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

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Message-ID: <CAHp75VdgEcyXPxENS87nHLtCEHqB5Z-1_T_W1opSiKqqNpeU2A@mail.gmail.com>
Date:   Mon, 3 Apr 2017 10:54:31 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     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 Mailing List <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 12:41 AM, Nicolas Pitre <nicolas.pitre@...aro.org> wrote:
> On Sun, 2 Apr 2017, Andi Kleen 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.

Are you sure you need Linux there? There is a nice Zephyr project
(OpenSource RTOS, POSIX compatible) exactly for microcontrollers.

While I can agree on making Linux stuff less fatty, I can't agree on
doing this way. We have for now two subsystems to serve for serial
devices, you are proposing third one for only narrow class of devices.
>From my point of view is better to achive your goal with existing
system (as a proof of concept maybe even with ugly #ifdef:fery).

-- 
With Best Regards,
Andy Shevchenko