Re: [Qemu-devel] [PATCH][SPARC] LEON3: Add emulation of AMBA plug&play

[Fabien Chouteau <chouteau@adacore.com>]

On 10/08/2014 09:43 PM, Jiri Gaisler wrote:
> On 10/08/2014 05:38 PM, Andreas Färber wrote:
>> Hi,
>>
>> Am 08.10.2014 um 16:19 schrieb Fabien Chouteau:
>>> From: Jiri Gaisler <jiri@gaisler.se>
>>>
>>> AMBA plug&play is used by kernels to probe available devices (Timers,
>>> UART, etc...). This is a static declaration of devices implemented in
>>> QEMU. In the future, a more advanced version could compute those
>>> information directly from the device tree.
>>
>> Interesting. There's quite some magic numbers in the read functions; I
>> wonder if you could read them via QOM if you actually give the devices a
>> canonical path or search by type? You may want to peek at ACPI code.
> 
> 
> The plug&play area is similar in function to the PCI configuration
> space, indicating vendor/device ID's, address range, interrupt number
> etc. of on-chip IP cores. The 'magic' numbers could be generated by
> generic functions taking these parameters as inputs. This would
> certainly make the code more readable, and easily extended in the
> future. Would such a solution be acceptable?
> 
> 

That would be a great improvement, then we could try to plug it with the
QOM API to generate automatically the data.