ttyS0: LSR safety check engaged!

ttyS0: LSR safety check engaged!

[kyle.ma83]

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Hi everyone

When I use xen-3.2.0 and linux-2.6.18 domian0 and debug xen with gdb stub, I failed.

dmesg |grep tty always get :

serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
00:06: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
ttyS0: LSR safety check engaged!
ttyS0: LSR safety check engaged!
ttyS0: LSR safety check engaged!
ttyS0: LSR safety check engaged!

my grub is :

kernel          /boot/xen-3.2.0.gz hap com1=115200,8n1 console=com1H gdb=com1L
module          /boot/vmlinuz-2.6.18.8-xen root=/dev/sda1 ro xencons=off
module          /boot/initrd.img-2.6.18.8-xen

I use a DELL PowerEdge server with Intel cpu, I don't what is the reason. when I use the same server and boot linux kernel , and no problem .

In grub I change many times with xencons=off or with nothing etc. but the problem is the same ttyS0: LSR safety check engaged!

Could anyone help me on this?  I really appreciate much.
2009-09-02 



kyle.ma83 

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Re: ttyS0: LSR safety check engaged!

[Keir Fraser]

On 02/09/2009 10:00, "kyle.ma83" <kyle.ma83@gmail.com> wrote:

> my grub is :
>  
> kernel          /boot/xen-3.2.0.gz hap com1=115200,8n1 console=com1H gdb=com1L
> module          /boot/vmlinuz-2.6.18.8-xen root=/dev/sda1 ro xencons=off
> module          /boot/initrd.img-2.6.18.8-xen
>  
> I use a DELL PowerEdge server with Intel cpu, I don't what is the reason. when
> I use the same server and boot linux kernel , and no problem .
>  
> In grub I change many times with xencons=off or with nothing etc. but the
> problem is the same ttyS0: LSR safety check engaged!
>  
> Could anyone help me on this?  I really appreciate much.

You may need to configure ttyS0 (COM1) on Xen's command line. For example,
com1=115200,8n1

That will set Xen up on that serial line at the correct baud rate etc, and
also prevent dom0 kernel from using it.

 -- Keir