use invd instead of wbinvd in real mode start code

[Tom Rini <trini@konsulko.com>]

On Tue, Feb 18, 2020 at 01:29:04PM +0200, Andy Shevchenko wrote:
> On Tue, Feb 18, 2020 at 1:06 PM Heiko Schocher <hs@denx.de> wrote:
> > Am 18.02.2020 um 11:45 schrieb Andy Shevchenko:
> > > On Tue, Feb 18, 2020 at 7:48 AM Heiko Schocher <hs@denx.de> wrote:
> 
> ...
> 
> > > How the feed back line is organized? I mean how host system will know that
> > >   a) we done flash correctly?
> > >   b) the booted image is bad or good?
> >
> > For both questions the answer is, that you need to write a testcase
> > which answer this question.
> >
> > For a) you flash the image in some way through U-Boot commands. You
> > start this commands from a tbot testcase written in python and parse
> > the output and/or return code of the command and than decide ...
> >
> > Same for b) reboot the board, check if new version is installed
> > by parsing the U-Boot bootlog, than start U-Boot commands to find
> > out, if current installed version is good or bad.
> 
> Thank you for elaboration.
> I hoped and still hope that x86 won't be broken so drastically that I
> need real bisection.
> Above mentioned test cases is somewhat time consuming (yes, I agree
> that is ~one time big effort), and for now it seems much bigger effort
> than just guess by reading the code. Maybe in the future I'll consider
> to do something like this, but I think that U-Boot may gain some
> patches and config option to have BAT cases enabled (like predefined
> output on the serial when we consider commit is good and some C&C
> interface during the test).

Please note that you don't need to go and write a test case for "does it
boot" as we already have one as part of our test/py/ code.

-- 
Tom
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