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

[Andrei Borzenkov]

В Wed, 08 Apr 2015 16:55:35 +0200
Jelle de Jong <address@hidden> пишет:

> 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
> 

That looks good. Do you use legacy BIOS or UEFI boot? Which
distribution? 

> 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"
> 
> > _______________________________________________
> > Help-grub mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/help-grub
> 
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