diff --git a/.cargo/config.toml b/.cargo/config.toml
index b452adf..9b37f7d 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -4,8 +4,9 @@ pipelining = true
 
 [target.aarch64-vesper-metta]
 rustflags = [
-    "-C", "target-feature=-fp-armv8",
-    "-C", "target-cpu=cortex-a53",
+    "-C", "target-cpu=cortex-a53", # raspi 2 .. 3b+
+    #"-C", "target-cpu=cortex-a73", # raspi 4
+    # ^^ how to set this dynamicall depending on the features??
     "-C", "embed-bitcode=yes",
     "-Z", "macro-backtrace",
 ]
diff --git a/targets/aarch64-vesper-metta.json b/targets/aarch64-vesper-metta.json
index 79c423f..f7fb0c8 100644
--- a/targets/aarch64-vesper-metta.json
+++ b/targets/aarch64-vesper-metta.json
@@ -2,20 +2,23 @@
   "llvm-target": "aarch64-unknown-none",
   "data-layout": "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128",
   "arch": "aarch64",
+  "features": "+strict-align,-neon,-fp-armv8",
   "os": "vesper",
   "vendor": "metta",
   "env": "",
   "executables": true,
   "panic-strategy": "abort",
-  "linker-flavor": "ld.lld",
   "linker": "rust-lld",
+  "linker-flavor": "ld.lld",
   "pre-link-args": {
     "ld.lld": [
       "--print-gc-sections"
     ]
   },
   "disable-redzone": true,
+  "relocation-model": "static",
   "target-endian": "little",
+  "max-atomic-width": 128,
   "target-c-int-width": "32",
   "target-pointer-width": "64"
 }