Hi Peter Maydell, Thanks, that made it clearer to me.(actually I was reading the page you mentioned)
Chan Kim > -----Original Message----- > From: Peter Maydell <peter.mayd...@linaro.org> > Sent: Friday, February 19, 2021 7:04 PM > To: Chan Kim <c...@etri.re.kr> > Cc: Philippe Mathieu-Daudé <phi...@redhat.com>; qemu-discuss <qemu- > disc...@nongnu.org>; Paolo Bonzini <pbonz...@redhat.com>; qemu-devel > <qemu-devel@nongnu.org>; Markus Armbruster <arm...@redhat.com> > Subject: Re: supported machines for aarch64 > > On Fri, 19 Feb 2021 at 08:05, <c...@etri.re.kr> wrote: > > These are the machine lists that included cortex-a72 when I gave > > qemu-system-aarch64 --machine xxx --cpu help. > > Adding '--machine whatever' to your command line does not change the > output of '--cpu help'. As Philippe says, it happens that QEMU processes - > -cpu before --machine, so it handles '--cpu help', prints the fixed list > of supported CPUs, and ignores whether you passed a valid --machine option > or not. > > There is no automated way to get QEMU to tell you which CPUs a particular > board model supports. > > I recommend that you follow the advice given here > https://qemu.readthedocs.io/en/latest/system/target-arm.html#choosing-a- > board-model > for how to choose a board model. (Short answer: if you know you want to > run guest code for a specific board type, use that board type. Otherwise, > use 'virt'.) Then, you should stick with the default CPU type (ie, do not > pass --cpu) for that board, for all board types *except* 'virt'. For > 'virt' you can pass in the CPU type you want (and the documentation lists > which types it supports). > > -- PMM
