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Re: [PATCH for-4.14 0/3] Remove the 1GB limitation on Rasberry Pi 4

On 19/05/2020 04:08, Tamas K Lengyel wrote:
On Mon, May 18, 2020 at 5:32 AM Julien Grall <julien@xxxxxxx> wrote:

From: Julien Grall <jgrall@xxxxxxxxxx>

Hi all,

At the moment, a user who wants to boot Xen on the Raspberry Pi 4 can
only use the first GB of memory.

This is because several devices cannot DMA above 1GB but Xen doesn't
necessarily allocate memory for Dom0 below 1GB.

This small series is trying to address the problem by allowing a
platform to restrict where Dom0 banks are allocated.

This is also a candidate for Xen 4.14. Without it, a user will not be
able to use all the RAM on the Raspberry Pi 4.

This series has only be slighlty tested. I would appreciate more test on
the Rasbperry Pi 4 to confirm this removing the restriction.

Hi Julien,


could you post a git branch somewhere? I can try this on my rpi4 that
already runs 4.13.

I have pushed a branch based on unstable and the v2 of the series:


branch arm-dma/v2

Thank you in advance for the testing!


Julien Grall



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