On Thursday 07 April 2016, Al Stone wrote:
> >>> config DEVPORT
> >>> bool
> >>> - depends on !M68K
> >>> + depends on !M68K && !ARM64
> >>
> >> Why not fix the real bug here, it's odd that only these two arches need
> >> this disabled, don't you agree?
>
> Agreed. It does seem odd. I'm not sure I understand which bug you're
> thinking
> is the real one, though -- that DEVPORT should be disabled in all places that
> don't have ISA or that arm64 needs to have /dev/port work properly? Or
> perhaps
> I missed something else entirely...
We've had a similar problem recently with ISA drivers crashing when no PCI
host registers itself for the first 0x1000 I/O port addresses.
I think both the request_resource() function and /dev/ioport should be
changed to interface with the dynamic registration of I/O port ranges
so they only ever allow access on ports that are mapped into virtual memory.
Arnd
