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Kernel reboot issue of dm8168 base on DVRRDK_01.09.00.16

Hi,

We use DM8168 and base on DVRRDK_01.09.00.16.  We use the cmdline:

mem=254M console=ttyO0,115200n8 root=/dev/mtdblock5 rw rootfstype=jffs2 init=/linuxrc ip=off vram=20M notifyk.vpssm3_sva=0xBFD00000 rootdelay=1.

But we found if we use "reboot" under shell some time the kernel will block at: 

init/main.c ==> kernel_init() == >

        /* Open the /dev/console on the rootfs, this should never fail */
        if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
                printk(KERN_WARNING "Warning: unable to open an initial console.\n");

Any one known this issue? How to fix it?

Thanks.