lkml.org 
[lkml]   [2017]   [Nov]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] arm: l2c: unlock ways when in non-secure mode
On Sun, Nov 26, 2017 at 11:56:10PM +0000, Peng Fan wrote:
> Hi Russell,
>
> > Subject: Re: [PATCH] arm: l2c: unlock ways when in non-secure mode
> >
> > On Sun, Nov 26, 2017 at 08:25:30PM +0800, Peng Fan wrote:
> > > To boot Linux in Non-secure mode with l2x0, the l2x0 controller is
> > > enabled in secure mode and ways locked to make it seems L2 cache
> > > disabled during linux boot process. So during l2x0 initialization,
> > > need to unlock the ways to make l2x0 could cache data/inst.
> >
> > Why was this chosen instead of doing what everyone else does?
>
> I am not aware of how other platform handles the l2x0 unlock in non
> secure mode. Could you please share with me what others choose?

That's not what I was asking.

Everyone else provides a way for the l2x0 controller to be enabled and
disabled from non-secure mode.

Why have you decided to enable the l2x0 controller and leave it enabled,
and then lock down all the cache ways - which means you need the kernel
to do something entirely different for your platform.

--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 8.8Mbps down 630kbps up
According to speedtest.net: 8.21Mbps down 510kbps up

\
 
 \ /
  Last update: 2017-11-27 10:20    [W:0.062 / U:2.140 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site