Re: [Xen-devel] [PATCH 0/2] Fix Xen boot on XGene

[Julien Grall <julien.grall@xxxxxxxxx>]

Hi,

Apologize for not respecting the netiquette.

On Tue, 25 Oct 2016, 5:49 p.m. Stefano Stabellini, <sstabellini@xxxxxxxxxx> wrote:

Hi all,

the following commit:

commit 21550029f709072aacf3b90edd574e7d3021b400
Author: Julien Grall <julien.grall@xxxxxxxxxx>
Date:   Thu Oct 8 19:23:53 2015 +0100

    xen/arm: gic-v2: Automatically detect aliased GIC400


removed PLATFORM_QUIRK_GIC_64K_STRIDE and introduced an heuristic to
check whether the two GICC pages have a 64K stride. However the
heuristic needs device tree to report a GICC region size of 128K to work
properly. That is not the case for some versions of XGene (including the
one I am using, kindly provided by CloudLab.us).

The patch series fixes the issue by reintroducing platform quirks,
PLATFORM_QUIRK_GIC_64K_STRIDE, and forcing GICC size to 128K if
PLATFORM_QUIRK_GIC_64K_STRIDE.

We should consider this series for 4.8.

The platform you are using has likely a buggy firmware (I cannot find the mail from APM stating that).

I am not convinced that we should support a such case. IIRC unmodified Linux will not work properly on those platform (e.g the GIC will be drived as a GICv1).

Cheers,

-- 

Julien Grall

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