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Groups > linux.kernel > #1615519
| From | Geert Uytterhoeven <geert@linux-m68k.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems |
| Date | 2017-04-03 21:50 +0200 |
| Message-ID | <tsg9c-2Mf-15@gated-at.bofh.it> (permalink) |
| References | (1 earlier) <trUBJ-5rN-53@gated-at.bofh.it> <trVxM-6aX-7@gated-at.bofh.it> <trWDw-6PH-11@gated-at.bofh.it> <tseK6-1XU-15@gated-at.bofh.it> <tsfmO-2dG-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Mon, Apr 3, 2017 at 8:57 PM, Rob Herring <robh@kernel.org> wrote:
> On Mon, Apr 3, 2017 at 1:14 PM, Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>> On Mon, Apr 3, 2017 at 12:44 AM, Stuart Longland
>> <stuartl@longlandclan.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.
>
> These are different target uses. We're talking about fixed function,
> statically linked user space at the minimum (some may want no
> userspace even). Applications that could use an RTOS instead but
> benefit from the Linux hardware support, features and ecosystem. It's
> not a whole new code base or environment to learn. Maybe Zephyr will
> have traction and improve things, but projects I've been involved with
> using RTOSs generally have discussions around needing to re-write the
> crappy RTOS.
Sure. I just wanted to point out that there was a time you could have
_more_ than you need for small fixed function embedded systems in
2 MiB of RAM.
> The absolute amount of RAM target is not so important. What's
> important is getting to a size feasible for onchip RAM. That's always
> moving (up), but has generally been out of reach for Linux.
DigiKey shows 39 ARM SoCs with 1 MiB or more of RAM.
But once you want 3 MiB or more, the lone winner is Renesas' RZ/A1 (up to
10 MiB).
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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
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[PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-02 00:40 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-04-02 15:30 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-02 18:00 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Alan Cox <alan@linux.intel.com> - 2017-04-03 15:00 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-03 18:10 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Alan Cox <alan@linux.intel.com> - 2017-04-03 20:10 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-03 22:00 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Alan Cox <alan@linux.intel.com> - 2017-04-04 15:50 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-04 21:30 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Andi Kleen <andi@firstfloor.org> - 2017-04-02 22:50 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-02 23:50 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Stuart Longland <stuartl@longlandclan.id.au> - 2017-04-03 01:00 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-03 03:10 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Stuart Longland <stuartl@longlandclan.id.au> - 2017-04-04 02:50 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Geert Uytterhoeven <geert@linux-m68k.org> - 2017-04-03 20:20 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Rob Herring <robh@kernel.org> - 2017-04-03 21:00 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Geert Uytterhoeven <geert@linux-m68k.org> - 2017-04-03 21:50 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-04-03 23:10 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Tom Zanussi <tom.zanussi@linux.intel.com> - 2017-04-04 19:00 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-04-04 19:10 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Tom Zanussi <tom.zanussi@linux.intel.com> - 2017-04-04 20:00 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-04-04 20:10 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-04 20:40 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Tom Zanussi <tom.zanussi@linux.intel.com> - 2017-04-04 22:00 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-04 22:30 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-04 21:00 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-04-03 10:00 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Andi Kleen <andi@firstfloor.org> - 2017-04-03 17:40 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-03 19:30 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Adam Borowski <kilobyte@angband.pl> - 2017-04-03 22:00 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-03 22:10 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Adam Borowski <kilobyte@angband.pl> - 2017-04-03 22:40 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2017-04-03 18:50 +0200
Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-04-03 09:50 +0200
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