Changed RSA4096 to use SP math. Fix to disable dynamic stacks `WOLFSSL_SP_NO_DYN_STACK`. Added G0 details. Update submodules.

arch.mk

@@ -2,10 +2,6 @@
 
 UPDATE_OBJS:=./src/update_flash.o
 
-ifeq ($(SIGN),RSA4096)
-  SPMATH=0
-endif
-
 # check for FASTMATH or SP_MATH
 ifeq ($(SPMATH),1)
   MATH_OBJS:=./lib/wolfssl/wolfcrypt/src/sp_int.o

docs/Targets.md

@@ -179,16 +179,39 @@ Example 128KB partitioning on STM32-G070:
 #define WOLFBOOT_PARTITION_SWAP_ADDRESS      0x1E000
 ```
 
-### Building
+### Building STM32G0
 
-Use `make TARGET=stm32g0`. The option `CORTEX_M0` is automatically selected for this target.
+Reference configuration (see `./config/examples/stm32g0.config`).
+You can copy this to wolfBoot root as `.config`: `cp ./config/examples/stm32g0.config .config`.
+To build you can use `make`.
+
+The TARGET for this is `stm32g0`: `make TARGET=stm32g0`.
+The option `CORTEX_M0` is automatically selected for this target.
 The option `NVM_FLASH_WRITEONCE=1` is mandatory on this target, since the IAP driver does not support
 multiple writes after each erase operation.
 
-Compile with:
+Compile requirements:
-
 `make TARGET=stm32g0 NVM_FLASH_WRITEONCE=1`
 
+### Debugging STM32G0
+
+Use `make DEBUG=1` and reload firmware.
+
+```
+st-flash write factory.bin 0x08000000
+
+# Start GDB server
+st-util -p 3333
+```
+
+wolfBoot has a .gdbinit to configure GDB
+
+```
+arm-none-eabi-gdb
+add-symbol-file test-app/image.elf 0x08008100
+mon reset init
+```
+
 
 ## STM32WB55
 

include/user_settings.h

@@ -69,6 +69,8 @@
 #   define WOLFSSL_SP_SMALL
 #   define SP_WORD_SIZE 32
 #   define WOLFSSL_HAVE_SP_ECC
+#   define WOLFSSL_SP_NO_MALLOC
+#   define WOLFSSL_SP_NO_DYN_STACK
 
 /* ECC options disabled to reduce size */
 #   define NO_ECC_SIGN
@@ -86,26 +88,35 @@
 #endif
 
 #ifdef WOLFBOOT_SIGN_RSA2048
-#  define HAVE_RSA
 #   define RSA_LOW_MEM
 #   define WOLFSSL_RSA_VERIFY_INLINE
+#   define FP_MAX_BITS (2048 * 2)
+    /* sp math */
 #   define WOLFSSL_HAVE_SP_RSA
 #   define WOLFSSL_SP
 #   define WOLFSSL_SP_SMALL
 #   define WOLFSSL_SP_MATH
 #   define SP_WORD_SIZE 32
 #   define WOLFSSL_SP_NO_3072
+#   define WOLFSSL_SP_NO_MALLOC
+#   define WOLFSSL_SP_NO_DYN_STACK
 #endif
 
 #ifdef WOLFBOOT_SIGN_RSA4096
-#  define HAVE_RSA
 #   define RSA_LOW_MEM
-#  define WOLFSSL_RSA_PUBLIC_ONLY
 #   define WOLFSSL_RSA_VERIFY_INLINE
 #   define FP_MAX_BITS (4096 * 2)
-#  define WC_RSA_BLINDING
+    /* sp math */
-#  define USE_FAST_MATH
+#   define WOLFSSL_HAVE_SP_RSA
-#  define TFM_TIMING_RESISTANT
+#   define WOLFSSL_SP
+#   define WOLFSSL_SP_SMALL
+#   define WOLFSSL_SP_MATH
+#   define SP_WORD_SIZE 32
+#   define WOLFSSL_SP_4096
+#   define WOLFSSL_SP_NO_2048
+#   define WOLFSSL_SP_NO_3072
+#   define WOLFSSL_SP_NO_MALLOC
+#   define WOLFSSL_SP_NO_DYN_STACK
 #endif
 
 #ifdef WOLFBOOT_HASH_SHA3_384

lib/wolfTPM

@@ -1 +1 @@
-Subproject commit 30c4ace7cc7a19d8100b5cfea85bd30dae99194c
+Subproject commit c4810e1b070ff950b6274e4ade0960d0bc010bf0

lib/wolfssl

@@ -1 +1 @@
-Subproject commit b11b08bb100b4be303842f14d700daea646133c1
+Subproject commit 761bebc4a0ea3305f5a44d257bb7c37f774e7f3c

options.mk

@@ -75,7 +75,6 @@ ifeq ($(SIGN),RSA4096)
     ./lib/wolfssl/wolfcrypt/src/rsa.o \
     ./lib/wolfssl/wolfcrypt/src/asn.o \
     ./lib/wolfssl/wolfcrypt/src/hash.o \
-    ./lib/wolfssl/wolfcrypt/src/wolfmath.o \
     ./lib/wolfssl/wolfcrypt/src/wc_port.o \
     ./src/xmalloc_rsa.o
   PUBLIC_KEY_OBJS=./src/rsa4096_pub_key.o