As long as “
quiet” appears logging will be reduced. Boot stages prior to the Linux kernel loading may look at this via the device tree. Normally, if
extlinux.conf is present and specifies the option, then that is what is used, but there are also circumstances where a device tree might provide such options. Do you see “
quiet” from this command?
If you don’t see “
quiet” there, and don’t see quiet from “
cat /proc/cmdline”, then you have succeeded at removing the option and do not need to look further (so far as simple options go).
Most of the Jetsons run Cboot, which then loads U-Boot, but the Xavier and NX boot directly from CBoot. I suppose it is possible there is some other option for the non-U-Boot releases to not log during pre-Linux-kernel stages, but I am not aware of any such compiled in option.
Are all instances of “
quiet” removed? If you log boot via serial, is your first log line something like this:
Booting Linux on physical CPU
…or is there more content prior to that line? If the log begins with that line, then it is not logging prior to the Linux kernel. If there is more content prior to that line, then you’ve verified CBoot is doing at least some logging.