From fdaff00c78e69644eddf828b9b23795db168f8d4 Mon Sep 17 00:00:00 2001
From: Nick Moore <nick@zoic.org>
Date: Thu, 4 Apr 2019 20:27:25 +1100
Subject: [PATCH] Make some space for NVM adafruit/circuitpython#1042

---
 ports/nrf/boards/adafruit_nrf52840_s140_v6.ld |  1 -
 ports/nrf/common-hal/nvm/ByteArray.c          | 13 ++++++++++---
 ports/nrf/peripherals/nrf/nvm.c               |  5 ++---
 ports/nrf/supervisor/internal_flash.c         |  2 +-
 4 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/ports/nrf/boards/adafruit_nrf52840_s140_v6.ld b/ports/nrf/boards/adafruit_nrf52840_s140_v6.ld
index 8a700d6109..2587a19e34 100644
--- a/ports/nrf/boards/adafruit_nrf52840_s140_v6.ld
+++ b/ports/nrf/boards/adafruit_nrf52840_s140_v6.ld
@@ -11,7 +11,6 @@
 
     0x000ED000..0x000F3FFF (28KB ) Private Config Data (Bonding, Keys, etc.)
     0x000AD000..0x000ECFFF (256KB) User Filesystem
-
     0x00026000..0x000ACFFF (540KB) Application Code (including ISR vector)
     0x00001000..0x00025FFF (148KB) SoftDevice
     0x00000000..0x00000FFF   (4KB) Master Boot Record
diff --git a/ports/nrf/common-hal/nvm/ByteArray.c b/ports/nrf/common-hal/nvm/ByteArray.c
index d69abbdaca..ee270f79bb 100644
--- a/ports/nrf/common-hal/nvm/ByteArray.c
+++ b/ports/nrf/common-hal/nvm/ByteArray.c
@@ -31,8 +31,15 @@
 
 #include "peripherals/nrf/nvm.h"
 
+// defined in linker
+extern uint32_t __fatfs_flash_start_addr[];
+extern uint32_t __fatfs_flash_length[];
+
+#define NVM_START_ADDR ((uint32_t)__fatfs_flash_start_addr + \
+     (uint32_t)__fatfs_flash_length - CIRCUITPY_INTERNAL_NVM_SIZE)
+
 uint32_t common_hal_nvm_bytearray_get_length(nvm_bytearray_obj_t *self) {
-    return self->len;
+    return CIRCUITPY_INTERNAL_NVM_SIZE;
 }
 
 static void write_page(uint32_t page_addr, uint32_t offset, uint32_t len, uint8_t *bytes) {
@@ -52,7 +59,7 @@ static void write_page(uint32_t page_addr, uint32_t offset, uint32_t len, uint8_
 bool common_hal_nvm_bytearray_set_bytes(nvm_bytearray_obj_t *self,
         uint32_t start_index, uint8_t* values, uint32_t len) {
 
-    uint32_t address = self->start_address + start_index;
+    uint32_t address = NVM_START_ADDR + start_index;
     uint32_t offset = address % FLASH_PAGE_SIZE;
     uint32_t page_addr = address - offset;
 
@@ -69,5 +76,5 @@ bool common_hal_nvm_bytearray_set_bytes(nvm_bytearray_obj_t *self,
 
 void common_hal_nvm_bytearray_get_bytes(nvm_bytearray_obj_t *self,
     uint32_t start_index, uint32_t len, uint8_t* values) {
-    memcpy(values, (uint8_t *)(self->start_address + start_index), len);
+    memcpy(values, (uint8_t *)(NVM_START_ADDR + start_index), len);
 }
diff --git a/ports/nrf/peripherals/nrf/nvm.c b/ports/nrf/peripherals/nrf/nvm.c
index f9cc1b806a..d8fddc4dcf 100644
--- a/ports/nrf/peripherals/nrf/nvm.c
+++ b/ports/nrf/peripherals/nrf/nvm.c
@@ -25,7 +25,6 @@
  * THE SOFTWARE.
  */
 
-//#include "py/obj.h"
 #include "py/runtime.h"
 
 #include <stdio.h>
@@ -33,12 +32,12 @@
 
 #include "nrf_nvmc.h"
 
+#define FLASH_PAGE_SIZE (4096)
+
 #ifdef BLUETOOTH_SD
 #include "ble_drv.h"
 #include "nrf_sdm.h"
 
-#define FLASH_PAGE_SIZE (4096)
-
 STATIC void sd_flash_operation_start(void) {
     sd_flash_operation_status = SD_FLASH_OPERATION_IN_PROGRESS;
 }
diff --git a/ports/nrf/supervisor/internal_flash.c b/ports/nrf/supervisor/internal_flash.c
index 9aaaf9b5d1..016d970760 100644
--- a/ports/nrf/supervisor/internal_flash.c
+++ b/ports/nrf/supervisor/internal_flash.c
@@ -67,7 +67,7 @@ uint32_t supervisor_flash_get_block_size(void) {
 }
 
 uint32_t supervisor_flash_get_block_count(void) {
-    return ((uint32_t) __fatfs_flash_length) / FILESYSTEM_BLOCK_SIZE ;
+    return ((uint32_t) __fatfs_flash_length - CIRCUITPY_INTERNVAL_NVM_SIZE) / FILESYSTEM_BLOCK_SIZE ;
 }
 
 mp_uint_t supervisor_flash_read_blocks(uint8_t *dest, uint32_t block, uint32_t num_blocks) {