Sorry for the ripple... :-(
It is working now...
>
> menuentry 'Ubuntu GNU/Linux, with Xen (credit) and Linux
> 3.8.0-44-generic' --class ubuntu --class gnu-linux --class gnu --class
> os --class xen {
>
> savedefault
>
> insmod part_msdos
>
> insmod ext2
>
> set root='(hd0,msdos5)'
>
> search --no-floppy --fs-uuid --set=root
> 6c02f0b9-a3b4-4474-a0ab-807f019fd77e
>
> echo 'Loading Xen ...'
>
> multiboot /boot/xen-4.6-unstable.gz placeholder
> dom0_mem=8192M,max:8192M dom0_max_vcpus=8 sched=credit
> com5=115200,8n1,0xf010,50 console=com5,vga
I forgot to set up the "com1" in the xen image grub entry.
After setting the com1, the serial port works now~
>
> echo 'Loading Linux 3.8.0-44-generic ...'
>
> module /boot/vmlinuz-3.8.0-44-generic placeholder root=/dev/sda5
> ro panic=10 panic_on_oops=1 console=hvc0,115200n8 earlyprintk=xen
> quiet splash
>
> echo 'Loading initial ramdisk ...'
>
> module /boot/initrd.img-3.8.0-44-generic
>
> }
>
>
Finally, I pulled my leg from the serial port configuration mud...
Meng
-----------
Meng Xu
PhD Student in Computer and Information Science
University of Pennsylvania
http://www.cis.upenn.edu/~mengxu/
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