[Xen-devel] Question about Xen serial console on non-standard PCI serial ports

[Meng Xu <xumengpanda@xxxxxxxxx>]

Hi all,

We bought a new machine which has no legacy serial ports on the
motherboard. But we added two PCI serial ports onto the motherboard.

We are trying to configure Xen serial console on the non-standard PCI
serial port.
(We have successfully configure Xen serial console on the legacy
serial port before.)

We followed the manual on [1].
We connect the ttyS4 to the serial port of a remote machine.

The following command run on the host machine (the new machine I want
to configure).
***The "setserial -g /dev/ttyS*" shows:***
/dev/ttyS4, UART: 16650V2, Port: 0xf010, IRQ: 50
/dev/ttyS5, UART: 16650V2, Port: 0xf000, IRQ: 52

*** The PCI serial device is listed in "lspci -v" as below:***

81:00.0 Serial controller: MosChip Semiconductor Technology Ltd. PCIe
9922 Multi-I/O Controller (prog-if 02 [16550])

    Subsystem: Device a000:1000

    Flags: bus master, fast devsel, latency 0, IRQ 50

    I/O ports at f010 [size=8]

    Memory at fbe03000 (32-bit, non-prefetchable) [size=4K]

    Memory at fbe02000 (32-bit, non-prefetchable) [size=4K]

    Capabilities: [50] MSI: Enable- Count=1/8 Maskable- 64bit+

    Capabilities: [78] Power Management version 3

    Capabilities: [80] Express Legacy Endpoint, MSI 00

    Capabilities: [100] Virtual Channel

    Capabilities: [800] Advanced Error Reporting

    Kernel driver in use: serial

81:00.1 Serial controller: MosChip Semiconductor Technology Ltd. PCIe
9922 Multi-I/O Controller (prog-if 02 [16550])

    Subsystem: Device a000:1000

    Flags: bus master, fast devsel, latency 0, IRQ 52

    I/O ports at f000 [size=8]

    Memory at fbe01000 (32-bit, non-prefetchable) [size=4K]

    Memory at fbe00000 (32-bit, non-prefetchable) [size=4K]

    Capabilities: [50] MSI: Enable- Count=1/8 Maskable- 64bit+

    Capabilities: [78] Power Management version 3

    Capabilities: [80] Express Legacy Endpoint, MSI 00

    Capabilities: [100] Advanced Error Reporting

    Kernel driver in use: serial

*** The command line I used for xen image is***
dom0_mem=8192M,max:8192M dom0_max_vcpus=8 sched=credit
com5=115200,8n1,0xf010,50  console=com5,vga

***The command line I used for dom0 image is***
panic=10 panic_on_oops=1 console=hvc0,115200n8 earlyprintk=xen quiet splash


***The problem is***:
When I boot up the host machine into Xen and use "sudo screen
/dev/ttyS0 115200n8" on the remote machine to listen to the serial
port of the host machine, I can only see some garbled message.

***My question is***:
Is there anything else I should configure to use the non-standard PCI
serial port?
Is the non-standard PCI serial ports supported in current Xen version?
When Xen kernel crash, will the kernel dump information be directed to
the remote machine via the non-standard PCI serial port? (I know this
works on the legacy serial port but I'm not sure if it works for the
non-standard PCI serial port.)

Thank you very much for your help! Any suggestion is really appreciated!
If you need any further information, please let me know!
I attach the full grub entry information at the end of this email.

Best regards,

Meng

-------------------------------
The full grub entry I used is:

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

    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

}



[1] http://wiki.xenproject.org/wiki/Xen_Serial_Console



-- 


-----------
Meng Xu
PhD Student in Computer and Information Science
University of Pennsylvania
http://www.cis.upenn.edu/~mengxu/

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel