TLS based WPA-Enterprise authentication methods on kernel 4.19

Hello,

I'm running Linux kernel 4.19.231 (embedded, Buildroot build system) and when starting IWD I see the following message:

Jan 10 19:13:39 cm1sd systemd[1]: Starting Wireless service...
Jan 10 19:13:40 cm1sd iwd[1537]: No asymmetric key support found.
Jan 10 19:13:40 cm1sd iwd[1537]: TLS based WPA-Enterprise authentication methods will not function.
Jan 10 19:13:40 cm1sd iwd[1537]: Kernel 4.20+ is required for this feature.
Jan 10 19:13:40 cm1sd iwd[1537]: The following options are missing in the kernel:
Jan 10 19:13:40 cm1sd iwd[1537]:         CONFIG_ASYMMETRIC_KEY_TYPE
Jan 10 19:13:40 cm1sd iwd[1537]:         CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE
Jan 10 19:13:40 cm1sd iwd[1537]:         CONFIG_PKCS7_MESSAGE_PARSER
Jan 10 19:13:40 cm1sd iwd[1537]:         CONFIG_X509_CERTIFICATE_PARSER
Jan 10 19:13:40 cm1sd iwd[1537]:         CONFIG_PKCS8_PRIVATE_KEY_PARSER
Jan 10 19:13:40 cm1sd iwd[1537]: Wireless daemon version 2.17

My kernel has many backports and all of the listed options exist and are enabled.

> ag 'ASYMMETRIC_KEY|ASYMMETRIC_PUBLIC_KEY|PKCS7_MESSAGE|X509_CERTIFICATE|PKCS8_PRIVATE_KEY' ./buildroot/buildroot/output/cm1sd/build/linux-custom/.config
2475:CONFIG_ASYMMETRIC_KEY_TYPE=y
2476:CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE=y
2477:CONFIG_X509_CERTIFICATE_PARSER=y
2478:CONFIG_PKCS8_PRIVATE_KEY_PARSER=y
2479:CONFIG_PKCS7_MESSAGE_PARSER=y

Even though my 4.19 kernel appears to have the required options I still see this error about missing features.
Are there additional features that are required but not getting listed?

Thanks,

Michael John
Midmark Corporation

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