feat(swan_r5): the upper 1MB of flash (bank 2) is made available for the filesystem

Author: m-mcgowan

ports/stm/boards/STM32L4R5_boot.ld

@@ -8,7 +8,7 @@ MEMORY
     FLASH (rx)          : ORIGIN = 0x08000000, LENGTH = 2048K /* entire flash */
     FLASH_ISR (rx)      : ORIGIN = 0x08010000, LENGTH = 4K /* ISR vector. Kind of wasteful. */
     FLASH_FIRMWARE (rx) : ORIGIN = 0x08011000, LENGTH = 1024K-128K-64K-4K  /* For now, limit to 1MB so that bank switching is still possible. */
-    FLASH_FS (rw)       : ORIGIN = 0x080e0000, LENGTH = 128K
+    FLASH_FS (rw)       : ORIGIN = 0x08100000, LENGTH = 1024K
     RAM (xrw)           : ORIGIN = 0x20000000, LENGTH = 640K
 }
 

ports/stm/boards/STM32L4R5_default.ld

@@ -8,7 +8,7 @@ MEMORY
     FLASH (rx)          : ORIGIN = 0x08000000, LENGTH = 2048K /* entire flash */
     FLASH_ISR (rx)      : ORIGIN = 0x08000000, LENGTH = 4K /* ISR vector. Kind of wasteful. */
     FLASH_FIRMWARE (rx) : ORIGIN = 0x08001000, LENGTH = 1024K-128K-4K  /* For now, limit to 1MB so that bank switching is still possible. */
-    FLASH_FS (rw)       : ORIGIN = 0x080e0000, LENGTH = 128K
+    FLASH_FS (rw)       : ORIGIN = 0x08100000, LENGTH = 1024K
     RAM (xrw)           : ORIGIN = 0x20000000, LENGTH = 640K
 }
 

ports/stm/supervisor/internal_flash.c

@@ -95,12 +95,8 @@ STATIC const flash_layout_t flash_layout[] = {
 STATIC uint8_t _flash_cache[0x20000] __attribute__((aligned(4)));
 
 #elif defined(STM32L4)
-// todo - the L4 devices can have different flash sizes and different page sizes
-// depending upon the dual bank configuration
-// This is hardcoded for the Swan R5. When support for other devices is needed more conditionals will be required
-// to differentiate.
 STATIC const flash_layout_t flash_layout[] = {
-    { 0x08000000, 0x1000, 256 },
+    { 0x08100000, 0x1000, 256 },
 };
 STATIC uint8_t _flash_cache[0x1000] __attribute__((aligned(4)));
 
@@ -174,6 +170,9 @@ uint32_t flash_get_sector_info(uint32_t addr, uint32_t *start_addr, uint32_t *si
 }
 
 void supervisor_flash_init(void) {
+    #ifdef STM32L4
+    // todo - check that the device is in dual bank mode
+    #endif
 }
 
 uint32_t supervisor_flash_get_block_size(void) {
@@ -202,7 +201,7 @@ void port_internal_flash_flush(void) {
     FLASH_EraseInitTypeDef EraseInitStruct = {};
     #if CPY_STM32L4
     EraseInitStruct.TypeErase = TYPEERASE_PAGES;
-    EraseInitStruct.Banks = FLASH_BANK_1;
+    EraseInitStruct.Banks = FLASH_BANK_2;       // filesystem stored in upper 1MB of flash in dual bank mode
     #else
     EraseInitStruct.TypeErase = TYPEERASE_SECTORS;
     EraseInitStruct.VoltageRange = VOLTAGE_RANGE_3; // voltage range needs to be 2.7V to 3.6V

ports/stm/supervisor/internal_flash.h

@@ -97,9 +97,9 @@
 #endif
 
 #ifdef STM32L4R5xx
-#define STM32_FLASH_SIZE 0x100000 // 1MB    // for now just use the first bank
-#define INTERNAL_FLASH_FILESYSTEM_SIZE 0x20000 // 128KiB
-#define INTERNAL_FLASH_FILESYSTEM_START_ADDR 0x080e0000
+#define STM32_FLASH_SIZE 0x200000 // 2MB
+#define INTERNAL_FLASH_FILESYSTEM_SIZE 0x100000 // 1024KiB
+#define INTERNAL_FLASH_FILESYSTEM_START_ADDR 0x08100000
 #endif
 
 #define INTERNAL_FLASH_FILESYSTEM_NUM_BLOCKS (INTERNAL_FLASH_FILESYSTEM_SIZE / FILESYSTEM_BLOCK_SIZE)