[PATCH 6/8] arm: mach-armada: add support for Armada XP board with device tree

Le Tue, 15 May 2012 15:32:20 +0000,
Arnd Bergmann [off-list ref] a ?crit :

quoted

quoted

Agreed. When looking at the code, I wasn't sure why PCI mappings
were needed so early. Surely, the minimal mappings to get an UART
are quite useful to have very early, but why PCI?

I think it was because that PCI was initialised early and requires a
large mapping space. It is very likely to be legacy kernel stuff
that people have kept copying through.

No, as Rob pointed out, we might not need them early, but we
definitely want a fixed address for the PIO window, which ioremap
does not provide.

A fixed address for the PIO window of the PCI registers? Or a fixed
address for the PIO window used to access UART registers?

I would understand why a fixed address is needed for the latter, but
not really for the former.

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com