bugGNU GRUB - Bugs: bug #42026, error serial port `portf0e0' isn't...


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bug #42026: error serial port `portf0e0' isn't found

Submitted by:  Dave Chiluk <chiluk>
Submitted on:  Wed 02 Apr 2014 05:25:29 AM UTC  
Category:  Terminal Severity:  Major
Priority:  5 - Normal Item Group:  Software Error
Status:  None Privacy:  Public
Assigned to:  None Originator Name:  chiluk
Open/Closed:  Open Release: 
Release:  2.02~beta1 Reproducibility:  Every Time
Planned Release:  2.03+

( Jump to the original submission)

Tue 19 Dec 2017 08:28:57 AM UTC, comment #8:

I am hitting the same problem myself.

Commenting out SR checks results in a hang.

SR value before and after grub_outb calls is 0x00ff.

Andrzej Szeszo <aszeszo>
Mon 06 Mar 2017 07:36:06 PM UTC, comment #7:

Can you try commenting out the SR check in term/ns8250.c around line 300?

Vladimir Serbinenko <phcoder>
Project Administrator
Sun 17 Aug 2014 03:07:58 PM UTC, comment #6:

I am having the same issue on Gentoo using GRUB 2.02~beta2. SOL works just fine in Linux but GRUB refuses to use the port. This is a fairly new machine with a new installation (2 months give or take) and it has never had an older GRUB version installed.

I also double checked that the fix from 0eb8ffb1f579d4507d78a822c843e334417f9ba1 is indeed present in the source code.

David Holm <dholm>
Thu 03 Apr 2014 01:28:16 AM UTC, comment #5:

Hmm well that commit is definitely in our sources. I also checked with Colin Watson, and they are definitely built from the same sources.

Any other ideas?

Dave Chiluk <chiluk>
Wed 02 Apr 2014 09:08:09 PM UTC, comment #4:

0eb8ffb1f579d4507d78a822c843e334417f9ba1 is the fix. I think that your GRUB EFI version isn't the same grub-pc version.

Vladimir Serbinenko <phcoder>
Project Administrator
Wed 02 Apr 2014 08:01:47 PM UTC, comment #3:

Can you please provide a commit id? As I stated earlier the only difference between the grub2 grub-core/term/serial.c in ubuntu trusty and mainline is 9afe2053c9b which doesn't look like it fixes this issue.

again I'm running 2.2~beta2-8.

Dave Chiluk <chiluk>
Wed 02 Apr 2014 03:59:57 PM UTC, comment #2:

This is already fixed bug in trunk. My guess is that you use too old version.

Vladimir Serbinenko <phcoder>
Project Administrator
Wed 02 Apr 2014 06:27:28 AM UTC, comment #1:

So I went ahead and installed grub in legacy, non-efi mode, and that works with the identical settings.

I really hope this isn't an efi limitation. Please let me know if I can be of any assistance.

Dave Chiluk <chiluk>
Wed 02 Apr 2014 05:25:29 AM UTC, original submission:

I was attempting to configure my AMT enabled intel nuc, and grub cannot find the Serial over lan port.

Using 2.02~beta2-8 as currently found in Ubuntu Trusty, grub2 fails to find Intel AMT serial console.

grub> serial --port=0xf0e0 --speed 115200
error: serial port `portf0e0' isn't found

I checked and 9afe2053c9b was the only difference in grub-core/term/serial.c compared to the version available for trusty.

It might matter, but this machine is booting via uefi.

Also this might also be useful information.
$ grep ttyS4 /var/log/kern.log
Mar 31 21:53:37 nuc1 kernel: [ 0.691087] 0000:00:16.3: ttyS4 at I/O 0xf0e0 (irq = 19, base_baud = 115200) is a 16550A

SOL works fine once I get passed grub.

Dave Chiluk <chiluk>


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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2017-03-06 phcoder Planned Release2.02 => 2.03+
    2016-03-02 phcoder Planned ReleaseNone => 2.02
    2014-04-02 chiluk Carbon-Copy- => Added chiluk

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