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    SubjectRe: [RFC] ARM: omap3: Enable HWMODS for HW Random Number Generator
    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
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