linux-kernel - Re: [PATCH v3 0/4] Raspberry Pi 4 HWRNG Support

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Date:   Wed, 20 Nov 2019 17:16:47 +0100
From:   Stefan Wahren <wahrenst@....net>
To:     Stephen Brennan <stephen@...nnan.io>
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Scott Branden <sbranden@...adcom.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, Ray Jui <rjui@...adcom.com>,
        linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>,
        Rob Herring <robh+dt@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com,
        Stefan Wahren <wahrenst@....net>,
        Matt Mackall <mpm@...enic.com>, Arnd Bergmann <arnd@...db.de>,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH v3 0/4] Raspberry Pi 4 HWRNG Support

Hi Stephen,

Am 20.11.19 um 04:16 schrieb Stephen Brennan:
> This patch series enables support for the HWRNG included on the Raspberry
> Pi 4.  It is simply a rebase of Stefan's branch [1]. I went ahead and
> tested this out on a Pi 4.  Prior to this patch series, attempting to use
> the hwrng gives:
>
>     $ head -c 2 /dev/hwrng
>     head: /dev/hwrng: Input/output error
>
> After this series, the same command gives two random bytes.

just a note: a more expressive test would be running rngtest (package
rng-tools) on this device.

Regards
Stefan