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

From Andy Shevchenko <andy.shevchenko@gmail.com>
Newsgroups linux.kernel
Subject Re: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems
Date 2017-04-04 19:10 +0200
Message-ID <tsA7T-7Nb-5@gated-at.bofh.it> (permalink)
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On Tue, Apr 4, 2017 at 7:59 PM, Tom Zanussi <tom.zanussi@linux.intel.com> wrote:
> On Tue, 2017-04-04 at 00:05 +0300, Andy Shevchenko wrote:

> Yes, in a previous project, I had been working toward getting a < 1M
> system to boot on Galileo hardware (which it did, but using more than
> that - the Galileo2 has 256MB, but it was the target hardware at the
> time, and I was hoping eventually to be able to boot out of the 512k
> on-chip SRAM).
>
> I was focused at that point mainly on the kernel static size, and using
> a combination of Josh Triplett's tinification tree, Andi Kleen's LTO and
> net-diet patches, and my own miscellaneous patches that I was planning
> on eventually upstreaming, I ended up with a system that I could boot to
> shell with a 455k text size:
>
> Memory: 235636K/245176K available (455K kernel code, 61K rwdata,
> 64K rodata, 132K init, 56K bss, 3056K reserved, 0K cma-reserved)
>
> virtual kernel memory layout:
>     fixmap  : 0xfffe5000 - 0xfffff000   ( 104 kB)
>     vmalloc : 0xd05f0000 - 0xfffe3000   ( 761 MB)
>     lowmem  : 0xc0000000 - 0xcfdf0000   ( 253 MB)
>       .init : 0xc1094000 - 0xc10b5000   ( 132 kB)
>       .data : 0xc1071fac - 0xc1092760   ( 129 kB)
>       .text : 0xc1000000 - 0xc1071fac   ( 455 kB)
>
> That was without networking.  Enabling networking added about 250k, and
> at that point I could ssh in and run a webserver, still less than 1M as
> far as kernel static size, which of course completely ignores the kernel
> dynamic size and userspace.

Thanks for sharing your experience. The question closer to this
discussion what did you do against TTY/UART/(related) layer(s)?

-- 
With Best Regards,
Andy Shevchenko

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Thread

[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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