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From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: u-boot@lists.denx.de
Subject: use invd instead of wbinvd in real mode start code
Date: Mon, 17 Feb 2020 16:00:40 +0200	[thread overview]
Message-ID: <CAHp75VdD9TSwOavFuVXWAU+3hmhMG17gAEefd38T=Z8pv8GHLQ@mail.gmail.com> (raw)
In-Reply-To: <CAEUhbmWRkqeFjE6OwUZnwvM391qVdAQHtPzmrQFq0CPwv068RA@mail.gmail.com>

On Mon, Feb 17, 2020 at 3:52 PM Bin Meng <bmeng.cn@gmail.com> wrote:
> On Mon, Feb 17, 2020 at 9:47 PM Andy Shevchenko
> <andy.shevchenko@gmail.com> wrote:
> > On Mon, Feb 17, 2020 at 3:39 PM Andy Shevchenko
> > <andy.shevchenko@gmail.com> wrote:
> > > On Mon, Feb 17, 2020 at 2:41 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
> > > > On Mon, Feb 17, 2020 at 9:31 PM Andy Shevchenko
> > > > <andy.shevchenko@gmail.com> wrote:

...

> > OK, as my intuition told me the problematic one is
> >
> > commit 0d67fac29f3187e67f4fd3ef15f73e91be2fad12
> > Author: Masahiro Yamada <masahiroy@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.

-- 
With Best Regards,
Andy Shevchenko

  reply	other threads:[~2020-02-17 14:00 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAHp75VdtevMO=AWeZZ-kfmo0Dx5RrGBZEW8Mm5ubLU2pm3Nh=g@mail.gmail.com>
2020-02-17 12:31 ` Fwd: use invd instead of wbinvd in real mode start code Andy Shevchenko
2020-02-17 12:33   ` Andy Shevchenko
     [not found] ` <CAK7LNASQuuEWCypyK+TDYa1eYk__KKRZ1Z8JgsEbhd+4KNFNjw@mail.gmail.com>
     [not found]   ` <CAHp75Veri=85osuFy0xDukEKN9zAULJpk+1sTdHynTL_deK=0Q@mail.gmail.com>
2020-02-17 13:47     ` Andy Shevchenko
2020-02-17 13:52       ` Bin Meng
2020-02-17 14:00         ` Andy Shevchenko [this message]
2020-02-17 14:49           ` Bin Meng
2020-02-17 15:31             ` Andy Shevchenko
2020-02-17 15:09       ` Wolfgang Denk
2020-02-17 15:13         ` Tom Rini
2020-02-17 15:32         ` Andy Shevchenko
2020-02-17 15:33           ` Andy Shevchenko
2020-02-17 16:02             ` Tom Rini
2020-02-17 16:04           ` Wolfgang Denk
2020-02-18  5:48             ` Heiko Schocher
2020-02-18 10:45               ` Andy Shevchenko
2020-02-18 11:06                 ` Heiko Schocher
2020-02-18 11:29                   ` Andy Shevchenko
2020-02-18 14:43                     ` Tom Rini
2020-02-18 15:37                       ` Andy Shevchenko
2020-02-19 13:14                   ` Wolfgang Denk
2020-02-19 13:42                     ` Tom Rini
2020-02-19 14:04                       ` Heiko Schocher
2020-02-17 16:05           ` Tom Rini

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