linux-kernel - Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems

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Message-ID: <CAMuHMdUTW7Fh+3kWKFCToqhaz-+58--=Sx1Zv0KRnVY4bDKOGQ@mail.gmail.com>
Date:   Mon, 3 Apr 2017 20:14:08 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Stuart Longland <stuartl@...glandclan.id.au>
Cc:     Nicolas Pitre <nicolas.pitre@...aro.org>,
        Andi Kleen <andi@...stfloor.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for
 embedded systems

On Mon, Apr 3, 2017 at 12:44 AM, Stuart Longland
<stuartl@...glandclan.id.au> wrote:
> On 03/04/17 07:41, Nicolas Pitre wrote:
>>> No PTYs seems like a big limitation. This means no sshd?
>> Again, my ultimate system target is in the sub-megabyte of RAM.  I
>> really doubt you'll be able to fit an SSH server in there even if PTYs
>> were supported, unless sshd (or dropbear) can be made really tiny.
>> Otherwise you most probably have sufficient resources to run the regular
>> TTY code.
>
> Are we talking small microcontrollers here?  The smallest machine in
> terms of RAM I ever recall running Linux on was a 386SX/25 MHz with 4MB
> RAM, and that had a MMU.

Let's halve that. I once tried and ran Linux in 2 MiB, incl. X, twm, and xterm.
Of course with swap enabled.  And swapping like hell.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds