On Fri, 14 Dec 2012, Martin Storsjö wrote:
On Fri, 14 Dec 2012, Niels Möller wrote:
Second item is more directly related to Nettle. I will get funding from
Internetfonden, for "Adapting GNU Nettle for embedded systems". This
will mean two things: Support for elliptic curve signatures (and
possibly some other ECC-related things), and optimizations for the ARM
architecture. The funding is for 420 hours of work, most of which will
be spent during the spring, and the project will be carried out under
the umbrella of Southpole Consulting.
A question for the list: Which variants of the ARM family are most
important for Nettle applications? I'm not yet very familiar with the
ARM world, but the following are some alternatives for testing and
benchmarking:
* The current most high-end processor, Cortex-A15, where an affordable
development system seems to be a recent "chromebook". Not sure exactly
which model, but I guess it's this one:
http://www.amazon.co.uk/Samsung-Chromebook-Wifi-Latest-Model/dp/B009RF0AQ8/ref=sr_1_1?s=computers&ie=UTF8&qid=1355494569&sr=1-1
* The previous "most high-end" processor, Cortex-A9. An affordable
development system is the PandaBoard.
http://www.omappedia.com/wiki/PandaBoard_FAQ
* The Raspberry Pi computer, featuring an older (obsolete?) ARM1176JFZ,
"ARMv6" architecture.
http://www.raspberrypi.org/faqs
* The low-end Cortex-M0, competing with less than $1 microcontrollers.
Also "ARMv6" architecture. An affordable development system seems to
be LPCXPRESSO board.
http://www.embeddedartists.com/products/lpcxpresso/lpc11U14_xpr.php
And if anybody here has some interesting ARM hardware to donate to the
project, this is the right time.
As far as I know, for use in smartphones and similar, most current ones run
ARMv7, on Cortex-A8/A9.
I forgot to add - one noteworthy detail is that Cortex-A9 has out-of-order
execution, which the A8 and earlier lack. So for hand-scheduling of
instructions, you'll want an A8 or older (a beagleboard/beaglebone is a
good choice for that, especially if you want to hand-schedule NEON
instructions).
// Martin
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