[ECOS] eCos API to get random value or UID value?

Stanislav Meduna stano@meduna.org
Sun Mar 20 19:16:00 GMT 2011


On 18.03.2011 20:52, Grant Edwards wrote:

> Is there any eCos API support that the HAL can use to provide either
> random data or a unique id value to application or OS code?

I don't know of any.

> Both random values and UUID values are required for a lot of network
> stuff.  It's pretty common for hardware platforms to one or both,
> there doesn't seem to be an eCos API to access it.

This is a very good request.

However, I don't think this belongs into the HAL - it's more
a device driver semantics (see e.g. /dev/{u,}random on linux)
and the cyg_io_lookup / cyg_io_read is everything one needs
here.

What the HAL could provide is an interface supplying a source
of entropy - however, this is hard to do correctly especially
on an embedded system that is often running in a quite
deterministic environment.

-- 
                                Stano

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