[U-Boot] Tinker-rk3288 SPL broken with MMC timeout

[Tom Rini <trini@konsulko.com>]

On Fri, Sep 13, 2019 at 08:11:17AM +0530, Jagan Teki wrote:
> On Thu, Sep 12, 2019 at 8:25 PM Tom Rini <trini@konsulko.com> wrote:
> >
> > On Thu, Sep 12, 2019 at 08:55:24AM +0530, Jagan Teki wrote:
> >
> > > I have seen this even on v2019.07 release, and the only release that
> > > it got working with on v2019.01 (SPL, BROM_RETURN)
> > >
> > > Any idea? here is the log dump.
> > >
> > > U-Boot TPL 2019.10-rc3-00297-g5ba8b12543 (Sep 12 2019 - 08:50:36)
> > > Trying to boot from BOOTROM
> > > Returning to boot ROM...
> > >
> > > U-Boot SPL 2019.10-rc3-00297-g5ba8b12543 (Sep 12 2019 - 08:50:36 +0530)
> > > Trying to boot from MMC1
> > > spl: mmc init failed with error: -110
> > > SPL: failed to boot from all boot devices
> > > ### ERROR ### Please RESET the board ###
> >
> > Time to run 'git bisect' since you know when it worked last at least?
> 
> Look hard to bisect, few of commits in between seems SPL size
> blow-out, doesn't boot etc. May be verify with respect boards might
> help.

It certainly sounds like a challenging bisect, yes.  I've 'bisect
skip'ed and then 'git stash save' / 'git stash apply' a handful of
work-arounds to narrow down hard cases like this before.  It's also
worth keeping in mind that you can insert steps manually into a bisect.
For something like this where v2019.01 works and HEAD doesn't, I'd do:
$ git bisect start
$ git bisect good v2019.01
$ git bisect bad v2019.10-rc3
$ git checkout v2019.04
and see what happens.

-- 
Tom
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