Re: [PATCH v6 6/6] pci: Add support for creating a generic host_bridge from device tree

Geert Uytterhoeven
2014-03-10T19:16:29Z

On Mon, Mar 10, 2014 at 7:59 PM, Arnd Bergmann <arnd@arndb.de> wrote:
>> arch/avr32/include/asm/io.h:#define IO_SPACE_LIMIT 0xffffffff
>> arch/frv/include/asm/io.h:#define IO_SPACE_LIMIT 0xffffffff
>
> They have no MMU, and the code relies on the port number to match
> both the virtual and the physical address. You could be right about
> these, but I would guess that the code also needs some other
> changes if we want to make it work on nommu kernels. It also depends
> on whether the I/O bus address is the same as the CPU address, or
> if it starts at bus address 0.

>> arch/m68k/include/asm/io_no.h:#define IO_SPACE_LIMIT 0xffffffff
>
> This looks like a mistake, it should be smaller

io_no.h is for nommu.

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds