Arm backend: Make the CI green by not testing Dedicated_Sram for the Ethos-U85 (#10973)

Temporary solution to the problem in
#10958 The
arm_executor_runner.cpp need to declare the ethosu_fast_scratch array
and pass it onto to the EthosUBackend.cpp. It is important that for
Shared_Sram, the ethosu_fast_scratch is nullptr and for Dedicated_Sram
it points to the fast memory array.

Author: gggekov

backends/arm/scripts/build_executor_runner.sh

@@ -103,7 +103,7 @@ then
     memory_mode="Shared_Sram"
     if [[ ${target} =~ "ethos-u85" ]]
     then
-        memory_mode="Dedicated_Sram_384KB"
+        memory_mode="Sram_Only"
     fi
 fi
 

backends/arm/test/test_arm_baremetal.sh

@@ -210,7 +210,10 @@ test_models_ethos-u85() { # End to End model tests using model_test.py
     python3 backends/arm/test/test_model.py --test_output=arm_test/test_model --target=ethos-u85-512 --model=mv3 --extra_flags="-DET_ATOL=5.00 -DET_RTOL=5.00"
     python3 backends/arm/test/test_model.py --test_output=arm_test/test_model --target=ethos-u85-128 --model=lstm --extra_flags="-DET_ATOL=0.03 -DET_RTOL=0.03"
     python3 backends/arm/test/test_model.py --test_output=arm_test/test_model --target=ethos-u85-128 --model=w2l --extra_flags="-DET_ATOL=0.01 -DET_RTOL=0.01"
-    python3 backends/arm/test/test_model.py --test_output=arm_test/test_model --target=ethos-u85-256 --model=ic4 --extra_flags="-DET_ATOL=0.8 -DET_RTOL=0.8" --timeout=2400
+    # Temporarily not test inception_v4 on Ethos-U85. To support inception_v4 properly on Ethos-U85, we need to run the model in Dedicated_Sram memory mode with
+    # 384KB(or another amount lower than 2MB) of SRAM passed as fast scratch area. The PR adding support for Dedicated_Sram(https://github.com/pytorch/executorch/pull/10714) 
+    # was reverted due to a change required in an internal variant of the examples/arm/executor_runner/arm_executor_runner.cpp
+    # python3 backends/arm/test/test_model.py --test_output=arm_test/test_model --target=ethos-u85-256 --model=ic4 --extra_flags="-DET_ATOL=0.8 -DET_RTOL=0.8" --timeout=2400
 
     echo "${TEST_SUITE_NAME}: PASS"
     }

backends/arm/test/test_model.py

@@ -81,7 +81,7 @@ def get_args():
         if "u55" in args.target:
             args.memory_mode = "Shared_Sram"
         elif "u85" in args.target:
-            args.memory_mode = "Dedicated_Sram_384KB"
+            args.memory_mode = "Sram_Only"
         else:
             raise RuntimeError(f"Invalid target name {args.target}")
 

examples/arm/run.sh

@@ -110,7 +110,7 @@ then
     memory_mode="Shared_Sram"
     if [[ ${target} =~ "ethos-u85" ]]
     then
-        memory_mode="Dedicated_Sram_384KB"
+        memory_mode="Sram_Only"
     fi
 fi