diff --git a/utils/flash.c b/utils/flash.c
index b6a651508..b402d6319 100644
--- a/utils/flash.c
+++ b/utils/flash.c
@@ -110,7 +110,7 @@ void flash_release(struct flash_device *fdev)
     free(fdev);
 }
 
-int flash_read(struct flash_device *fdev, size_t addr, size_t len, void* dest)
+int flash_read(struct flash_device *fdev, size_t addr, size_t len, void *dest)
 {
     if (!fdev)
         return -1;
@@ -118,7 +118,7 @@ int flash_read(struct flash_device *fdev, size_t addr, size_t len, void* dest)
     return fdev->driver->read(fdev, addr, len, dest);
 }
 
-int flash_write(struct flash_device *fdev, size_t addr, size_t len, void* src)
+int flash_write(struct flash_device *fdev, size_t addr, size_t len, const void *src)
 {
     if (!fdev)
         return -1;
diff --git a/utils/flash.h b/utils/flash.h
index 74647b839..94925269e 100644
--- a/utils/flash.h
+++ b/utils/flash.h
@@ -75,22 +75,22 @@ struct flash_device {
 struct flash_ops {
     void (*init)(struct flash_device *fdev);
     int (*sector_erase)(struct flash_device *fdev, size_t addr);
-    int (*buffered_program)(struct flash_device *fdev, size_t addr, size_t len, void *src);
+    int (*buffered_program)(struct flash_device *fdev, size_t addr, size_t len, const void *src);
 };
 
 struct flash_driver {
     int (*init)(struct flash_device *fdev);
     void (*release)(struct flash_device *fdev);
-    int (*read)(struct flash_device *fdev, size_t addr, size_t len, void* dest);
-    int (*write)(struct flash_device *fdev, size_t addr, size_t len, void* src);
+    int (*read)(struct flash_device *fdev, size_t addr, size_t len, void *dest);
+    int (*write)(struct flash_device *fdev, size_t addr, size_t len, const void *src);
     int (*erase)(struct flash_device *fdev, size_t addr, size_t len);
 };
 
 struct flash_device *flash_open_spi(int data_width, volatile uint8_t *ctrl_reg);
 struct flash_device *flash_open_bpi(int data_width, volatile uint8_t *ctrl_reg, volatile uint8_t *addr_reg, volatile uint8_t *data_reg);
 void flash_release(struct flash_device *fdev);
-int flash_read(struct flash_device *fdev, size_t addr, size_t len, void* dest);
-int flash_write(struct flash_device *fdev, size_t addr, size_t len, void* src);
+int flash_read(struct flash_device *fdev, size_t addr, size_t len, void *dest);
+int flash_write(struct flash_device *fdev, size_t addr, size_t len, const void *src);
 int flash_erase(struct flash_device *fdev, size_t addr, size_t len);
 
 #endif /* FLASH_H */
diff --git a/utils/flash_bpi.c b/utils/flash_bpi.c
index dadc139d7..8e5227c8f 100644
--- a/utils/flash_bpi.c
+++ b/utils/flash_bpi.c
@@ -197,9 +197,9 @@ int bpi_flash_intel_sector_erase(struct flash_device *fdev, size_t addr)
     return 0;
 }
 
-int bpi_flash_intel_buffered_program(struct flash_device *fdev, size_t addr, size_t len, void *src)
+int bpi_flash_intel_buffered_program(struct flash_device *fdev, size_t addr, size_t len, const void *src)
 {
-    uint8_t *s = src;
+    const uint8_t *s = (const uint8_t *)src;
 
     bpi_flash_set_addr(fdev, addr);
     bpi_flash_write_cur(fdev, BPI_INTEL_BUFFERED_PROGRAM_SETUP);
@@ -296,9 +296,9 @@ int bpi_flash_amd_sector_erase(struct flash_device *fdev, size_t addr)
     return 0;
 }
 
-int bpi_flash_amd_buffered_program(struct flash_device *fdev, size_t addr, size_t len, void *src)
+int bpi_flash_amd_buffered_program(struct flash_device *fdev, size_t addr, size_t len, const void *src)
 {
-    uint8_t *s = src;
+    const uint8_t *s = (const uint8_t *)src;
 
     bpi_flash_amd_unlock(fdev);
     bpi_flash_write_word(fdev, addr, BPI_AMD_BUFFERED_PROGRAM_SETUP);
@@ -379,9 +379,9 @@ int bpi_flash_micron_sector_erase(struct flash_device *fdev, size_t addr)
     return 0;
 }
 
-int bpi_flash_micron_buffered_program(struct flash_device *fdev, size_t addr, size_t len, void *src)
+int bpi_flash_micron_buffered_program(struct flash_device *fdev, size_t addr, size_t len, const void *src)
 {
-    uint8_t *s = src;
+    const uint8_t *s = (const uint8_t *)src;
 
     bpi_flash_set_addr(fdev, addr);
     bpi_flash_write_cur(fdev, BPI_MICRON_BUFFERED_PROGRAM_SETUP);
@@ -577,9 +577,9 @@ int bpi_flash_read(struct flash_device *fdev, size_t addr, size_t len, void *des
     return 0;
 }
 
-int bpi_flash_write(struct flash_device *fdev, size_t addr, size_t len, void *src)
+int bpi_flash_write(struct flash_device *fdev, size_t addr, size_t len, const void *src)
 {
-    char *s = src;
+    const char *s = src;
 
     while (len > 0)
     {
diff --git a/utils/flash_spi.c b/utils/flash_spi.c
index bc4a7f46a..c5c890d82 100644
--- a/utils/flash_spi.c
+++ b/utils/flash_spi.c
@@ -431,9 +431,9 @@ int spi_flash_read(struct flash_device *fdev, size_t addr, size_t len, void *des
     return 0;
 }
 
-int spi_flash_write(struct flash_device *fdev, size_t addr, size_t len, void *src)
+int spi_flash_write(struct flash_device *fdev, size_t addr, size_t len, const void *src)
 {
-    char *s = src;
+    const char *s = src;
 
     int protocol = SPI_PROTO_STR;
 
diff --git a/utils/mqnic-fw.c b/utils/mqnic-fw.c
index b53f0f3af..7a09bf482 100644
--- a/utils/mqnic-fw.c
+++ b/utils/mqnic-fw.c
@@ -131,7 +131,7 @@ static void usage(char *name)
         name);
 }
 
-int flash_read_progress(struct flash_device *fdev, size_t addr, size_t len, void* dest)
+int flash_read_progress(struct flash_device *fdev, size_t addr, size_t len, void *dest)
 {
     int ret;
     size_t remain = len;
@@ -181,7 +181,7 @@ int flash_read_progress(struct flash_device *fdev, size_t addr, size_t len, void
     return 0;
 }
 
-int flash_write_progress(struct flash_device *fdev, size_t addr, size_t len, void* src)
+int flash_write_progress(struct flash_device *fdev, size_t addr, size_t len, const void *src)
 {
     int ret;
     size_t remain = len;