On Friday 30 November 2012, Eli Billauer wrote:
> The problem is if the page size smaller than 4kB. The buffers
> allocated by the driver must not cross a 4kB boundary, and it's assumed
> that anything returned by __get_free_pages() is 4 kB-aligned. Otherwise
> the FPGA will generate illegal PCIe packets by crossing that boundary.
>
> If the page boundary is bigger than 4k, the driver handles that well.
>
That should be fine then. We don't really support running Linux on
systems with a page size smaller than 4KB anyway, and I think the
only ones that ever hard smaller hardware page sizes (iirc m68k
or vax) were emulating 4KB pages in software.
Arnd
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