Re: [Xen-devel] Xen on Arndale with SSD

[David Park <beastworld@xxxxxxxxx>]

2013/4/22 Julien Grall <julien.grall@xxxxxxxxxx>
>
> On 04/19/2013 10:11 AM, Sander Bogaert wrote:
>
> > Hi,
> >
> > I was wondering if anyone managed to use an ssd in this setup yet? I
> > gave it a try:
> >
> > - Julien's xen / dom0 / domU branches
> > - Comay Venus 3S SSD drive
> > - Changed the dts compiled in Xen to have root=/dev/sda1 for dom0
> > kernel parameter.
> > - The bootloader is on the SD card, the kernel and xen are loaded
> > using PXE, the dom0 rootfs is on the ssd disk.
> >
> > Xen hangs on (complete log attached):
> > (XEN) 3... 2... 1...
> > (XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
> > input to Xen)
> > (XEN) Freed 204kB init memory.
>
>
> I think linux hangs before hvc console is initialized. Could you try
> to apply this hackish patch and resent the log? This patch will directly
> call the console hypercall instead of buffering messages.
>
> diff --git a/kernel/printk.c b/kernel/printk.c
> index abbdd9e..6975215 100644
> --- a/kernel/printk.c
> +++ b/kernel/printk.c
> @@ -1652,6 +1652,8 @@ asmlinkage int printk_emit(int facility, int level,
>  }
>  EXPORT_SYMBOL(printk_emit);
>
> +void xen_raw_console_write(const char *buf);
> +
>  /**
>   * printk - print a kernel message
>   * @fmt: format string
> @@ -1677,6 +1679,7 @@ asmlinkage int printk(const char *fmt, ...)
>  {
>         va_list args;
>         int r;
> +       static char buf[512];
>
>  #ifdef CONFIG_KGDB_KDB
>         if (unlikely(kdb_trap_printk)) {
> @@ -1687,9 +1690,12 @@ asmlinkage int printk(const char *fmt, ...)
>         }
>  #endif
>         va_start(args, fmt);
> -       r = vprintk_emit(0, -1, NULL, 0, fmt, args);
> +//     r = vprintk_emit(0, -1, NULL, 0, fmt, args);
> +       r = vsnprintf(buf, sizeof(buf), fmt, args);
>         va_end(args);
>
> +       xen_raw_console_write(buf);
> +
>         return r;
>  }
>  EXPORT_SYMBOL(printk);
>
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>



 Hello,

 I hope following would be helpful to you.

 In my case, I'm currently using Runcore and Comay Venus SSD  in dom0
 I had a same problem when I use the Comay SSD before. (not on Runcore)
 But after updating the u-boot with latest one, I can use this well.
   (u-boot-linaro-stable, v2013.04-rc1)

 I recommend you to update the u-boot.

 Thanks,
 David

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