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Re: Grub2 UEFI boot and serial console output

From: Matwey V. Kornilov
Subject: Re: Grub2 UEFI boot and serial console output
Date: Mon, 16 Jan 2017 12:25:29 +0300

2017-01-16 12:22 GMT+03:00 Andrei Borzenkov <address@hidden>:
> On Mon, Jan 16, 2017 at 11:36 AM, Matwey V. Kornilov
> <address@hidden> wrote:
>>> I think here is my issue:
>>> terminal_input says that 'console' is active terminal and no other
>>> terminals available.
>>> serial --speed=115200 efi0 says "can't find command `serial'"
>> Ok, now I see! There is file /boot/grub2/x86_64-efi/serial.mod but
>> isnmod serial says that there is no such file.
> Well
> 1. $prefix must be set correctly (normally is done for you by
> grub-install & Co.; I do not know how you created your image)
> 2. Device which is part of $prefix must of course exist. You may need
> to explicitly load partition driver (not autoloaded) and/or virtual
> storage drivers (Linux MD, LVM2, LUKS, etc)
> 3. You need filesystem driver for this device (normally autoloaded).
> 4. Most vendors build images for use with Secure Boot that disable
> module load. Unless module is included in the image by vendor, it is
> flat unavailable. If you are using such image (you most likely do if
> you enabled secure boot support in your OS configuration) - check how
> image is built. You are using openSUSE, are not you?

Thank you. Yes, I am using openSUSE. And there is Secure Boot... All
this has been made by default installer.

> All of this is basic stuff and has nothing to do with your problem
> with serial port.

Now it is clear of course.

With best regards,
Matwey V. Kornilov

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