[U-Boot] ARM: bootm: Allow booting in secure mode on hyp capable systems

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On Oct. 15, 2014, 10:25 a.m., Albert ARIBAUD wrote:

> Hi Marc, Hans,
>
> On Wed, 15 Oct 2014 11:18:28 +0100, Marc Zyngier <marc.zyngier@arm.com>
> wrote:
>
> > On Wed, Oct 15 2014 at 11:13:05 AM, Hans de Goede <hdegoede@redhat.com> wrote:
> > > Older Linux kernels will not properly boot in hype mode, add support for a
> > > bootm_boot_mode environment variable, which when set to "sec" will cause
> > > u-boot to boot in secure mode even when build with non-sec (and hyp) support.
> > >
> > > Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> >
> > Looks good to me.
> >
> > Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> >
> > 	M.
>
> Should we consider this a bugfix?

This is not really a bug fix, this adds a mechanism to select between secure /
non secure boot on non-secure boot capable systems, as some older kernels do not
work in non-secure mode. Even with this in place old (broken) kernels will still
not magically work. Some sunxi specific patches are needed for that, as well as
the user actually setting the environment variable.

I'm targetting the next u-boot release for getting old sunxi kernels to work for
people who prefer using those kernels.

> For instance, hHow old are these "older kernels"?

The linux-sunxi kernel I'm specifically targetting is a 3.4 kernel, but this should
be useful in general on all platforms which support booting in non-secure mode.

Regards,

Hans