Messages in this thread |  | | Date | Thu, 2 Apr 2020 09:13:47 +0100 | From | Will Deacon <> | Subject | Re: [PATCH] Documentation: dt-bindings: Document 'rng-seed' for /chosen |
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Hi Florian,
On Wed, Apr 01, 2020 at 08:36:40PM -0700, Florian Fainelli wrote: > The /chosen node can have a 'rng-seed' property read as a u32 quantity > which would contain a random number provided by the boot agent. This is > useful in configurations where the kernel does not have access to a > random number generator. > > Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> > --- > Documentation/devicetree/bindings/chosen.txt | 13 +++++++++++++ > 1 file changed, 13 insertions(+)
Thanks for doing this; I realised it was undocumented the other day when I tried to look it up myself.
> diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt > index 45e79172a646..126b31eecfeb 100644 > --- a/Documentation/devicetree/bindings/chosen.txt > +++ b/Documentation/devicetree/bindings/chosen.txt > @@ -28,6 +28,19 @@ mode) when EFI_RNG_PROTOCOL is supported, it will be overwritten by > the Linux EFI stub (which will populate the property itself, using > EFI_RNG_PROTOCOL). > > +rng-seed > +-------- > + > +This property is used to initialize the kernel's entropy pool from a > +trusted boot agent capable of providing a random number. It is parsed > +as a u32 value, e.g.
Are you sure about this being limited to a u32 value? I thought you could pass an arbitrary-length value here.
Will
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