Re: [Xen-devel] [RFC 18/29] xen/arm: add generic UART to get the device in the device tree

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 04/30/2013 01:41 PM, Ian Campbell wrote:

> 
> 
>>         Couldn't it also hardcode a call to a "is this a dt serial
>>         alias"
>>         function?
>>
>>
>> Indeed. Can we assume Xen on Arm will use only one UART? We can modify
>> the behaviour later.
> 
> This seems acceptable to me.
>>  
>>         > If I understand your suggestion, you suggest to use
>>         console=myserial
>>         > where *myserial* is the alias on the DTB, right?
>>         
>>         
>>         Right.
>>         
>>         > In this case the name could clash with the hardcoded ones in
>>         Xen that is not good.
>>         
>>         
>>         console=dt:<alias> ? Or to be honest I'm not sure that having
>>         the dt
>>         aliases shadow the Xen hardcoded ones would be a bad thing --
>>         the x86
>>         centric com<X> definition hardcoded in Xen is hardly likely to
>>         be useful
>>         on ARM or any DT using platform.
>>
>>
>> I prefer dt:<alias> but how do we parse the configuration for the
>> UART?
>>
>> Do we use dt:<alias>=configuration on the command line? In this case
>> I don't see function to retrieve a non-defined parameters on the
>> command line.
> 
> Hrm, yes.
> 
> Perhaps dtuart=, applied to whichever dt:<alias> you choose?
> 
>> We should also take care about video card. In the future, the devices
>> will be retrieved from the DTS.
> 
> In that case perhaps: console=dtuart:<alias> and =dtfb:<alias>?


Sounds good for me. I will rework the patch with that.

-- 
Julien

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