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Subject: Re: zfsloader: messy output on Dell iDrac serial console
From: Daniel Braniss <danny@cs.huji.ac.il>
In-Reply-To: <76d1549c-c721-ffcb-c27e-48e4d06c9c63@freebsd.org>
Date: Sat, 7 Apr 2018 09:35:17 +0300
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To: Julian Elischer <julian@freebsd.org>
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> On 7 Apr 2018, at 7:21, Julian Elischer <julian@freebsd.org> wrote:
>=20
> running on *some* Dell servers the serial console looks messed up at =
the time of the FreeBSD menu.
> it looks like it's dropping (or adding? but that's less likely) =
characters.
>=20
>  |  5. [K]ernel: kernel (1 of 2)           |  .- .                    =
-.
>  |  6. Configure Boot [O]ptions...         |2  --| y/       -.       =
-/`   -o/
>  |137. Select Boot [E]nvironment...        | `:`                  `:`  =
       ::/sy++:.
>  |                                         H|     .-- `--.     --  =
/6H`:                          :`
>  |                                         | .---.....----.
>=20
> IS there an RTS/CTS input we should be attending to?
>=20
> I will add that some of the other modules (e.g. the mfi raid setup =
section) also get affected,
> so it's not just a bug in our code.

I=E2=80=99m using Serial-Over-LAN via ipmi/drac and am noticing this too =
on a Dell C6220,
don=E2=80=99t know when this started though, It=E2=80=99s only recently =
that I=E2=80=99m working on
this kind of hosts. It drives the xterm/rxvt crazy, but it=E2=80=99s =
only the output from the
boot/loader, once the kernel takes over, all is back to normal. the =
serial speed is
set to 115200, but changing it as far as i remember did not help. will =
try lowering soon.
I had to disable the menu to get some sense of the output, and usually =
have to hit ^B to remove most of the
garbage.