On Thu, Mar 1, 2018 at 11:30 PM, Patrick Rudolph < patrick.rudo...@9elements.com> wrote:
> Am Donnerstag, den 01.03.2018, 14:11 -0800 schrieb Julius Werner: > > Hi Patrick et. al., > > > > Continuing from what you said on IRC, let's please discuss this > > before you spend time to work on any major changes to the ARMv8 MMU > > code. I don't think that should be necessary (especially changing the > > GRANULE_SIZE which is a complication I'd really like to avoid > > having), and I'd like to understand what you're trying to do first. > > Can you explain what memory ranges you need to map on your SoC and > > why they need to be so large? > > > Hi Julius, > the Cavium SoC expose the MMIO space at 1 << 47 with a size of 1 << 47. > As coreboot does use PA=VA mapping, I have to extend the VA space to 48 > bit and that seems to work fine with 64KB granule. > > The change in coreboot is minimal, I'm not sure if all armv8 CPUs > support's that granule, but a Kconfig should do for now. > Yes, the architecture reference manual for ARMv8 mentions that 4KB, 16KB, and 64KB are supported for VMSAv8-64.
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