Ian Dowse 11fbe665c0 The serial console break-to-debugger support only functioned while ... the console device was open. At other times, the interrupts that are used to detect the break signal or ~^B sequence were disabled, so these events would not be noticed until the next open (e.g. the next kernel printf). This was mainly a problem while there was no getty running on the console, such as during bootup or shutdown. For serial consoles with break-to-debugger support, we now enable the generation of interrupts at attach time, and we leave them enabled while the device is closed. Reviewed by: bde (I've since made chages as per his suggestions)		2001-06-20 16:47:23 +00:00
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sio.c	The serial console break-to-debugger support only functioned while	2001-06-20 16:47:23 +00:00
sioreg.h