[U-Boot] Beagleboard: SPL hangs on serial init

[Tom Rini]

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On 03/19/2013 08:05 PM, Javier Martinez Canillas wrote:
> On Tue, Mar 19, 2013 at 3:49 PM, Tom Rini <trini at ti.com> wrote:
>> On Sat, Mar 16, 2013 at 02:13:54PM +0100, Manfred Huber wrote:
>> 
>>> I'm surprised that no one is interested in a functioning 
>>> Beagleboard. Has no one tested the Beagleboard since 
>>> 2012-09-19?
>> 
>> I don't see this problem on mine (classic and xM), which is 
>> probably part of the why.  I'm inclined to accept the patch, but 
>> can you try two things please: - How reproducible is this 
>> problem, with the host and beagleboard combination you have? 
>> 100%? - Do you have another beagleboard or another host PC (or 
>> USB-Serial dongle) you can try?
>> 
>> Thanks!
>> 
>> -- Tom
> 
> Hi,
> 
> I had this issue on another TI OMAP3 based board (IGEPv2) which
> use an DM3730 processor. Other IGEP board users reported that
> U-Boot hung on their boards and that a patch to not wait for the 
> Transmitter Empty (TEMT) to initialize the serial console fixed
> the issue. So I added the CONFIG_SYS_NS16550_BROKEN_TEMT config
> option and used it for IGEP boards (igep00x0) to make them boot
> again.
> 
> Back then I also tested on a Beagleboard Rev. C4 since it has the 
> same ns16550 UART controller than the IGEPv2 as far as I 
> understood. I used the exact U-Boot version, USB-Serial cable,
> host PC and terminal emulation program that I used for the IGEPv2
> and the Beagleboard booted correctly. This is the same behavior
> that Tom had on his Beagleboard.
> 
> Since it worked on the Beagle I thought the issue was only present 
> on IGEP boards but now Manfred says that he has the same issue on 
> his Beagleboard. I now wonder if all IGEPv2 are broken or only my 
> board and the ones of the users that cared to report this and
> other IGEPv2 can boot without CONFIG_SYS_NS16550_BROKEN_TEMT.

Yeah, this is very perplexing.  I'm thinking we need to enable this
"quirk" for all of the "omap" platforms except for OMAP3_ZOOM (which
iirc has a different uart chip wired up rather than the SoC uart).

- -- 
Tom
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