Tamper Pin Disable in i.MX6UL G3

[vineethhegde]

Hi,

 We are using imx6ul G3 in our of our custom design. We want to configure TAMPER_PIN 9 as GPIO but we are unable to do so.

We tried to set the SW_MUX_CTL_PAD_SNVS_TAMPER9 SW MUX Control Register (0x020E0040) to value 0x5 but when we read back its showing as 0. We tried the same with all the other TAMPER pins(0-9) as well. Also, when we read the fuse register(0x430, TAMPER_PIN_DISABLE[1:0]), its giving value as 0xf0216801 ( Which means TAMPER_PIN_DISABLE[1:0] is set to 0x2(10)).

Please let us know how to configure Tamper Pin as GPIO’s .

Regards,

vineeth

[ManotSwasdee]

The TAMPER_DISABLE_PIN[1:0] = 2 means the Tamper pins 2, 3, 4, 7, 8, 9 are configured to function as the tamper pins so you cannot use them as GPIO pins. 

[Yuri]

Hello,

  Tamper pins can function as GPIO, depending on TAMPER_PIN_DISABLE[1:0] fuse settings.

Say, for the i.MX6UL G2,  the fuses TAMPER_PIN_DISABLE[1:0] = 11, meaning TAMPER0-9 used as GPIO.

mx6ul tamper pin to gpio  

 But in i.MX6UL G3 release the tamper pins cannot be used as GPIO.

Can't disable tamper pins on imx6ul G3 

Have a great day,

Yuri

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