From: Ben Gras <ben@minix3.org>
Date: Thu, 29 Jan 2009 15:06:40 +0000 (+0000)
Subject: If serial debugging in the boot monitor / kernel is enabled, don't touch
X-Git-Tag: v3.1.4~120
X-Git-Url: http://zhaoyanbai.com/repos/?a=commitdiff_plain;h=80f5eea8b80041c3a77fe94091282399c0ac9ff2;p=minix.git

If serial debugging in the boot monitor / kernel is enabled, don't touch
the serial line in use for it (mostly so that input isn't eaten by tty).
---

diff --git a/drivers/tty/rs232.c b/drivers/tty/rs232.c
index 8bc70599f..aed377b25 100644
--- a/drivers/tty/rs232.c
+++ b/drivers/tty/rs232.c
@@ -445,9 +445,19 @@ tty_t *tp;			/* which TTY */
   int line;
   port_t this_8250;
   int irq;
+  char l[10];
 
   /* Associate RS232 and TTY structures. */
   line = tp - &tty_table[NR_CONS];
+
+  /* See if kernel debugging is enabled; if so, don't initialize this
+   * serial line, making tty not look at the irq and returning ENXIO
+   * for all requests on it from userland. (The kernel will use it.)
+   */
+  if(env_get_param(SERVARNAME, l, sizeof(l)-1) == OK && atoi(l) == line) {
+     return;
+  }
+
   rs = tp->tty_priv = &rs_lines[line];
   rs->tty = tp;