最近发现STlinux系统无法reboot，执行了如下几个命令都是一样的结果

root@wtCAB7167jffs2 :~# reboot
INIT: Switching to runlevel: 6
root@xxha:~#
Broadcast message from root (console) (Sat Jan  1 00:09:00 2000):

The system is going down for reboot NOW!
INIT: Sending processes the TERM signal
INIT: Sending processes the KILL signal
Stopping portmap daemon: portmap.
Stopping sshd:ok
Saving random seed...done.
Stopping xinetd: ok
Stopping kernel log daemon: klogd.
not deconfiguring network interfaces: network file systems still mounted.
Stopping system log daemon: syslogd.
Stopping kernel event manager...
Sending all processes the TERM signal...done.
Sending all processes the KILL signal...done.
Unmounting remote and non-toplevel virtual filesystems...done.
Deactivating swap...umount: invalid option -- t
done.
Unmounting local filesystems...umount: invalid option -- t
done.
Rebooting... Restarting

root@xxha :~# init 6
INIT: Switching to runlevel: 6
INIT: Sending processes the TERM signal
INIT: Sending processes the KILL signal
Stopping portmap daemon: portmap.
Stopping sshd:ok
Saving random seed...done.
Stopping xinetd: ok
Stopping kernel log daemon: klogd.
not deconfiguring network interfaces: network file systems still mounted.
Stopping system log daemon: syslogd.
Stopping kernel event manager...
Sending all processes the TERM signal...done.
Sending all processes the KILL signal...done.
Unmounting remote and non-toplevel virtual filesystems...done.
Deactivating swap...umount: invalid option -- t
done.
Unmounting local filesystems...umount: invalid option -- t
done.
Rebooting... Restarting

root@xxha :~# shutdown -r now
INIT: Switching to runlevel: 6
root@xxha:~#
Broadcast message from root (console) (Sat Jan  1 00:06:13 2000):

The system is going down for reboot NOW!
INIT: Sending processes the TERM signal
INIT: Sending processes the KILL signal
Stopping portmap daemon: portmap.
Stopping sshd:ok
Saving random seed...done.
Stopping xinetd: ok
Stopping kernel log daemon: klogd.
not deconfiguring network interfaces: network file systems still mounted.
Stopping system log daemon: syslogd.
Stopping kernel event manager...
Sending all processes the TERM signal...done.
Sending all processes the KILL signal...done.
Unmounting remote and non-toplevel virtual filesystems...done.
Deactivating swap...umount: invalid option -- t
done.
Unmounting local filesystems...umount: invalid option -- t
done.
Rebooting... Restarting

root@xxha :~# reboot -f
Restarting

分析，应该是kernel和uboot出了问题。

在uboot里执行reset，也没重起反应，说明uboot的重起也有问题。

后来联系了支持，得到几个补丁。打上后，果然就好了。

补丁如下：

1.内核部分，有2个patch：

[root@localhost kernel]# cat linux-sh4-2.6.23.17_stm23_0122-7105machine_restart-kernel122.patch
--- linux-sh4-2.6.23.17_stm23_0122/ arch/sh/kernel/process.c     2009-08-28 13:07:14.000000000 +0100
+++ linux-sh4-2.6.23.17_stm23_0122new/arch/sh/kernel/process.c  2009-09-29 13:41:35.000000000 +0100
@@ -26,6 +26,7 @@
 #include <asm/system.h>
 #include <asm/ubc.h>
 #include <asm/watchdog.h>
+#include <linux/stm/sysconf.h>
 
 static int hlt_counter;
 int ubc_usercnt = 0;
@@ -106,10 +107,20 @@ static void watchdog_trigger_immediate(v
 
 void machine_restart(char *__unused)
 {
-       /* Use watchdog timer to trigger reset */
-       local_irq_disable();
-       watchdog_trigger_immediate();
-       while (1) {};
+   struct sysconf_field *sc1;
+   struct sysconf_field *sc2;
+        /* Use watchdog timer to trigger reset */
+        local_irq_disable();
+        /* ensure the reset period is short and that the reset is */
+        /* not masked */
+        if (! (sc1 = sysconf_claim (SYS_CFG, 9, 29, 29, "kernel")))
+           printk (KERN_EMERG "Cant claim sysconf9\n");
+        if (! (sc2 = sysconf_claim (SYS_CFG, 9, 0, 25, "kernel")))
+           printk (KERN_EMERG "Cant claim sysconf9\n");
+        sysconf_write (sc1, 0x0);
+        sysconf_write (sc2, 0x00000a8c);
+        watchdog_trigger_immediate();
+        while (1) {};
 }
 
 void machine_halt(void)
[root@localhost kernel]#

[ root@localhost kernel]# cat linux-sh4-2.6.23.17_stm23_0122-pdk7105setup.patch
--- linux-sh4-2.6.23.17_stm23_0122 /arch/sh/boards/st/pdk7105/setup.c    2009-08-28 13:07:14.000000000 +0100
+++ linux-sh4-2.6.23.17_stm23_0122-new/arch/sh/boards/st/pdk7105/setup.c        2009-09-29 13:44:53.000000000 +0100
@@ -313,6 +313,12 @@ static int __init device_init(void)
        struct sysconf_field *sc;
        u32 boot_mode;
 
+        /* Get the reset chain correct to start with */
+        sc = sysconf_claim(SYS_CFG, 9, 27, 28, "reset_chain");
+        sysconf_write(sc, 0);
+        /* release the sysconf bits so the coprocessor driver can claim them*/
+        sysconf_release (sc);
+
        bank1_start = emi_bank_base(1);
        bank2_start = emi_bank_base(2);
 
[root@localhost kernel]#

2.uboot部分内核：

把 pdk7105.romgen 拷贝到
[root@localhost u-boot-sh4-1.3.1_stm23_0046]# cp -f pdk7105.romgen board/st/pdk7105/pdk7105.romgen

[root@localhost kernel]# cat u-boot_0042_reset_7105.patch
--- u-boot-sh4-1.3.1_stm23_0042/cpu/sh/stx7105/stx7105.c        2008-10-15 00:09:42.000000000 +0100
+++ u-boot-sh4-1.3.1_stm23_0042-mb680/cpu/sh/stx7105/stx7105.c  2009-03-23 13:47:15.000000000 +0000
@@ -181,10 +181,9 @@ int soc_init(void)
 
        bd->bi_devid = *STX7105_SYSCONF_DEVICEID_0;
 
-#if QQQ        /* QQQ - TO FIX */
-       /*  Make sure reset period is shorter than WDT timeout */
-       *STX7105_SYSCONF_SYS_CFG09 = (*STX7105_SYSCONF_SYS_CFG09 & 0xFF000000) | 0x000A8C;
-#endif /* QQQ - TO FIX */
+       /*  Make sure reset period is shorter than WDT timeout and that */
+        /*  the reset is not bypassed                                   */
+       *STX7105_SYSCONF_SYS_CFG09 = (*STX7105_SYSCONF_SYS_CFG09 & 0xF7000000) | 0x000A8C;
 
        return 0;
 }
[root@localhost kernel]#

打完上述4个补丁，重新编译u-boot，kernel，烧写进nandflash，启动，就可以reboot成功了~，u-boot也可以成功reset了~