Re: [PATCH v8] arm64: dts: qcom: kodiak: Add EL2 overlay

[Mukesh Ojha]

On Mon, Jun 29, 2026 at 01:36:34PM +0200, Konrad Dybcio wrote:
> On 6/25/26 3:14 AM, Miaoqing Pan wrote:
> > 
> > 
> > On 6/24/2026 2:39 PM, Mukesh Ojha wrote:
> >> All the existing variants Kodiak boards are using Gunyah hypervisor
> >> which means that, so far, Linux-based OS could only boot in EL1 on those
> >> devices.  However, it is possible for us to boot Linux at EL2 on these
> >> devices [1].
> 
> [...]
> 
> > Is it necessary to redefine |wlan_ce_mem|? Can we consider updating |qcs6490-rb3gen2.dts|?
> > I have verified that with the following changes, *NON-KVM works fine*, and |wlan_ce_mem| is only used by the WCN6750 firmware.
> 
> Is there a good reason non-chrome devices never defined that region in
> the first place?

This region is needed by WPSS and non-Chrome (Gunyah) has IOMMU
control, maps it for WPSS during boot up while Linux at EL2 needs
to map it for WPSS in Gunyah's absence.

> 
> My guess-understanding is that UEFI allocates a region for it on
> Qualcomm platforms already, and if unspecified, we reserve memory
> again, wherever the allocator decides to
> 
> is that roughly right?
> 
> Konrad

-- 
-Mukesh Ojha