From: andy.shevchenko@gmail.com (Andy Shevchenko)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems
Date: Tue, 4 Apr 2017 20:08:47 +0300 [thread overview]
Message-ID: <CAHp75VcUorx5D2ive8eNWhtu2BzSbYAm+y9_KeFYdkTMgsg0SA@mail.gmail.com> (raw)
In-Reply-To: <1491325150.7125.62.camel@tzanussi-mobl.amr.corp.intel.com>
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
next prev parent reply other threads:[~2017-04-04 17:08 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-01 22:21 [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Nicolas Pitre
2017-04-01 22:21 ` [PATCH v2 1/5] console: move console_init() out of tty_io.c Nicolas Pitre
2017-04-01 22:21 ` [PATCH v2 2/5] tty: move baudrate handling code to a file of its own Nicolas Pitre
2017-04-01 22:21 ` [PATCH v2 3/5] serial: small Makefile reordering Nicolas Pitre
2017-04-02 12:55 ` Andy Shevchenko
2017-04-02 15:49 ` Nicolas Pitre
2017-04-01 22:21 ` [PATCH v2 4/5] serial: split generic UART driver helper functions into a separate file Nicolas Pitre
2017-04-02 13:16 ` Andy Shevchenko
2017-04-02 15:44 ` Nicolas Pitre
2017-04-03 7:35 ` kbuild test robot
2017-04-01 22:21 ` [PATCH v2 5/5] minitty: minimal TTY support alternative for serial ports Nicolas Pitre
2017-04-02 13:22 ` [PATCH v2 0/5] minitty: a minimal TTY layer alternative for embedded systems Andy Shevchenko
2017-04-02 15:55 ` Nicolas Pitre
2017-04-03 12:56 ` Alan Cox
2017-04-03 16:06 ` Nicolas Pitre
2017-04-03 18:05 ` Alan Cox
2017-04-03 19:50 ` Nicolas Pitre
2017-04-04 13:40 ` Alan Cox
2017-04-04 19:26 ` Nicolas Pitre
2017-04-02 20:47 ` Andi Kleen
2017-04-02 21:41 ` Nicolas Pitre
2017-04-02 22:44 ` Stuart Longland
2017-04-03 1:01 ` Nicolas Pitre
2017-04-04 0:39 ` Stuart Longland
2017-04-03 18:14 ` Geert Uytterhoeven
2017-04-03 18:57 ` Rob Herring
2017-04-03 19:46 ` Geert Uytterhoeven
2017-04-03 21:05 ` Andy Shevchenko
2017-04-04 16:59 ` Tom Zanussi
2017-04-04 17:08 ` Andy Shevchenko [this message]
2017-04-04 17:59 ` Tom Zanussi
2017-04-04 18:04 ` Andy Shevchenko
2017-04-04 18:31 ` Nicolas Pitre
2017-04-04 19:58 ` Tom Zanussi
2017-04-04 20:27 ` Nicolas Pitre
2017-04-04 18:53 ` Nicolas Pitre
2017-04-03 7:54 ` Andy Shevchenko
2017-04-03 15:31 ` Andi Kleen
2017-04-03 17:27 ` Nicolas Pitre
2017-04-03 19:57 ` Adam Borowski
2017-04-03 20:09 ` Nicolas Pitre
2017-04-03 20:32 ` Adam Borowski
2017-04-03 16:40 ` Nicolas Pitre
2017-04-03 7:44 ` Greg Kroah-Hartman
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