[U-Boot] [PATCH] vexpress64: Juno: Change PCI buss addresses for IO to start from zero.

[Ryan Harkin]

On 22 November 2016 at 15:08, Tom Rini <trini at konsulko.com> wrote:
> On Tue, Nov 22, 2016 at 12:08:49PM +0000, Liviu Dudau wrote:
>> On Tue, Nov 22, 2016 at 11:29:20AM +0000, Sudeep Holla wrote:
>> > Hi Liviu,
>> >
>> > On Tue, Nov 22, 2016 at 11:19 AM, Liviu Dudau <Liviu.Dudau at foss.arm.com> wrote:
>> > > Juno uses a 1:1 mapping between CPU and PCI addresses for IO. First,
>> > > that will trip devices that cannot use more than 16 bits of addresses
>> > > for IO, second it is un-necessary as the system can handle zero-based
>> > > PCI addresses just fine.
>> > >
>> > > Change the mapping to start IO bus addresses from zero.
>> > >
>> >
>> > I assume this require corresponding DT change, shout if that's not true.
>> > If that's true, then does this patch not require patching of DT so
>> > that systems not
>> > running Uboot with this patch continue to work and we retain the
>> > mainline DT as is ?
>>
>> Yes, it does require DT changes, Jeremy Linton has a patch
>
> So to be clear, what level of coordination do we need between the two
> parts being merged?  It would not be ideal to have combinations of
> U-Boot and Linux not work.  Thanks!
>

I was wondering that too.

However, I just tested the patch in my setup and everything still
seems to work for me.  I'll admit though that I only use the PCIe
network port, I don't have any extra PCIe devices and don't use SATA
drives in my setup.


> --
> Tom
>
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