On Tue, 30 Apr 2019 at 21:29, Alistair Francis <alistai...@gmail.com> wrote: > > On Tue, Apr 30, 2019 at 9:02 AM Peter Maydell <peter.mayd...@linaro.org> > wrote: > > Can you explain the purpose of the reset code? None of the other > > v7m boards seem to need to do a manual qemu_register_reset(). > > The reset code allows the machine to work with the -kernel option. > Without the reset override using -kernel results in the guest starting > at the wrong address. We can use the -device loader option without the > reset code though.
That sounds in line with how -kernel works on the other armv7m boards -- the expectation is that your image file includes a full vector table and the CPU will read the PC and SP from it when it resets. If you want "honour the entry point" you can use -device loader, as you say. Ignoring the entry point for -kernel ELF files is certainly a bit confusing, but I think if we want to change this we should do it globally, rather than having one board which behaves differently to the rest. Changing it does have some awkwardness: * possibility of breaking previously working images * we can get the initial PC from the ELF entrypoint, but if we do this what do we do about the initial SP value ? thanks -- PMM
