Re: [Qemu-arm] [Qemu-devel] [RFC 0/2] ARM virt: Support up to 256 PCIe buses

[Laszlo Ersek]

On 05/23/18 22:40, Auger Eric wrote:
> On 05/23/2018 07:45 PM, Laszlo Ersek wrote:

>> Regarding the second patch, I do believe we need "more sophistication"
>> there. For example, I guess it could be possible to distinguish "-cpu
>> cortex-a15" from "-cpu cortex-a57" somehow, and stick with the low/small
>> ECAM in the former case. (The 32-bit firmware already runs on cortex-a15
>> only, and not on cortex-a57, according to my testing.)
> 
> So we should detect we are in ACPI boot  + aarch32 mode to force legacy
> ECAM region, right?

Agree about the aarch32 subcondition.

However, "ACPI vs. DT" is not the right "other" subcondition here;
instead we should (minimally) check "firmware vs. no firmware". See the
"firmware_loaded" boolean field.

I also suggest waiting for feedback from others! :)

Thanks,
Laszlo