[U-Boot] [PATCH 1/1 v2] omap3_beagle: Enabling UART3 first allows the Transmitter to be empty

[Tom Rini]

On Wed, Mar 27, 2013 at 10:29:00AM +0100, Javier Martinez Canillas wrote:
> On Wed, Mar 27, 2013 at 5:50 AM, Manfred Huber <man.huber at arcor.de> wrote:
> > Please test the Patch. It is very simple on a Beagleboard. I guess you
> > have flashed the actual SPL and u-boot and Beagleboard boots correctly.
> > Now press and hold 'User' button and connect power. SPL should hang.
> > You can see some symbols on the console from the ROM code.
> >
> 
> Hi Manfred,
> 
> I don't have access to my IGEP board right now but I'll test your
> patch as soon as posible.
> 
> > Install the Patch, compile it and flash the NAND. Beagleboard still
> > boots correctly. Now press and hold 'User' button again and Beagleboard
> > should also boot correctly. The Patch works.
> >
> > I suspect the IGEP board has the same bug. If so, the Patch should work
> > on this board too and we don't need CONFIG_SYS_NS16550_BROKEN_TEMT
> > anymore.
> >
> 
> I still think that we should keep CONFIG_SYS_NS16550_BROKEN_TEMT or
> something similar instead of just checking for CONFIG_OMAP34XX. Since
> we don't know if this problem is also present on other TI OMAP
> platforms (or any other platform). I would just change
> CONFIG_SYS_NS16550_BROKEN_TEMT semantics once is confirmed that this
> also fixes the issue on IGEP boards.

I'm attempting to see if this ROM bug is (a) known and (b) is or was
fixed at some point.  Based on what I know (or at least think I know) of
how the ROM code lived for "OMAP3", given that you're seeing this on
beagle and igep, it's a valid assumption that OMAP34XX is buggy.  The
question I have (and hope for resolution on) is if it's a problem on
am335x/omap4 or later as well.  If I follow how to reproduce this issue
(and I think I do), assuming I can I'll setup an am335x platform in a
similar position.

> > If you don't want a patch for this bug please let me know. I will not
> > bother you again.
> >
> 
> Thanks a lot for working on this. Some people work on mainline U-Boot
> on their free time (like myself) so it can take a few days until you
> get a response about a patch. Please be patient :-)

Yes, thanks for working this issue through, I also appreciate it!

-- 
Tom
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