XO-1.75/Kernel/FIQ
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Change /etc/init/ttySx.conf
Change /dev/ttyS2 to /dev/ttyFIQ0 two times in this file.
sed --in-place 's/ttyS2/ttyFIQ0/g' /etc/init/ttySx.conf
Corrects missing serial console shell.
Disable watchdog
The watchdog is normally not enabled. If it is, and a hang occurs, and the FIQ debugger is entered, only a short time is available for interaction before the watchdog restarts the CPU. If you have enabled the watchdog, disabling by removing the empty marker file:
rm /runin/watchdog