diff --git a/app/include/rom.h b/app/include/rom.h
index 80168fff..7de1c5e0 100644
--- a/app/include/rom.h
+++ b/app/include/rom.h
@@ -147,4 +147,7 @@ void srand(unsigned int);
 
 void uart_div_modify(int no, unsigned int freq);
 
+/* Returns 0 on success, 1 on failure */
+uint8_t SPIRead(uint32_t src_addr, uint32_t *des_addr, uint32_t size);
+
 #endif
diff --git a/app/user/Makefile b/app/user/Makefile
index 3744f4ee..50da583a 100644
--- a/app/user/Makefile
+++ b/app/user/Makefile
@@ -15,6 +15,7 @@ ifndef PDIR
 GEN_LIBS = libuser.a
 endif
 
+STD_CFLAGS=-std=gnu11 -Wimplicit
 
 #############################################################
 # Configuration i.e. compile options etc.
diff --git a/app/user/user_exceptions.h b/app/user/user_exceptions.h
index ae9be64e..c1611a21 100644
--- a/app/user/user_exceptions.h
+++ b/app/user/user_exceptions.h
@@ -3,3 +3,4 @@
 #include <xtensa/corebits.h>
 
 void load_non_32_wide_handler (struct exception_frame *ef, uint32_t cause) TEXT_SECTION_ATTR;
+void __real__xtos_set_exception_handler (uint32_t cause, exception_handler_fn fn);
diff --git a/app/user/user_main.c b/app/user/user_main.c
index def44315..c4b9d367 100644
--- a/app/user/user_main.c
+++ b/app/user/user_main.c
@@ -13,6 +13,7 @@
 #include "c_string.h"
 #include "c_stdlib.h"
 #include "flash_fs.h"
+#include "flash_api.h"
 #include "user_interface.h"
 #include "user_exceptions.h"
 #include "user_modules.h"
@@ -69,7 +70,7 @@ void TEXT_SECTION_ATTR user_start_trampoline (void)
    * terse and not as readable as one might like.
    */
   SPIFlashInfo sfi;
-  SPIRead (0, &sfi, sizeof (sfi)); // Cache read not enabled yet, safe to use
+  SPIRead (0, (uint32_t *)(&sfi), sizeof (sfi)); // Cache read not enabled yet, safe to use
   if (sfi.size < 2) // Compensate for out-of-order 4mbit vs 2mbit values
     sfi.size ^= 1;
   uint32_t flash_end_addr = (256 * 1024) << sfi.size;
diff --git a/sdk-overrides/include/osapi.h b/sdk-overrides/include/osapi.h
index 9253e581..6e8c56e3 100644
--- a/sdk-overrides/include/osapi.h
+++ b/sdk-overrides/include/osapi.h
@@ -12,6 +12,8 @@ unsigned int uart_baudrate_detect(unsigned int uart_no, unsigned int async);
 
 void NmiTimSetFunc(void (*func)(void));
 
+void call_user_start(void);
+
 #include_next "osapi.h"
 
 #endif