RPi4 can't deal with 64 bit PCI accesses

[Russell King - ARM Linux admin]

On Mon, Feb 22, 2021 at 04:47:22PM +0100, Nicolas Saenz Julienne wrote:
> [2] Things might get even weirder as the order in which the 32bit operations
>     are performed might matter (low/high vs high/low).

Note that arm32 does not provide writeq() very purposely because it
is device specific whether writing high-then-low or low-then-high is
the correct approach. See linux/io-64-nonatomic-*.h

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