Zephyr: PR Fixes

Signed-off-by: Zingo Andersen <Zingo.Andersen@arm.com>
Change-Id: I8fc09f92447475f0735686f1e29d9040f796b73f

Author: zingo

.ci/scripts/test_zephyr.sh

@@ -32,17 +32,28 @@ Options:
 EOF
 }
 
+require_value() {
+  if [[ -z "${2:-}" || "${2:-}" == -* ]]; then
+    echo "ERROR: $1 requires a non-empty argument" >&2
+    usage >&2
+    exit 1
+  fi
+}
+
 while [[ $# -gt 0 ]]; do
   case "$1" in
     --zephyr-samples-readme-path)
+      require_value "$1" "${2:-}"
       ZEPHYR_SAMPLES_README_PATH="$2"
       shift 2
       ;;
     --zephyr-dev-root)
+      require_value "$1" "${2:-}"
       ZEPHYR_DEV_ROOT="$2"
       shift 2
       ;;
     --targets)
+      require_value "$1" "${2:-}"
       TARGETS_ARG="$2"
       shift 2
       ;;

docs/source/zephyr_alif_tutorial.md

@@ -383,13 +383,14 @@ I [executorch:main.cpp]
 I [executorch:main.cpp] MobileNetV2 Demo Complete
 I [executorch:main.cpp] Model size: 3380576 bytes
 I [executorch:main.cpp] Input: [1, 3, 224, 224] NCHW RGB tensor (150528 bytes)
-I [executorch:main.cpp] Output: 1000 ImageNet classes (top-5 shown)
+I [executorch:main.cpp] Output: 1000 classes (top-5 shown)
 I [executorch:main.cpp] Inference time: 30 ms
 I [executorch:main.cpp] ========================================
 ```
 
-All predictions show `0.0000` because `mv2_untrained` has random weights.
-Use `mv2` (with torchvision pretrained weights) for meaningful class scores.
+Use `mv2_untrained` instead of `mv2` if you want to avoid downloading
+pretrained weights. In that case the class scores are arbitrary and may all be
+close to `0.0000`.
 
 ## Troubleshooting
 

examples/zephyr/x86_64-linux-arm-zephyr-eabi-gcc.cmake

@@ -56,12 +56,7 @@ add_compile_definitions("$<$<NOT:$<CONFIG:DEBUG>>:NDEBUG>")
 
 # Link options
 add_link_options(-mcpu=${GCC_CPU} -mthumb)
-
-# Zephyr SDK GCC defaults to Picolibc and does not ship GNU Arm's
-# nosys.specs/rdimon.specs files.
-if(SEMIHOSTING)
-  add_link_options(-lsemihost)
-endif()
+add_link_options("-T${CMAKE_CURRENT_LIST_DIR}/generic-no-memory.ld")
 
 # Set floating point unit
 if(CMAKE_SYSTEM_PROCESSOR MATCHES "\\+fp")