If there is time, I would like to discuss the automatic generation of Xen passthrough device tree config files using lopper.

On Thu, 5 May 2022, Nathalie Chan King Choy wrote:

• Anirudha whose team worked on bare metal assist

I’ve forwarded the call invitation to Anirudha, Alexandre & Valentin

From: Loic PALLARDY loic.pallardy@st.com Sent: Thursday, May 5, 2022 6:26 AM To: Nathalie Chan King Choy nathalie@xilinx.com; Stefano Stabellini stefanos@xilinx.com; Bruce Ashfield brucea@xilinx.com; Bill Mills bill.mills@linaro.org; Arnaud POULIQUEN arnaud.pouliquen@st.com; Bolivar, Marti Marti.Bolivar@nordicsemi.no; 'system-dt@lists.openampproject.org' system-dt@lists.openampproject.org Cc: Alexandre TORGUE alexandre.torgue@st.com; Valentin CARON valentin.caron@st.com Subject: RE: Calling for agenda: 2022-05-10 System Device Tree - Lopper

Hi Nathalie,

We would like to discuss a generic way to transform dts file in c-struct for baremetal/rtos environment.

An initial lopper assist is under development on ST side and we would like to get feedbacks and see it is possible to have some synergies with other projects.

Regards,

Loic

ST Restricted

From: Nathalie Chan King Choy nathalie@xilinx.com Sent: Thursday, May 5, 2022 12:25 AM To: Stefano Stabellini stefanos@xilinx.com; Bruce Ashfield brucea@xilinx.com; Bill Mills bill.mills@linaro.org; Loic PALLARDY loic.pallardy@st.com; Arnaud POULIQUEN arnaud.pouliquen@st.com; Bolivar, Marti Marti.Bolivar@nordicsemi.no; 'system-dt@lists.openampproject.org' system-dt@lists.openampproject.org Subject: Calling for agenda: 2022-05-10 System Device Tree - Lopper

Hi all,

Please let us know your requests for Lopper-specific topics for next Tuesday’s call.

Thanks & regards,

Nathalie

-----Original Appointment----- From: Nathalie Chan King Choy Sent: Friday, April 29, 2022 8:44 AM To: Nathalie Chan King Choy; Stefano Stabellini; Bruce Ashfield; Bill Mills; Loic PALLARDY; Arnaud POULIQUEN; Bolivar, Marti; 'system-dt@lists.openampproject.org' Cc: Andrew Wafaa; christopher.w.clark@gmail.com; Tanmay Shah; Felix Burton; Sudeep Holla; joakim.bech@linaro.org; Tomas Evensen Subject: System Device Tree - Lopper When: Tuesday, May 10, 2022 8:00 AM-9:00 AM (UTC-08:00) Pacific Time (US & Canada). Where: https://xilinx.zoom.us/j/96170643686?pwd=VWViYTdLZFpQK1Zac0U0S3dJQy9rdz09&am...

Hi all,

At the OpenAMP TSC, we discussed having a Lopper-focused call in early May.

Notes from the previous System DT call https://github.com/OpenAMP/open-amp/wiki/System-Device-Tree-Meeting-Notes-20...

For system-dt mailing list archives, and to subscribe/unsubscribe someone:

https://lists.openampproject.org/mailman3/lists/system-dt.lists.openampproje...

Thanks & regards,

Nathalie

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On Thu, May 5, 2022 at 8:26 AM Loic PALLARDY via System-dt system-dt@lists.openampproject.org wrote:

Hi Nathalie,

We would like to discuss a generic way to transform dts file in c-struct for baremetal/rtos environment.

My suggestion would be to use the DT schema. The flow would be something like this:

dts---------------->dtb---------+-->C struct declarations | schemas-->C struct definitions--+

The information is all there in the schemas. It's used to decode byte arrays in dtbs into the appropriate types for schema validation. Patterns with '#*-cells' need some code to handle if you want to split the entries (i.e. anything more than an array of u32's). Not really any way around that.

While dts files (may) have some amount of type information in them, having been down the path of using that, I would not recommend any solution doing that. Any type information may not be there to begin with and it's lost in any processing whether that's the dtb file or a dts to dts pass.

Rob