On Tue, 4 Feb 2025 at 13:40, Philippe Mathieu-Daudé <philmd@linaro.org> wrote:
On 4/2/25 12:13, Peter Maydell wrote:
On Tue, 4 Feb 2025 at 09:57, Daniel P. Berrangé <berrange@redhat.com> wrote:
IMHO we can have distinct machines for each model, but *NOT* have further machines for each RAM size within a model.
Yes, this was what I was intending to suggest. Apologies if I was confusing with what I said the previous time round.
OK, let's see if we understand each other correctly as developer, before explaining to users, taking the 4B model as example.
The 4B come in 4 physical variants, depending on the amount of DRAM: 1G, 2G, 4G and 8G.
We can not allocate 2G on 32-bit hosts, so to have a reproducible guest behavior on 32/64-bit hosts, it makes sense to takes the model with 1G of DRAM as default for the 'raspi4b' machine.
At the moment we create the 1GB version on 32-bit hosts and the 2GB version on 64-bit hosts. I dunno that that's ideal, but I think it's probably best not to change that at this point.
If an user specify -m 2G ... 8G, we can adapt the 'board_rev' register to expose the corresponding amount of ram. Now, how / where to tell the users 1/ the default is 1G, and 2/ they can use 2/4/8G?
In the documentation: docs/system/arm/raspi.rst . -- PMM