diff --git a/armsrc/BigBuf.c b/armsrc/BigBuf.c
index e84433a98..31ecb4329 100644
--- a/armsrc/BigBuf.c
+++ b/armsrc/BigBuf.c
@@ -14,12 +14,12 @@
 #include "dbprint.h"
 #include "pm3_cmd.h"
 
-extern uint8_t _stack_start, __bss_end__;
+extern char _stack_start[], __bss_end__[];
 
 // BigBuf is the large multi-purpose buffer, typically used to hold A/D samples or traces.
 // Also used to hold various smaller buffers and the Mifare Emulator Memory.
 // We know that bss is aligned to 4 bytes.
-static uint8_t *BigBuf = &__bss_end__;
+static uint8_t *BigBuf = (uint8_t *)__bss_end__;
 
 /* BigBuf memory layout:
 Pointer to highest available memory: s_bigbuf_hi
@@ -69,7 +69,7 @@ static bool tracing = true;
 
 // compute the available size for BigBuf
 void BigBuf_initialize(void) {
-    s_bigbuf_size = (uint32_t)&_stack_start - (uint32_t)&__bss_end__;
+    s_bigbuf_size = (uint32_t)_stack_start - (uint32_t)__bss_end__;
     s_bigbuf_hi = s_bigbuf_size;
     trace_len = 0;
 }
diff --git a/armsrc/appmain.c b/armsrc/appmain.c
index f0402de1f..36b7b1768 100644
--- a/armsrc/appmain.c
+++ b/armsrc/appmain.c
@@ -70,7 +70,7 @@
 int DBGLEVEL = DBG_ERROR;
 uint8_t g_trigger = 0;
 bool g_hf_field_active = false;
-extern uint32_t _stack_start, _stack_end;
+extern char _stack_start[], _stack_end[];
 struct common_area common_area __attribute__((section(".commonarea")));
 static int button_status = BUTTON_NO_CLICK;
 static bool allow_send_wtx = false;
@@ -240,10 +240,9 @@ static uint32_t MeasureAntennaTuningLfData(void) {
 }
 
 void print_stack_usage(void) {
-    // pointer arithmetic is times 4. (two shifts to the left)
-    for (uint32_t *p = &_stack_start; ; ++p) {
+    for (uint32_t *p = (uint32_t *)_stack_start; ; ++p) {
         if (*p != 0xdeadbeef) {
-            Dbprintf("  Max stack usage......... %d / %d bytes", (&_stack_end - p) << 2, (&_stack_end - &_stack_start) << 2);
+            Dbprintf("  Max stack usage......... %d / %d bytes", _stack_end - (char *)p, _stack_end - _stack_start);
             break;
         }
     }
@@ -257,9 +256,9 @@ void ReadMem(int addr) {
 
 /* osimage version information is linked in, cf commonutil.h */
 /* bootrom version information is pointed to from _bootphase1_version_pointer */
-extern char *_bootphase1_version_pointer, _flash_start, _flash_end, __data_src_start__;
+extern char _bootphase1_version_pointer[], _flash_start[], _flash_end[], __data_src_start__[];
 #ifdef WITH_NO_COMPRESSION
-extern char *_bootrom_end, _bootrom_start, __os_size__;
+extern char _bootrom_end[], _bootrom_start[], __os_size__[];
 #endif
 static void SendVersion(void) {
     char temp[PM3_CMD_DATA_SIZE - 12]; /* Limited data payload in USB packets */
@@ -269,11 +268,11 @@ static void SendVersion(void) {
      * symbol _bootphase1_version_pointer, perform slight sanity checks on the
      * pointer, then use it.
      */
-    char *bootrom_version = *(char **)&_bootphase1_version_pointer;
+    char *bootrom_version = *(char **)_bootphase1_version_pointer;
 
     strncat(VersionString, " [ "_YELLOW_("ARM")" ]\n", sizeof(VersionString) - strlen(VersionString) - 1);
 
-    if (bootrom_version < &_flash_start || bootrom_version >= &_flash_end) {
+    if (bootrom_version < _flash_start || bootrom_version >= _flash_end) {
         strcat(VersionString, "bootrom version information appears invalid\n");
     } else {
         FormatVersionInformation(temp, sizeof(temp), "  bootrom: ", bootrom_version);
@@ -301,7 +300,7 @@ static void SendVersion(void) {
     }
 #ifndef WITH_NO_COMPRESSION
     // Send Chip ID and used flash memory
-    uint32_t text_and_rodata_section_size = (uint32_t)&__data_src_start__ - (uint32_t)&_flash_start;
+    uint32_t text_and_rodata_section_size = __data_src_start__ - _flash_start;
     uint32_t compressed_data_section_size = common_area.arg1;
 #endif
 
@@ -315,7 +314,7 @@ static void SendVersion(void) {
     struct p payload;
     payload.id = *(AT91C_DBGU_CIDR);
 #ifdef WITH_NO_COMPRESSION
-    payload.section_size = (uint32_t)&_bootrom_end - (uint32_t)&_bootrom_start + (uint32_t)&__os_size__;
+    payload.section_size = _bootrom_end - _bootrom_start + (uint32_t)__os_size__;
 #else
     payload.section_size = text_and_rodata_section_size + compressed_data_section_size;
 #endif
@@ -2440,7 +2439,7 @@ void  __attribute__((noreturn)) AppMain(void) {
     SpinDelay(100);
     BigBuf_initialize();
 
-    for (uint32_t *p = &_stack_start; p < (uint32_t *)((uintptr_t)&_stack_end - 0x200); ++p) {
+    for (uint32_t *p = (uint32_t *)_stack_start; p < (uint32_t *)_stack_end - 0x200; ++p) {
         *p = 0xdeadbeef;
     }
 
@@ -2501,8 +2500,8 @@ void  __attribute__((noreturn)) AppMain(void) {
     for (;;) {
         WDT_HIT();
 
-        if (_stack_start != 0xdeadbeef) {
-            Dbprintf("Stack overflow detected! Please increase stack size, currently %d bytes", (&_stack_end - &_stack_start) << 2);
+        if (*((uint32_t *)_stack_start) != 0xdeadbeef) {
+            Dbprintf("Stack overflow detected! Please increase stack size, currently %d bytes", _stack_end - _stack_start);
             Dbprintf("Unplug your device now.");
             while (1);
         }
diff --git a/armsrc/fpgaloader.c b/armsrc/fpgaloader.c
index 2df952214..67974c4c7 100644
--- a/armsrc/fpgaloader.c
+++ b/armsrc/fpgaloader.c
@@ -34,7 +34,7 @@ typedef lz4_stream *lz4_streamp;
 static int downloaded_bitstream = 0;
 
 // this is where the bitstreams are located in memory:
-extern uint8_t _binary_obj_fpga_all_bit_z_start, _binary_obj_fpga_all_bit_z_end;
+extern char _binary_obj_fpga_all_bit_z_start[], _binary_obj_fpga_all_bit_z_end[];
 
 static uint8_t *fpga_image_ptr = NULL;
 static uint32_t uncompressed_bytes_cnt;
@@ -235,8 +235,8 @@ static bool reset_fpga_stream(int bitstream_version, lz4_streamp compressed_fpga
     uncompressed_bytes_cnt = 0;
 
     // initialize z_stream structure for inflate:
-    compressed_fpga_stream->next_in = (char *)&_binary_obj_fpga_all_bit_z_start;
-    compressed_fpga_stream->avail_in = &_binary_obj_fpga_all_bit_z_end - &_binary_obj_fpga_all_bit_z_start;
+    compressed_fpga_stream->next_in = _binary_obj_fpga_all_bit_z_start;
+    compressed_fpga_stream->avail_in = _binary_obj_fpga_all_bit_z_end - _binary_obj_fpga_all_bit_z_start;
 
     int res = LZ4_setStreamDecode(compressed_fpga_stream->lz4StreamDecode, NULL, 0);
     if (res == 0)
diff --git a/armsrc/start.c b/armsrc/start.c
index 062a83eb9..f6a3fd1de 100644
--- a/armsrc/start.c
+++ b/armsrc/start.c
@@ -21,16 +21,16 @@
 #include "string.h"
 
 extern struct common_area common_area;
-extern char __data_src_start__, __data_start__, __data_end__, __bss_start__, __bss_end__;
+extern char __data_src_start__[], __data_start__[], __data_end__[], __bss_start__[], __bss_end__[];
 
 #ifndef WITH_NO_COMPRESSION
 static void uncompress_data_section(void) {
     int avail_in;
-    memcpy(&avail_in, &__data_src_start__, sizeof(int));
-    int avail_out = &__data_end__ - &__data_start__;  // uncompressed size. Correct.
+    memcpy(&avail_in, __data_src_start__, sizeof(int));
+    int avail_out = __data_end__ - __data_start__;  // uncompressed size. Correct.
     // uncompress data segment to RAM
-    uintptr_t p = (uintptr_t)&__data_src_start__;
-    int res = LZ4_decompress_safe((char *)p + 4, &__data_start__, avail_in, avail_out);
+    char *p = __data_src_start__;
+    int res = LZ4_decompress_safe(p + 4, __data_start__, avail_in, avail_out);
 
     if (res < 0)
         return;
@@ -53,18 +53,16 @@ void Vector(void) {
 
     /* Set up data segment: Copy from flash to ram */
 #ifdef WITH_NO_COMPRESSION
-    char *data_src = &__data_src_start__;
-    char *data_dst = &__data_start__;
-    char *data_end = &__data_end__;
-    while (data_dst < data_end) *data_dst++ = *data_src++;
+    char *data_src = __data_src_start__;
+    char *data_dst = __data_start__;
+    while (data_dst < __data_end__) *data_dst++ = *data_src++;
 #else
     uncompress_data_section();
 #endif
 
     /* Set up (that is: clear) BSS. */
-    char *bss_dst = &__bss_start__;
-    char *bss_end = &__bss_end__;
-    while (bss_dst < bss_end) *bss_dst++ = 0;
+    char *bss_dst = __bss_start__;
+    while (bss_dst < __bss_end__) *bss_dst++ = 0;
 
     AppMain();
 }
diff --git a/client/src/cmdhw.c b/client/src/cmdhw.c
index eed42dff5..94f49de2b 100644
--- a/client/src/cmdhw.c
+++ b/client/src/cmdhw.c
@@ -268,7 +268,7 @@ static void lookupChipID(uint32_t iChipID, uint32_t mem_used) {
             break;
     }
 
-    PrintAndLogEx(NORMAL, "  --= %s " _YELLOW_("%uK") " bytes ( " _YELLOW_("%2.0f%%") " used )"
+    PrintAndLogEx(NORMAL, "  --= %s " _YELLOW_("%uK") " bytes ( " _YELLOW_("%2.1f%%") " used )"
                   , asBuff
                   , mem_avail
                   , mem_avail == 0 ? 0.0f : (float)mem_used / (mem_avail * 1024) * 100