Re: [PATCH v8 0/5] Mac Old World ROM experiment (ppc/mac_* clean ups and loading binary ROM)

[Philippe Mathieu-Daudé]

On 10/16/20 11:58 AM, Mark Cave-Ayland wrote:
> On 16/10/2020 00:47, BALATON Zoltan via wrote:
>
> > This is the cut down version of the earlier series omitting unfinished
> > patches that I plan to rework later and rebased to Mark's qemu-macppc
> > branch. Compared to v7 the only change is the cast to (target_ulong)
> > from (uint32_t) as requested by Mark in patch 1.
>
> FWIW the reason for suggesting the cast to target_ulong is so that the 
> same code works for both qemu-system-ppc and qemu-system-ppc64. For 
> qemu-system-ppc that should correctly drop the sign extension from 
> 32-bit, whilst still allowing someone to load a 64-bit ELF into 
> qemu-system-ppc64 if requested.

IMO this is part of a bigger design problem. Not all
machines main bus is 64-bit. I did some experiments
but changing that involves a lot of work.