[U-Boot] Use .data section in SPL ?

[Tom Rini]

On Wed, Dec 10, 2014 at 07:13:51PM -0700, Simon Glass wrote:
> Hi Tom,
> 
> On 10 December 2014 at 19:04, Tom Rini <trini at ti.com> wrote:
> > On Wed, Dec 10, 2014 at 06:56:02PM -0700, Simon Glass wrote:
> >> Hi Tom,
> >>
> >> On 10 December 2014 at 07:06, Tom Rini <trini at ti.com> wrote:
> >> > On Wed, Dec 10, 2014 at 04:39:39PM +0900, Masahiro Yamada wrote:
> >> >> Hi.
> >> >>
> >> >>
> >> >> I notice  SPL is using .data section
> >> >>
> >> >>
> >> >>
> >> >> u32 *boot_params_ptr = NULL;
> >> >> struct spl_image_info spl_image;
> >> >>
> >> >> /* Define board data structure */
> >> >> static bd_t bdata __attribute__ ((section(".data")));
> >> >>
> >> >>
> >> >>
> >> >> If SPL is running on an execute-in-place device such NOR flash,
> >> >> .data section is not writable.
> >> >>
> >> >> common/spl/spl_nor.c does not work.
> >> >
> >> > spl_nor.c only works today on PowerPC where there's nothing shoved into
> >> > the .data section.
> >> >
> >> > And all of this is related to what's needed to enable DM in SPL on ARM
> >> > as well, iirc anyhow.
> >>
> >> Can you please explain the SPL problem on ARM a bit more? If It could
> >> understand what is going on, or how to repeat it, I might be able to
> >> help. I'd really like to enable this DM SPL support...
> >
> > Did you see the WIP patch I sent out in reply to the SPL DM series?
> 
> Not that I recall - you mean this one?
> 
> http://patchwork.ozlabs.org/patch/417792/
> 
> I might have been asleep. Will take a look.

Yup, that's the one.  Fixing that (and the similar constructs the other
TI platforms have) and then a few other similar constructs elsewhere is
why we have to throw things into .data but write to them today in ARM.

-- 
Tom
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