Re: grub serial console advice on pci, pci-e, usb serial adapters

[Jelle de Jong]

On 08/04/15 15:54, Andrei Borzenkov wrote:
> On Wed, Apr 8, 2015 at 3:52 PM, Jelle de Jong <address@hidden> wrote:
>>
>> So my question is, can I use an PCI or PCI-E serial adapter (specific
>> drivers?) to make sure the GRUB serial output is shown.
>>
> 
> grub supports standard ns8250 UART; it will probe for the first 4
> ports. As long as your PCI card is compatible and can be set to answer
> to one of first COM ports address, it has good chances to work.

I think I use a generic pci serial adaptor, how can I figure this out?

37:09.0 Serial controller [0700]: Titan Electronics Inc VScom 100L 1
port serial adaptor [14d2:8010]

# grep tty /var/log/dmesg
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.2.0-4-amd64
root=UUID=705b5c0f-4274-459f-ba16-60dc64d27eac ro console=ttyS0,115200 quiet
[    0.000000] Kernel command line:
BOOT_IMAGE=/boot/vmlinuz-3.2.0-4-amd64
root=UUID=705b5c0f-4274-459f-ba16-60dc64d27eac ro console=ttyS0,115200 quiet
[    0.000000] console [ttyS0] enabled
[    2.348085] 0000:37:09.0: ttyS0 at I/O 0xe008 (irq = 21) is a 16550A

http://en.wikipedia.org/wiki/16550_UART
http://en.wikipedia.org/wiki/8250_UART

"Both the computer hardware and software interface of the 16550 are
backward compatible with the earlier 8250 UART"

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