[U-Boot] [PATCH v9 2/2] Odroid-XU3: Add documentation for Odroid-XU3

[Simon Glass]

Hi Kevin,

On 9 December 2014 at 17:03, Kevin Hilman <khilman at kernel.org> wrote:

> Simon Glass <sjg at chromium.org> writes:
>
> > On 8 December 2014 at 18:27, Kevin Hilman <khilman at kernel.org> wrote:
> >>
>
> [...]
>
> >> So is secure-mode enabled before BL2 is started?  Or do you mean BL2 is
> >> where secure-mode is enabled?  If it's done in BL2, and if the
> >> hardkernel folks are willing to sign BL2 images (which I gathered from
> >> discussions elsewhere in this series) then it seems possible to turn off
> >> secure-mode.
> >
> > Yes it is possible - and easy - to do in BL2 / U-Boot SPL. This is
> > what the Chromebooks do.
>
> OK, good.
>
> >>
> >> So I went to look in the u-boot-samsung repo and didn't see the code for
> >> the SPL there.  Is the BL2 source (which I understood to be u-boot SPL)
> >> in some other repo?
> >
> >
> > It's in mainline U-Boot so no particular need to go to the Samsung
> > tree.
>
> I went to the samsung tree since the cover letter for this series
> pointed me there.  But I just tried the latest version of this series
> (v11) using mainlin u-boot.  Thanks for the pointer.
>
> > See arch/arm/cpu/armv7/exynos/spl_boot.c and tzpc.c for the
> > TrustZone stuff.
>
> OK, thanks.  Any pointers on how to get this building with mainline
> u-boot?  Just adding CONFIG_SPL to odroid_xu3.h doesn't seem to work
> (compile errors.)  I'm quite comfortable in the kernel, but I'm not very
> familiar with u-boot, especially SPL.
>

It's normally automatic unless some special disabling was done - see
spl/u-boot-spl.bin in the output. You need to sign it though :-(


> >> > It takes us back to the 1960s where we sent off our code at night to
> >> > run it :-)
> >> >
> >> > I think the best bet is the current effort to mainline the rest of the
> >> > Chromebook code then try to build it for XU3.
> >>
> >> What's the status of that effort?
> >
> > Coming along but the big/little support is still not there. The
> > display works and most core peripherals. Needs more SPL work.
>
> OK, I'll be glad to be a beta tester if/when you get to that point.
>
> Thanks,
>
> Kevin
>

Regards,
Simon