Pico flash size bytes (#159)

* Move PICO_FLASH_SIZE_BYTES out of platform_defs.h since it precedes board config; also default to -1 for unknown

* make default for PICO_FLASH_SIZE_BYTES undefined - i.e. no value

src/rp2040/hardware_regs/include/hardware/platform_defs.h

@@ -46,9 +46,5 @@
 #endif
 #endif
 
-#ifndef PICO_FLASH_SIZE_BYTES
-#define PICO_FLASH_SIZE_BYTES (2 * 1024 * 1024)
-#endif
-
 #endif
 

src/rp2_common/hardware_flash/include/hardware/flash.h

@@ -9,17 +9,6 @@
 
 #include "pico.h"
 
-// PICO_CONFIG: PARAM_ASSERTIONS_ENABLED_FLASH, Enable/disable assertions in the flash module, type=bool, default=0, group=hardware_flash
-#ifndef PARAM_ASSERTIONS_ENABLED_FLASH
-#define PARAM_ASSERTIONS_ENABLED_FLASH 0
-#endif
-
-#define FLASH_PAGE_SIZE (1u << 8)
-#define FLASH_SECTOR_SIZE (1u << 12)
-#define FLASH_BLOCK_SIZE (1u << 16)
-
-#define FLASH_UNIQUE_ID_SIZE_BYTES 8
-
 /** \file flash.h
  *  \defgroup hardware_flash hardware_flash
  *
@@ -44,6 +33,22 @@
  * \include flash_program.c
  */
 
+// PICO_CONFIG: PARAM_ASSERTIONS_ENABLED_FLASH, Enable/disable assertions in the flash module, type=bool, default=0, group=hardware_flash
+#ifndef PARAM_ASSERTIONS_ENABLED_FLASH
+#define PARAM_ASSERTIONS_ENABLED_FLASH 0
+#endif
+
+#define FLASH_PAGE_SIZE (1u << 8)
+#define FLASH_SECTOR_SIZE (1u << 12)
+#define FLASH_BLOCK_SIZE (1u << 16)
+
+#define FLASH_UNIQUE_ID_SIZE_BYTES 8
+
+// PICO_CONFIG: PICO_FLASH_SIZE_BYTES, size of primary flash in bytes, type=int, default=-1, group=hardware_flash
+#ifndef PICO_FLASH_SIZE_BYTES
+#warning PICO_FLASH_SIZE_BYTES is not set
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif