Re: Virt MM DEBUG_LL support arm32

[Mario Smarduch <m.smarduch@samsung.com>]

On 10/7/2015 12:07 AM, Peter Maydell wrote:
> On 7 October 2015 at 01:32, Mario Smarduch <m.smarduch@samsung.com> wrote:
>> Hi Peter,
>>    I noticed that icedcc, and 8250 don't work
>> with DEBUG_LL early debug print. And the kernel dies if
>> these are selected. Besides PL011 is there any other
>> serial devices that can be used for early debug with Virt MM?
>> Maybe some additional options are needed?
> 
> PL011 and semihosting are the obvious choices for early
> debug output. There's no 8250 in the virt board so that
> definitely isn't going to work. We don't currently implement
> the ICE DCC channel, though I think Edgar was considering
> connecting it up to a chardev backend.
> 
> Really though, I think the UART and semihosting should
> be enough for whatever the guest wants to do in the way
> of early debug. Why do you need more options?
> 
> thanks
> -- PMM
> 

No actually I was thinking of limiting choices to the ones that work for
Virt MM during kernel config. But thought that maybe others may be
supported through some options. Form me PL011 alone is enough.

- Mario