[U-Boot] [PATCH] ns16550: allow UART address to be set dynamically

[Tom Rini]

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On 12/13/12 16:51, Simon Glass wrote:

[snip]
>>> And from there we can move on and say "On ${SoC} we get a
>>> device tree (that we can't quite parse as we don't have enough
>>> resources) AND $some-data (OMDATA or an abbreviated device tree
>>> or $whatever), lets translate that into something we can make
>>> use of very early rather than a hard-coded initial console
>>> location"
>> 
>> It seems like you're saying that once we have dynamic serial
>> port assignment working based on DT, you'll be fine using ODMDATA
>> to initialize the early console, but not before then? If so, I'm
>> having a hard time understanding why enabling the DT-based
>> support blocks using ODMDATA, since the code would be pretty
>> orthogonal.
> 
> Yes well dynamic console selection sounds find to me, ODMDATA or 
> otherwise. To me it is a Tegra feature that should be supported as 
> such. Perhaps we can allow the FDT console alias to specify
> "odmdata" to mean that, and/or (as you suggest I think) set the
> console to USE_ODMDATA, which then selects CONFIG_SYS_NS16550_COMx
> accordingly.

There's two parts to it.  One part is that sure, Tegra and only Tegra
has ODMDATA.  But on am33xx if we poke the i2c eeprom (on platforms
that do the eeprom) we can then know ...  And I bet other SoCs have
other tricks for this or that.  So it's not just tegra that can tell
us the initial console is $here or $there if we just ...something.

The other part is, take a look at the Allwinner thread from a week or
so ago.  We really need to define how we want early board specific
data to come in because if we start saying we'll accept per-SoC
solutions we'll be drowning in them in short time.  We want to say
here's our preferred way to pass this information in.

- -- 
Tom
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