Messages in this thread | | | Date | Tue, 10 Sep 2019 15:37:32 +0100 | From | Sebastian Reichel <> | Subject | Re: [RFC] ARM: omap3: Enable HWMODS for HW Random Number Generator |
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Hi,
On Tue, Sep 10, 2019 at 08:56:49AM -0500, Adam Ford wrote: > On Thu, Sep 5, 2019 at 6:04 PM Tony Lindgren <tony@atomide.com> wrote: > > Oh and this needs to default to status = "disabled" for > > HS devices like n900 as it needs to use the omap3-rom-rng. > > I don't know enough about the HS version of the OMAP3, but what's the > main difference between omap3-rom-rng and this one?
The OMAP HS chips have the bus firewall configured to block direct access to some cryptography related devices. The kernel will crash with a bus error, if you try to read/write the registers for protected devices. The omap3-rom-rng avoids this by communicating with the security middleware component instead of directly accessing the RNG hardware.
-- Sebastian [unhandled content-type:application/pgp-signature] | |