lkml.org 
[lkml]   [2019]   [Sep]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
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
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2019-09-10 16:38    [W:2.528 / U:0.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site