use invd instead of wbinvd in real mode start code

[Bin Meng]

On Mon, Feb 17, 2020 at 10:00 PM Andy Shevchenko
<andy.shevchenko at gmail.com> wrote:
>
> On Mon, Feb 17, 2020 at 3:52 PM Bin Meng <bmeng.cn at gmail.com> wrote:
> > On Mon, Feb 17, 2020 at 9:47 PM Andy Shevchenko
> > <andy.shevchenko at gmail.com> wrote:
> > > On Mon, Feb 17, 2020 at 3:39 PM Andy Shevchenko
> > > <andy.shevchenko at gmail.com> wrote:
> > > > On Mon, Feb 17, 2020 at 2:41 PM Masahiro Yamada <masahiroy at kernel.org> wrote:
> > > > > On Mon, Feb 17, 2020 at 9:31 PM Andy Shevchenko
> > > > > <andy.shevchenko at gmail.com> wrote:
>
> ...
>
> > > OK, as my intuition told me the problematic one is
> > >
> > > commit 0d67fac29f3187e67f4fd3ef15f73e91be2fad12
> > > Author: Masahiro Yamada <masahiroy at kernel.org>
> > > Date:   Wed Jan 8 20:08:44 2020 +0900
> > >
> > >    x86: use invd instead of wbinvd in real mode start code
> > >
> > >
> > > Please, revert or fix ASAP before v2020.04 release!
> > > ^^^
> > >
> > > > > > P.S. I dunno how it has been tested, so, if you have Intel Edison in
> > > > > > possession, please, don't forget to test on it. It's not first time
> > > > > > the Intel Edison behaviour is broken due to poor testing.
> > > > >
> > > > >
> > > > > I tested my patches on qemu.
> > > >
> > > > Exactly my point of definition "poor".
> > > > It's not first time (and not last) when QEmu sucks.
> > > >
> > > > > Sorry for the breakage on your board, but I do not
> > > > > have Edison board.
> > > > > It is not possible to test every board.
> > > >
> > > > No problem, it's rather to x86 maintainers to have at least one-two
> > > > real hardware testing before applying this.
> > > > QEMU is completely not enough!
>
> > Is that because on Intel Edison U-Boot is not the first stage bootloader?
>
> I don't know for sure, but I may speculate that this is a prerequisite.

anyway, for now please send a revert patch.

Regards,
Bin