diff --git a/.github/workflows/tests_archdetect.yml b/.github/workflows/tests_archdetect.yml
index f5b42b3d55..860efb57d4 100644
--- a/.github/workflows/tests_archdetect.yml
+++ b/.github/workflows/tests_archdetect.yml
@@ -18,6 +18,7 @@ jobs:
           - x86_64/amd/zen3/Azure-CentOS7-7V73X
           - x86_64/amd/zen4/Azure-Alma8-9V33X
           - x86_64/amd/zen4/Shinx-RHEL8-9654
+          - aarch64/a64fx/Deucalion-Rocky85
           - aarch64/neoverse_n1/Azure-Ubuntu20-Altra
           - aarch64/neoverse_n1/AWS-awslinux-graviton2
           - aarch64/neoverse_v1/AWS-awslinux-graviton3
diff --git a/init/arch_specs/eessi_arch_arm.spec b/init/arch_specs/eessi_arch_arm.spec
index 8c1bc34d20..c0d74bd4ad 100755
--- a/init/arch_specs/eessi_arch_arm.spec
+++ b/init/arch_specs/eessi_arch_arm.spec
@@ -1,6 +1,9 @@
 # ARM CPU architecture specifications (see https://gpages.juszkiewicz.com.pl/arm-socs-table/arm-socs.html for guidance)
-# Software path in EESSI 	| Vendor ID 	| List of defining CPU features
+# CPU implementers: 0x41 (ARM), 0x46 (Fujitsu) - also see https://github.com/hrw/arm-socs-table/blob/main/data/socs.yml
+
+# Software path in EESSI 	| 'Vendor ID' or 'CPU implementer' 	| List of defining CPU features
+"aarch64/a64fx"		"0x46"		"asimdhp sve"		# Fujitsu A64FX
 "aarch64/neoverse_n1"	"ARM"		"asimddp"		# Ampere Altra
-"aarch64/neoverse_n1"	""		"asimddp"		# AWS Graviton2
+"aarch64/neoverse_n1"	"0x41"		"asimddp"		# AWS Graviton2
 "aarch64/neoverse_v1"	"ARM"		"asimddp svei8mm"
-"aarch64/neoverse_v1"	""		"asimddp svei8mm"	# AWS Graviton3
+"aarch64/neoverse_v1"	"0x41"		"asimddp svei8mm"	# AWS Graviton3
diff --git a/init/eessi_archdetect.sh b/init/eessi_archdetect.sh
index 2b1534ce62..4fd979cea5 100755
--- a/init/eessi_archdetect.sh
+++ b/init/eessi_archdetect.sh
@@ -111,16 +111,27 @@ cpupath(){
     update_arch_specs "$base_dir/arch_specs/${spec_file}"
   
     # Identify the host CPU vendor
-    local cpu_vendor_tag="vendor[ _]id"
-    local cpu_vendor=$(get_cpuinfo "$cpu_vendor_tag")
+    local cpu_vendor=$(get_cpuinfo "vendor[ _]id")
+    if [ "${cpu_vendor}" == "" ]; then
+        cpu_vendor=$(get_cpuinfo "cpu[ _]implementer")
+    fi
     log "DEBUG" "cpupath: CPU vendor of host system: '$cpu_vendor'"
   
     # Identify the host CPU flags or features
-    local cpu_flag_tag='flags'
     # cpuinfo systems print different line identifiers, eg features, instead of flags
-    [ "${cpu_vendor}" == "ARM" ] && cpu_flag_tag='flags'
-    [ "${machine_type}" == "aarch64" ] && [ "${cpu_vendor}x" == "x" ] && cpu_flag_tag='features'
-    [ "${machine_type}" == "ppc64le" ] && cpu_flag_tag='cpu'
+    local cpu_flag_tag;
+    if [ "${cpu_vendor}" == "ARM" ]; then
+        # if CPU vendor field is ARM, then we should be able to determine CPU microarchitecture based on 'flags' field
+        cpu_flag_tag='flags'
+    # if 64-bit Arm CPU without "ARM" as vendor ID, we need to take into account 'features' field
+    elif [ "${machine_type}" == "aarch64" ]; then
+        cpu_flag_tag='features'
+    # on 64-bit POWER, we need to look at 'cpu' field
+    elif [ "${machine_type}" == "ppc64le" ]; then
+        cpu_flag_tag='cpu'
+    else
+        cpu_flag_tag='flags'
+    fi
   
     local cpu_flags=$(get_cpuinfo "$cpu_flag_tag")
     log "DEBUG" "cpupath: CPU flags of host system: '$cpu_flags'"
diff --git a/tests/archdetect/aarch64/a64fx/Deucalion-Rocky85.all.output b/tests/archdetect/aarch64/a64fx/Deucalion-Rocky85.all.output
new file mode 100644
index 0000000000..f6f97c2aaa
--- /dev/null
+++ b/tests/archdetect/aarch64/a64fx/Deucalion-Rocky85.all.output
@@ -0,0 +1 @@
+aarch64/a64fx:aarch64/generic
diff --git a/tests/archdetect/aarch64/a64fx/Deucalion-Rocky85.cpuinfo b/tests/archdetect/aarch64/a64fx/Deucalion-Rocky85.cpuinfo
new file mode 100644
index 0000000000..2484dbe3e7
--- /dev/null
+++ b/tests/archdetect/aarch64/a64fx/Deucalion-Rocky85.cpuinfo
@@ -0,0 +1,8 @@
+processor       : 0
+BogoMIPS        : 200.00
+Features        : fp asimd evtstrm sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm fcma dcpop sve
+CPU implementer : 0x46
+CPU architecture: 8
+CPU variant     : 0x1
+CPU part        : 0x001
+CPU revision    : 0
diff --git a/tests/archdetect/aarch64/a64fx/Deucalion-Rocky85.output b/tests/archdetect/aarch64/a64fx/Deucalion-Rocky85.output
new file mode 100644
index 0000000000..13b6c575c1
--- /dev/null
+++ b/tests/archdetect/aarch64/a64fx/Deucalion-Rocky85.output
@@ -0,0 +1 @@
+aarch64/a64fx