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

[Mukesh Ojha]

On Wed, Jul 01, 2026 at 02:26:11PM +0200, Konrad Dybcio wrote:
> On 6/30/26 8:30 AM, Mukesh Ojha wrote:
> > On Mon, Jun 29, 2026 at 04:08:26PM +0200, Konrad Dybcio wrote:
> >> On 6/29/26 2:22 PM, Mukesh Ojha wrote:
> >>> 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.
> >>
> >> Right, I'm asking about it usefulness on devices *with* Gunyah
> > 
> > Ideally, it does not need to be mentioned in the OS device tree when
> > Gunyah is present as there is no user in OS..
> 
> But it's also reserved (in the UEFI map), right?

This is device memory and not a normal memory.

-- 
-Mukesh Ojha