BOOT_CHAIN_0/1/SEL question

Robotics & Edge Computing Jetson Systems Jetson Thor
1

We are designing a board based on Thor and would like to ask about the actual usage of the following pins in the developer kit:

I2S2_CLK/BOOT_CHAIN_1
GPIO56/BOOT_CHAIN_SEL
GPIO39/BOOT_CHAIN_0

I see that the Pinmux table is set as a simple GPIO. What is its actual function?

If our board doesn’t use it, can we set it to floating? (The Pinmux table will also be set to unused)

or is there any suggestion about these pin?

thanks!

3

Hi willy.hsu,

From the pinmux spreadsheet as following, all of these 3 pins are configured as GPIO/Input by default.
image
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You can simply use them as the input pin w/o any changes or you can configure them as unused_xxxx if you don’t need to use them.

4

Hi Kevin,

Thank you for your reply.

However, we would still like to ask about the function of the BOOT_CHAIN signals on the developer kit.
Could you please share some information about them?

Thank you.

5

They are just the naming which may be used for other platform, please ignore them.
From the drop-down option, this pin can be use either as GPIO or I2S2_SCLK as following.

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