Fix intrinsics error

Cargo.toml

@@ -29,6 +29,7 @@ apdu-dispatch = { git = "https://github.com/Nitrokey/apdu-dispatch.git", tag = "
 ctap-types = { git = "https://github.com/trussed-dev/ctap-types.git", rev = "a9f8003a1d9f05f9eea39e615b9159bc0613fcb5" }
 ctaphid-dispatch = { git = "https://github.com/Nitrokey/ctaphid-dispatch.git", tag = "v0.1.1-nitrokey.3" }
 littlefs2 = { git = "https://github.com/trussed-dev/littlefs2", rev = "ebd27e49ca321089d01d8c9b169c4aeb58ceeeca" }
+littlefs2-sys = { git = "https://github.com/trussed-dev/littlefs2-sys.git", rev = "39626c0dbc2f6c38b74889a5bf9d5a200614f121" }
 usbd-ctaphid = { git = "https://github.com/trussed-dev/usbd-ctaphid.git", rev = "1db2e014f28669bc484c81ab0406c54b16bba33c" }
 usbd-ccid = { git = "https://github.com/Nitrokey/usbd-ccid", tag = "v0.2.0-nitrokey.1" }
 p256-cortex-m4  = { git = "https://github.com/ycrypto/p256-cortex-m4.git", rev = "cdb31e12594b4dc1f045b860a885fdc94d96aee2" }

runners/embedded/Cargo.toml

@@ -44,6 +44,9 @@ systick-monotonic = { version = "1.0.0", optional = true }
 ### Allocator
 alloc-cortex-m = { version = "0.4.3", optional = true }
 
+# littlefs2-sys for intrinsics feature
+littlefs2-sys = { version = "0.1.7", optional = true }
+
 [build-dependencies]
 cargo-lock = "7"
 memory-regions = "1"
@@ -60,6 +63,9 @@ provisioner = ["apps/nk3-provisioner", "boards/provisioner", "write-undefined-fl
 
 no-delog = ["boards/no-delog", "delog/knock-it-off"]
 
+# Disable littlefs use of compiler intrinsics
+littlefs-software-intrinsics = ["dep:littlefs2-sys", "littlefs2-sys/software-intrinsics"]
+
 # Do not use encryption for the filesystem
 no-encrypted-storage = ["boards/no-encrypted-storage"]
 

runners/embedded/Makefile

@@ -35,15 +35,13 @@ SHOULD_BUILD_STD=$(shell python3 -c "p = True if '$(BOARD)' == 'nk3xn' and 'test
 ifeq ($(SHOULD_BUILD_STD), "True")
 	BUILD_STD='-Zbuild-std=core,alloc,panic_abort -Zbuild-std-features=panic_immediate_abort'
 	TOOLCHAIN='RUSTUP_TOOLCHAIN=nightly-2024-04-01'
-else
-	BUILD_STD=''
-	TOOLCHAIN=''
+	LITTLEFS_INTRINSICS_FEATURE='littlefs-software-intrinsics'
 endif
 
 RAW_OUT = $(CARGO_TARGET_DIR)/$(TARGET)/$(CUSTOM_PROFILE)/$(SOC)_runner
 
 # feature definition
-BUILD_FEATURES := board-$(BOARD),$(FEATURES),$(NO_DELOG_FEATURE)
+BUILD_FEATURES := board-$(BOARD),$(FEATURES),$(NO_DELOG_FEATURE),$(LITTLEFS_INTRINSICS_FEATURE)
 
 .PHONY: list build build-all reset program check doc check-all clean clean-all check-env set-vars lint-all lint