Let’s take this topic to the Tech Forum.

Personally, I’d prefer using prebuilt binaries in tf-m-tests and avoiding fetching the CMSIS repo if possible since it’s quite heavy.

As I recall several RTX binary configurations are needed to cover different compiler options.

Thanks,

Anton

From: Nicola Mazzucato via TF-M <tf-m@lists.trustedfirmware.org>
Sent: Thursday, February 26, 2026 5:08 PM
To: Antonio De Angelis <Antonio.DeAngelis@arm.com>; Bohdan.Hunko@infineon.com; tf-m@lists.trustedfirmware.org; David Hazi <David.Hazi@arm.com>
Cc: nd <nd@arm.com>
Subject: [TF-M] Re: Short enums and short wchar

I rebuilt RTX not long ago and was not very difficult.

Though I did not change the flags, we my need to look into that.

It's also possible that TF-M could benefit from a more up-to-date version of RTX.

Not sure what others think.

Maybe a discussion topic for the next Tech Forum?

Thanks

Nick

---

From: David Hazi via TF-M <tf-m@lists.trustedfirmware.org>
Sent: 26 February 2026 16:24
To: Antonio De Angelis <Antonio.DeAngelis@arm.com>; Bohdan.Hunko@infineon.com <Bohdan.Hunko@infineon.com>; tf-m@lists.trustedfirmware.org <tf-m@lists.trustedfirmware.org>
Cc: nd <nd@arm.com>
Subject: [TF-M] Re: Short enums and short wchar

Hi all,

https://github.com/ARM-software/CMSIS-RTX/releases/tag/v5.9.1

Prebuilt images are in the RTX_Lib.tar.bz2 file.

There were discussions about switching to FreeRTOS, is this still an option?

Dávid

From: Antonio De Angelis via TF-M <tf-m@lists.trustedfirmware.org>
Date: Thursday, 2026. February 26. at 17:22
To: Bohdan.Hunko@infineon.com <Bohdan.Hunko@infineon.com>, tf-m@lists.trustedfirmware.org <tf-m@lists.trustedfirmware.org>
Cc: nd <nd@arm.com>
Subject: [TF-M] Re: Short enums and short wchar

Hi Bohdan,

Prebuilt RTX libraries were provided by the CMSIS project but I believe that now they have stopped distributing them. Using the prebuilt libraries at the beginning of TF-M was just a practical choice, I’d very much welcome a contribution to build RTX from source as part of the NS code. Do you think you can work towards that? Currently our bandwidth is limited to spend some engineering time on that but would very much appreciate any contributions.

Thanks,

Antonio

Sent from Outlook for Mac

From: Bohdan.Hunko--- via TF-M <tf-m@lists.trustedfirmware.org>
Date: Thursday, 26 February 2026 at 15:58
To: tf-m@lists.trustedfirmware.org <tf-m@lists.trustedfirmware.org>
Subject: [TF-M] Short enums and short wchar

Hi all,

Currently TFM specifies -fshort-wchar and -fshort-enums

There previously was a discussion about this in https://lists.trustedfirmware.org/archives/list/tf-m@lists.trustedfirmware.org/thread/HCUXA72SZHSCXIEJSMH4RACJLMOXAQC6/

The decision was to remove these flags – which was done in https://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/6186

But then fix was reverted in https://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/6349 because:

 Removing the -fshort-wchar flag will cause link error with

                    RTX library while using armclang and debug mode.

Now we faced same issue when linking some of our prebuilt crypto libraries.

Since RTX libraries ware prebuilt by TFM maintainers (prebuilt RTX libs are not part of CMSIS RTX) – I believe it is better to rebuild them without -fshort-wchar and -fshort-enums and remove these flags in TFM.

Does TFM team still have a possibility to rebuild these RTX libs? Does this change make sense to TFM community?

Best regards,

Bohdan Hunko

Cypress Semiconductor Ukraine LLC

Senior Engineer

CSS ICW SW INT BFS SFW

Mobile: +380995019714
Bohdan.Hunko@infineon.com