Re: [PATCH 0/1] Initial ARMv7-A LPAE support

[Sascha Hauer <s.hauer@pengutronix.de>]

On Mon, Feb 23, 2026 at 12:44:23PM +0100, Ahmad Fatoum wrote:
> Hello Sascha,
> 
> On 2/23/26 12:40 PM, Sascha Hauer wrote:
> > Hi Renaud,
> > 
> > On Tue, Feb 03, 2026 at 02:19:44PM +0000, Renaud Barbier wrote:
> >> The LPAE support allows to map physical address above the 32-bit space in
> >> the ARMv7-A processor to a 32-bit virtual address.
> >>
> >> This patch set was tested on a LS1021A-IOT. Later, a patch to the PCIe
> >> designware driver will be provided to prove the remapping of 40-bit PA to
> >> 32-bit VA.
> >>
> >> This patch does not include an update of the mmuinfo command.
> >>
> >> Renaud Barbier (1):
> >>   arm: mmu: initial LPAE support
> >>
> >>  arch/arm/Kconfig                            |   9 +
> >>  arch/arm/configs/layerscape_v7_defconfig    |   1 +
> >>  arch/arm/cpu/Makefile                       |   4 +
> >>  arch/arm/cpu/mmu_lpae.c                     | 650 ++++++++++++++++++++
> >>  arch/arm/cpu/mmu_lpae.h                     | 101 +++
> > 
> > The patch duplicates most of the existing MMU support. Can we do better?
> 
> I had asked for it in this form, so I can get a look at how much
> duplication there is and how to go from there.
> 
> I haven't come around yet to review it though, but I will try to find
> the time soon.

Ah, ok. Makes sense.

Sascha

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