linux-2.6.29 s3c6410 reboot实现
S3C6410 BSP驱动默认并未实现reboot机制，reboot的底层驱动实现接口为arch_reset, 该函数在system.h中实现。
实现方式可参考UBOOT中的实现：
static inline void arch_wdt_reset(void){struct clk *wdtclk;printk("arch_reset: attempting watchdog reset\n");__raw_writel(0, S3C2410_WTCON); /* disable watchdog, to be safe */wdtclk = clk_get(NULL, "watchdog");if (!IS_ERR(wdtclk)) {clk_enable(wdtclk);} elseprintk(KERN_WARNING "%s: warning: cannot get watchdog clock\n", __func__);/* put initial values into count and data */__raw_writel(0x80, S3C2410_WTCNT);__raw_writel(0x80, S3C2410_WTDAT);/* set the watchdog to go and reset... */__raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON);/* wait for reset to assert... */mdelay(500);printk(KERN_ERR "Watchdog reset failed to assert reset\n");/* delay to allow the serial port to show the message */mdelay(50);