[U-Boot] [PATCH 00/10] arm64: Unify MMU code

[Alexander Graf]

> Am 24.02.2016 um 13:19 schrieb Michal Simek <michal.simek at xilinx.com>:
> 
>> On 24.2.2016 13:11, 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.
>> 
>> 
>> Alex
>> 
>> v1 -> v2:
>> 
>>  - Fix comment for create_table()
>>  - Rework page table size calculation
>>  - Move mmu tables into board files
>>  - New patch: thunderx: Move mmu table into board file
> 
> You miss v2 in subject.

Yeah, I realized that 2 seconds after I sent the mails out, but figured I'd not spam everyone just to admit I did something stupid ;).

The rest still stands, testing and review are both greatly appreciated.


Alex