i386/pc386 interrupt and remote debug stub improvements.

Chris Johns chrisj at rtems.org
Fri May 6 22:23:44 UTC 2016

These patches improve the ATPIC handling removing the spurious interrupt
from PIC devices connected to the slave PIC.

The GDB stub now supports x86 debug registers so hardware break and
access point support works in gdb.

Add an IDE disable boot command line option.

Fix printk support on serial ports.

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