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

[Konrad Dybcio]

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?

Konrad