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

[Kevin Hilman <khilman@kernel.org>]

Simon Glass <sjg@chromium.org> writes:

> On 8 December 2014 at 18:27, Kevin Hilman <khilman@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 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