/dev/random on PPC40EXr

Tirumala Reddy Marri tmarri at amcc.com
Thu Apr 2 04:05:00 EST 2009

There is PKA/TRNG driver for sure. Let me check if it was accepted in
opensource yet. Otherwise I will forward you the driver which may not be
there in opensource yet.

-----Original Message-----
From: linuxppc-dev-bounces+tmarri=amcc.com at ozlabs.org
[mailto:linuxppc-dev-bounces+tmarri=amcc.com at ozlabs.org] On Behalf Of
Felix Radensky
Sent: Wednesday, April 01, 2009 5:00 AM
To: linuxppc-dev at ozlabs.org
Subject: /dev/random on PPC40EXr


On my custom board based on 405EXr /dev/random produces no output
at all, and /dev/urandom is not random enough for our purposes. Saving
entropy pool between reboots doesn't help much.

What can be done to increase the entropy of the system ?
I was thinking of adding IRQF_SAMPLE_RANDOM to network driver,
but since not too many drivers implement it, I don't know whether
it's a good idea or not. 

Is there any work in progress to develop hw_random driver for 4xx

Thanks a lot.

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