AT driver is not modified (debugging only);

TTY: select and revive with new notify and FS call back;
kernel: removed old notify code; removed ugly prepare_shutdown timer
kputc: don't send to FS if PRINTF_PROC fails

kernel/ipc.h

@@ -17,11 +17,9 @@
 #define SEND		 1	/* 0 0 0 1 : blocking send */
 #define RECEIVE		 2	/* 0 0 1 0 : blocking receive */
 #define SENDREC	 	 3  	/* 0 0 1 1 : SEND + RECEIVE */
-#define ALERT		 4	/* 0 1 0 0 : nonblocking notify */
+#define NOTIFY		 4	/* 0 1 0 0 : nonblocking notify */
 #define ECHO		 8	/* 1 0 0 0 : echo a message */
 
-#define NOTIFY		 16   /* 1 0 0 0 0 : temp */
-
 /* The following bit masks determine what checks that should be done. */
 #define CHECK_PTR     0x0B      /* 1 0 1 1 : validate message buffer */
 #define CHECK_DST     0x05	/* 0 1 0 1 : validate message destination */