https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290295
Bug ID: 290295
Summary: aws ec2 freebsd 14 arm serial console gone
Product: Base System
Version: 14.3-STABLE
Hardware: arm64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: arm
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
I'm not sure what changed in aws around Sep or Oct 2025, I noticed that serial
console is gone on arm64 instances. As to amd64 instances, all works. I ran
more tests on various snapshots and found that in FreeBSD 15, the issue is
resolved after 5.0-PRERELEASE-arm64-20250822. Then I tested several kernel
builds by reverting commits one by one, and luckily found the one-line fix
https://cgit.freebsd.org/src/commit/?h=releng/15.0&id=a685a263b803012d9546abaca4dcf52f80c6b8d6
Although it's a one line patch, but for me it's not easy to apply it on
stable/14. Either find the equivalent bits in stable/14 and fix it, or apply
all the fundamental changes in stable/15 (uart, acpica, maybe pci as well) to
fix it.
Since 14.4 release is still months away, lwhsu@ recommended opening a
ticket here. I’m happy to test any potential fix.
Additional tests I did before submitting the ticket:
Up to table/14-n272680-258cde4b2e48
https://cgit.freebsd.org/src/commit/?h=stable/14&id=258cde4b2e4832bfaa49c800754aec8800a388c7
The serial console is still missing.
Up to stable/15-n280713-24f4ec797e9b
https://cgit.freebsd.org/src/commit/?h=stable/15&id=24f4ec797e9b19abd4488554c78e7ecc27313428
The serial console is still detected and and usable.
Both are GENERIC kernel. Tested on instance types: t4g.small and
m8g.2xlarge.
Sorry for the long CC list. It's based on the commit log, reviews, and of
course our aws hero.
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