performance, functionality...) ?

if NOT:

• Is there an "fuse" for my purpose ? Which one ?

I would appreciate your help.

Thank you!

[JosephAtNXP]

Hi,

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.

These fuses can be used personally as asked, you can write bits but look at the particular way of writing to them in uboot under de command

=> fuse prog [-y] <bank> <word> <hexval>
Write directly in the fusebox
#NOTE: This operation is irreversible and can brick your device.

Also, for reading, you can do read them and for more information, refer to 47.3.1.2 Fuse and Shadow Register Read in 6 Solo Reference Manual.

Additionally, I found this article.

https://imxdev.gitlab.io/tutorial/Burning_eFuses_on_i.MX/

Thank you!

[Arm7]

Hello @JosephAtNXP 

Thank you! for your support!

Can I read a fuse before DDR3 initializes ? 

The idea is to read a fuse to make some adjustments to the RAM DDR3.

[JosephAtNXP · Accepted solution]

Hi,

I have not seen that use, the DDR initialization cannot met those results? If it's a tuning or configuration, I think that the output from a configuration and stress tool would do that.

I guess that you can read the registers with shadow registers but should happen at SPL due to it's when DDR is initialized

https://community.nxp.com/t5/i-MX-Processors/Shadow-Registers-Read-Write/td-p/488410 

Thank you