serial console patch for 2.0.33

Brian Rogers (w006552@airmail.net)
Sun, 15 Feb 1998 18:31:15 -0600

The below patch to 2.0.33 will allow a Linux box with no video card to boot
with /dev/ttyS0 (COM1) as the console. The files /dev/tty1 and
/dev/console should be deleted then made symbolic links to /dev/ttyS0. The
"serial=0,9600n8", "prompt", and "timeout=" options needs to be added to
/etc/lilo.conf. Note that, in the kernel source, the baud rate is
hard-coded to 9600 and the serial port to COM1 at address 0x3f8. (It was
that way when I found it.) You'll probably want to disable the getty on
tty1 and add a getty for ttyS0 at 9600 baud.

/* Brian Rogers */

diff -ur linux-2.0.33/arch/i386/config.in
linux-2.0.33-patched/arch/i386/config.in

---
linux-2.0.33/arch/i386/config.in	Sun May 12 23:17:23 1996
+++
linux-2.0.33-patched/arch/i386/config.in	Fri Feb  6 00:43:49 1998
@@ -43,6
+43,7 @@
 	 486		CONFIG_M486	\
 	 Pentium	CONFIG_M586	\
 	 PPro
CONFIG_M686" Pentium
+bool 'Echo console messages on /dev/ttyS0 (COM1)'
CONFIG_SERIAL_ECHO
 endmenu
 
 source drivers/block/Config.in
diff -ur
linux-2.0.33/drivers/char/console.c
linux-2.0.33-patched/drivers/char/console.c

---
linux-2.0.33/drivers/char/console.c	Mon Nov  3 18:56:30 1997
+++
linux-2.0.33-patched/drivers/char/console.c	Sun Feb  8 15:38:48 1998
@@
-1866,6 +1866,10 @@
 	unsigned char c;
 	static int printing = 0;
 
+#ifdef
CONFIG_SERIAL_ECHO
+        serial_echo_print(b);
+#endif /*
CONFIG_SERIAL_ECHO */
+
 	if (!printable || printing)
 		return;	 /*
console not yet initialized */
 	printing = 1;
@@ -1879,10 +1883,6 @@


return;
 	}
 
-#ifdef CONFIG_SERIAL_ECHO
-
serial_echo_print(b);
-#endif /* CONFIG_SERIAL_ECHO */
-
 	while ((c =
*(b++)) != 0) {
 		if (c == 10 || c == 13 || need_wrap) {
 			if (c !=
13)
@@ -2077,6 +2077,10 @@
 	set_origin(currcons);
 	csi_J(currcons, 0);




+#ifdef CONFIG_SERIAL_ECHO
+	serial_echo_init(SERIAL_ECHO_PORT);
+#endif
/* CONFIG_SERIAL_ECHO */
+
 	/* Figure out the size of the screen and
screen font so we
 	   can figure out the appropriate screen size should we
load
 	   a different font */
@@ -2088,10 +2092,6 @@
 		default_font_height
= video_font_height = ORIG_VIDEO_POINTS;
 		/* This may be suboptimal but
is a safe bet - go with it */
 		video_scan_lines = video_font_height *
video_num_lines;
-
-#ifdef CONFIG_SERIAL_ECHO
-
serial_echo_init(SERIAL_ECHO_PORT);
-#endif /* CONFIG_SERIAL_ECHO */
 


printk("Console: %ld point font, %ld scans\n",
 		       video_font_height,
video_scan_lines);






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