On Tue, 4 Feb 2025 at 13:40, Philippe Mathieu-Daudé <philmd@xxxxxxxxxx> wrote: > > On 4/2/25 12:13, Peter Maydell wrote: > > On Tue, 4 Feb 2025 at 09:57, Daniel P. Berrangé <berrange@xxxxxxxxxx> 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
