use invd instead of wbinvd in real mode start code

[Wolfgang Denk <wd@denx.de>]

Dear Heiko,

In message <7d480cee-88aa-f4e3-7e3d-8740bbdcc224@denx.de> you 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.

Maybe it would be nice for people who don't know tbot if you could
link to some examples for such testcases?  I think this should even
be covered in the tbot docs?

Best regards,

Wolfgang Denk

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