Cannot get Eddystone example to compile SDK15 pca10040e

[Antonio]

I am using Keil 5.24.2

I already downloaded and compiled with build_all the micro_ecc. Having no issues here.

According to the error, and what I read in another thread, the FP flag in the library must be on. This is happening also if I compile the example from SDK 14.2.0. I suspect that having installed the new MDK 8.16.0 is causing this.

How can I fix it?

Thanks!!!

.\_build\nrf52810_xxaa.axf: Error: L6366E: occ_mod25519_base.s.obj attributes are not compatible with the provided attributes .
Object occ_mod25519_base.s.obj contains Build Attributes that are incompatible with the provided attributes.
Tag_FP_arch = VFPv4 instructions were permitted, but only citing registers D0-D15 (=6)
Tag_ABI_HardFP_use = This code should execute on the single-precision variant derived from Tag_FP_arch (=1)
Tag_FP_HP_extension = Use of the optional half-precision extension to VFPv3/Advanced SIMDv1 was permitted (=1)
.\_build\nrf52810_xxaa.axf: Error: L6366E: occ_bigint256.s.obj attributes are not compatible with the provided attributes .
Object occ_bigint256.s.obj contains Build Attributes that are incompatible with the provided attributes.
Tag_FP_arch = VFPv4 instructions were permitted, but only citing registers D0-D15 (=6)
Tag_ABI_HardFP_use = This code should execute on the single-precision variant derived from Tag_FP_arch (=1)
Tag_FP_HP_extension = Use of the optional half-precision extension to VFPv3/Advanced SIMDv1 was permitted (=1)
.\_build\nrf52810_xxaa.axf: Error: L6366E: occ_constant_time.s.obj attributes are not compatible with the provided attributes .
Object occ_constant_time.s.obj contains Build Attributes that are incompatible with the provided attributes.
Tag_FP_arch = VFPv4 instructions were permitted, but only citing registers D0-D15 (=6)
Tag_ABI_HardFP_use = This code should execute on the single-precision variant derived from Tag_FP_arch (=1)
Tag_FP_HP_extension = Use of the optional half-precision extension to VFPv3/Advanced SIMDv1 was permitted (=1)

[Bjørn Kvaale]

That could be the case. I did not get any errors once I installed the micro-ecc like explained in this link. Did you make micro_ecc like shown in the link? I am using Keil uVision V5.24.2.0 & everything worked without any issues at all.

Update: It seems I made an error before & did not compile the 10040e example like I thought I did. When I try compiling the Eddystone example pca10040e, I get this error when the linking occurs:

We believe it has something to do with the Oberon-cryptography library. Will let you know when we figure this out.

[Antonio]

Thank you. I also think it has to do something with the library being precompiled with the FP flag on, which conflicts with the actual project not using the HW FP.

[Bjørn Kvaale]

A colleague of mine has found that the problem is related to the assembly lines in the Oberon crypto library that use floating point instructions. A bug fix has been reported & we will let you know when we have a fix.

[Antonio]

Is there a way to use another library meanwhile? (uECC?). I tried disabling the library OBERON and tuning on uECC, but there is a function in the es_security file that depends on nrf_crypto_ecc_public_key_from_raw being called from the es_security_client_pub_ecdh_receive function.