10 Sep
2012
10 Sep
'12
11:16 a.m.
serial port, the CPU receives NMI exception, and we fall into KDB shell. So, it is our "debug console", and it is able to interrupt (and thus debug) even IRQ handlers themselves.
You seem to have an assumption of single core here. What happens if the NMI hits CPU #0 and the serial IRQ hits CPU #1 simultaneously ?
Alan