SPI_IOC_MESSAGE ioctl for SPI extremely slow

Robotics & Edge Computing Jetson Systems Jetson Orin Nano
11

I found the bug in jetson-io.py and implemented a workaround.

In the Jetson subdirectory, there’s another python source called board.py.

This bit of code here incorrectly computes the partition name to look for:

        #Finding the active partition in case of redundant rootfs flash.
        activepart = syscall.call_out('nvbootctrl get-current-slot')
        if activepart[0] == '0':
            mountpart = "APP"
        else:
            mountpart = "APP_b"

I hacked it to set mountpart to “APP”. That worked, and everything’s going again.

This QA snafu cost me a lot of time. You might want to write an app note somewhere to spare others this frustration.