[Bug 264267] UEFI Booting on Azure Generation 2 VMs crashes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264267

--- Comment #33 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=8ea7fa16d9fe5acb7d42a223efbfa23627aa5e0c

commit 8ea7fa16d9fe5acb7d42a223efbfa23627aa5e0c
Author:     Wei Hu <whu@FreeBSD.org>
AuthorDate: 2023-03-14 15:49:33 +0000
Commit:     Wei Hu <whu@FreeBSD.org>
CommitDate: 2023-03-18 07:07:54 +0000

    uart: Don't change settings or throttle putc for Hyper-V

    Azure setup does not like it when FreeBSD overrides the settings of the
    UART device. When Hyper-V is detected, don't do this and also don't
    throttle putc() output. This is a workaround for the early boot hang
    of FreeBSD on Azure.

    Tested on Azure, ESXi (VM with serial port), and SG-8200

    PR:             264267
    Reviewed by:    kevans, whu
    Tested by:      whu
    Obtained from:  Rubicon Communications, LLC (Netgate)
    MFC after:      2 weeks
    Sponsored by:   Rubicon Communications, LLC (Netgate)

 sys/dev/uart/uart_dev_ns8250.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

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