busybox-1.1.3-watchdog_reboot.patch:

This patch will enable systems to reboot which can't reboot in the "normal" way.
It uses the system watchdog timer with a minimal timeout of 1 sec to cause a reboot.
The normal shutdown process is not influenced by it.

Author: Tobias Simon <address@hidden>

diff --exclude CVS -uNr busybox-1.1.3/init/Config.in busybox-1.1.3.modified/init/Config.in
--- busybox-1.1.3/init/Config.in	2006-03-22 22:16:25.000000000 +0100
+++ busybox-1.1.3.modified/init/Config.in	2007-01-08 11:43:00.000000000 +0100
@@ -65,6 +65,14 @@
 	help
 	  Stop all processes and either halt, reboot, or power off the system.
 
+config CONFIG_WATCHDOG_REBOOT
+   bool "watchdog timer reboot"
+   depends on CONFIG_HALT
+   default n
+   help
+      Thix fix enables rebooting systems for which the normal reboot does not work
+      using the watchdog timer in /dev/misc/watchdog.
+
 config CONFIG_MESG
 	bool "mesg"
 	default y
diff --exclude CVS -uNr busybox-1.1.3/init/init.c busybox-1.1.3.modified/init/init.c
--- busybox-1.1.3/init/init.c	2006-03-22 22:16:25.000000000 +0100
+++ busybox-1.1.3.modified/init/init.c	2007-01-08 11:45:02.000000000 +0100
@@ -29,8 +29,15 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <sys/reboot.h>
+
 #include "busybox.h"
 
+#ifdef CONFIG_WATCHDOG_REBOOT
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#endif /* CONFIG_WATCHDOG_REBOOT */
+
+
 #include "init_shared.h"
 
 
@@ -647,6 +654,20 @@
 	 * linux/kernel/sys.c, which can cause the machine to panic when
 	 * the init process is killed.... */
 	if ((pid = fork()) == 0) {
+#ifdef CONFIG_WATCHDOG_REBOOT
+      if (magic == RB_AUTOBOOT) {
+         int fd = open("/dev/misc/watchdog", O_WRONLY);
+         if (fd < 0) {
+            message(CONSOLE | LOG, "could not reboot: please enable watchdog support in the kernel.");
+         } 
+         else {
+            /* reboot in a second: */
+            unsigned long timeout = 1;
+            ioctl(fd, WDIOC_SETTIMEOUT, &timeout);
+            close(fd);
+         }
+      }
+#endif /* CONFIG_WATCHDOG_REBOOT */
 		reboot(magic);
 		_exit(0);
 	}