[U-Boot] [PATCH 0/9] arm64: Unify MMU code

[Stephen Warren]

On 02/21/2016 06:57 PM, Alexander Graf wrote:
> Howdy,
>
> Currently on arm64 there is a big pile of mess when it comes to MMU
> support and page tables. Each board does its own little thing and the
> generic code is pretty dumb and nobody actually uses it.
>
> This patch set tries to clean that up. After this series is applied,
> all boards except for the FSL Layerscape ones are converted to the
> new generic page table logic and have icache+dcache enabled.
>
> The new code always uses 4k page size. It dynamically allocates 1G or
> 2M pages for ranges that fit. When a dcache attribute request comes in
> that requires a smaller granularity than our previous allocation could
> fulfill, pages get automatically split.
>
> I have tested and verified the code works on HiKey (bare metal),
> vexpress64 (Foundation Model) and zynqmp (QEMU). The TX1 target is
> untested, but given the simplicity of the maps I doubt it'll break.
> ThunderX in theory should also work, but I haven't tested it. I would
> be very happy if people with access to those system could give the patch
> set a try.
>
> With this we're a big step closer to a good base line for EFI payload
> support, since we can now just require that all boards always have dcache
> enabled.
>
> I would also be incredibly happy if some Freescale people could look
> at their MMU code and try to unify it into the now cleaned up generic
> code. I don't think we're far off here.

The series,
Tested-by: Stephen Warren <swarren at nvidia.com>

I tested p2371-2180 (Jetson TX1) ARMv8 development board, including 
PCIe-based RTL8169 Ethernet, which makes use of the APIs to 
allocate/convert memory as/to uncached.