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Use uboot to probe an I2C bus and act differently if there is or isn't a device there

Nick Wernicke
Intellectual 775 points

I would like to use uboot to probe the I2C bus and record the existence of a device.  If the device is there, I would like to change some boot parameters.

The command I would like to run is something like
if i2c probe = 5C; then setenv otherbootargs 'do stuff if device'; else setenv otherbootargs 'do stuff if no device'; fi

But this obviously won't work.  I don't know how to make uboot evaluate the conditional 'if' statement based on the return value of the i2c probe command.  Is this even possible? How might I make it work?

  • 0
    TI__Guru 65405 points

    Hi Nick,

    It is possible to use "i2c probe" command in if statement in the u-boot. I'll offer you one working example which could be executed in the u-boot prompt:

    if i2c probe = 4A;  then setenv bootdelay '20'; else setenv bootdelay '5'; fi

    Let me know if this example solve your issue.

    BR

    Tsvetolin Shulev