[Cryptech Tech] FPGA tasks

[Paul Selkirk]

On 04/08/2015 05:13 PM, Павел Шатов wrote:
> On 08.04.2015 18:28, Joachim Strömbergson wrote:
>> (1) Paul has been trying to build the complete FPGA for the Novena but
>> with i2c interface. This should be a more relaxed design than EIM, but
>> Paul can't get timimg closure. Your Xilinx knowledge would be a great
>> help.
> 
> Speaking of FPGA issues, let's start from (1). What repository contains
> this simplified I2C system? Is it under test/novena_i2c_simple?

I've abandoned novena_i2c_simple as a noble experiment that doesn't fit
with our core selector and memory map, which is why I moved it from core
to test.

The design I've been trying to build is core/platform/novena/i2c/build
(I've only tried with the command-line tools, not with ISE, but it
should be the same, of course). It has the hash cores, plus the rng
cores, plus chacha for the mixer. The same set of modules builds in
reasonable time with eim, but fails to converge with i2c.

OTOH, i2c is a bit of a side-show, since we've got eim working now. I
just like to verify that changes work with all communication channels,
or at least don't gratuitously break a supported configuration. (e.g. I
can't actually verify that the terasic/uart code still works, because I
don't have that board to run it on, but I have the toolset, and I can
verify that it builds something.)

So I wouldn't put a lot of energy into i2c, unless it somehow gets us to
a more efficient design for the novena, and thus for the alpha board.

				paul