[U-Boot] [PATCH 7/7] sunxi: Add environment settings to make extlinux.conf booting work

[Tom Rini]

On Fri, Aug 01, 2014 at 02:22:40PM -0600, Stephen Warren wrote:
> On 08/01/2014 02:05 PM, Dennis Gilmore wrote:
> >On Fri, 01 Aug 2014 12:57:31 -0600
> >Stephen Warren <swarren at wwwdotorg.org> wrote:
> >
> >>On 08/01/2014 01:46 AM, Hans de Goede wrote:
> >>>Automatic booting using an extlinux.conf file requires various
> >>>environment variables to be set.
> >>
> >>Acked-by: Stephen Warren <swarren at nvidia.com>
> >>
> >>I'd personally be tempted to set fdt_high=0xffffffff,
> >>initrd_high=0xffffffff to stop U-Boot copying the DT/initrd from the
> >>load location to some other location under 256M, but that's just an
> >>optimization and entirely optional.
> >
> >There has been quite a few times where using 0xffffff has caused
> >issues.
> 
> What kind of issues?
> 
> At least for Tegra, I've carefully chosen the values for the various
> load addresses so that there won't be issues. (Without that I can
> easily see the potential for issues.) I've seen far more repeated
> problems when U-Boot moves the DT/initrd around than than when it
> didn't (none in that case). Besides, it's completely redundant and
> unnecessary work if the blobs are already loaded at sane addresses,
> which they are on Tegra at least.

Just how large of a kernel have you thrown on a Tegra?  32MB might seem
reasonable at first but it wouldn't be overly surprised if someone can
shove a BSS into there.  I know I shoved DT into 128MB by default
because a 32bit ARM kernel isn't functional at that size.

-- 
Tom
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