I have been running iwd on armv6 and v7 for a while without issue. I finally got an image or Arch aarch64 on my RPI running (kernel 5.4.44) and cannot start the already compiled for aarch64 version of iwd on this kernel. The journal shows this: Jun 18 23:34:02 rune64 systemd[1]: Starting Wireless service... Jun 18 23:34:03 rune64 iwd[4088]: No HMAC(SHA1) support found Jun 18 23:34:03 rune64 iwd[4088]: No HMAC(MD5) support found Jun 18 23:34:03 rune64 iwd[4088]: No CMAC(AES) support found Jun 18 23:34:03 rune64 iwd[4088]: No HMAC(SHA256) support not found Jun 18 23:34:03 rune64 iwd[4088]: No HMAC(SHA512) support found, certain TLS connections might fail Jun 18 23:34:03 rune64 iwd[4088]: No Diffie-Hellman support found, WPS will not be available Jun 18 23:34:03 rune64 iwd[4088]: The following options are missing in the kernel: Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_USER_API_HASH Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_KEY_DH_OPERATIONS Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_MD5 Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_SHA256 Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_AES Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_CMAC Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_USER_API_HASH Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_USER_API_HASH Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_USER_API_HASH Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_HMAC Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_HMAC Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_HMAC Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_SHA512 Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_SHA1 Jun 18 23:34:03 rune64 iwd[4088]: The following optimized implementations might be available: Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_SHA1_SSSE3 Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_AES_NI_INTEL Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_SHA512_SSSE3 Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_AES_X86_64 Jun 18 23:34:03 rune64 iwd[4088]: CONFIG_CRYPTO_SHA256_SSSE3 Jun 18 23:34:03 rune64 systemd[1]: iwd.service: Main process exited, code=exited, status=1/FAILURE Jun 18 23:34:03 rune64 systemd[1]: iwd.service: Failed with result 'exit-code'. Jun 18 23:34:03 rune64 systemd[1]: Failed to start Wireless service. I recently built this kernel on a system that was running 5.7.x and iwd 1.7.1 was also built on this kernel. When I run iwd on 5.7.x, it runs and functions. I checked the config and most of these appear as modules but are not built in. Must they be built in? Keith