rp2/boards/PIMORONI_TINY2040: Add an 8MB variant to Tiny 2040.

Add an 8MB "PIMORONI_TINY2040" variant.

Signed-off-by: Phil Howard <phil@gadgetoid.com>

ports/rp2/boards/PIMORONI_TINY2040/board.json

@@ -16,5 +16,8 @@
     "product": "Tiny2040",
     "thumbnail": "",
     "url": "https://shop.pimoroni.com/products/tiny-2040",
+    "variants": {
+        "FLASH_8M": "8 MiB Flash"
+    },
     "vendor": "Pimoroni"
 }

ports/rp2/boards/PIMORONI_TINY2040/mpconfigboard.h

@@ -1,7 +1,9 @@
 // https://shop.pimoroni.com/products/tiny-2040
 
-#define MICROPY_HW_BOARD_NAME          "Pimoroni Tiny 2040"
-#define MICROPY_HW_FLASH_STORAGE_BYTES (7 * 1024 * 1024)
+#ifndef MICROPY_HW_BOARD_NAME
+#define MICROPY_HW_BOARD_NAME          "Pimoroni Tiny 2040 8MB"
+#endif
+#define MICROPY_HW_FLASH_STORAGE_BYTES (PICO_FLASH_SIZE_BYTES - (1 * 1024 * 1024))
 
 #define MICROPY_HW_USB_VID (0x16D0)
 #define MICROPY_HW_USB_PID (0x08C7)
@@ -9,10 +11,3 @@
 // I2C0 (non-default)
 #define MICROPY_HW_I2C0_SCL  (4)
 #define MICROPY_HW_I2C0_SDA  (5)
-
-// RGB LED, active low
-// Red LED 18
-// Green LED 19
-// Blue LED 20
-
-// Boot button GPIO23

ports/rp2/boards/PIMORONI_TINY2040/mpconfigvariant.cmake

@@ -0,0 +1,6 @@
+set(PICO_BOARD "pimoroni_tiny2040_2mb")
+
+# Override the MicroPython board name
+list(APPEND MICROPY_DEF_BOARD
+    MICROPY_HW_BOARD_NAME="Pimoroni Tiny 2040 2MB"
+)

ports/rp2/boards/PIMORONI_TINY2040/mpconfigvariant_FLASH_8M.cmake

@@ -0,0 +1,6 @@
+set(PICO_BOARD "pimoroni_tiny2040")
+
+# Override the MicroPython board name
+list(APPEND MICROPY_DEF_BOARD
+    MICROPY_HW_BOARD_NAME="Pimoroni Tiny 2040 8MB"
+)

ports/rp2/boards/PIMORONI_TINY2040/pins.csv

@@ -1 +1,17 @@
+GP0,GPIO0
+GP1,GPIO1
+GP2,GPIO2
+GP3,GPIO3
+GP4,GPIO4
+GP5,GPIO5
+GP6,GPIO6
+GP7,GPIO7
+LED_RED,GPIO18
+LED_GREEN,GPIO19
+LED_BLUE,GPIO20
+BOOT,GPIO23
+GP26,GPIO26
+GP27,GPIO27
+GP28,GPIO28
+GP29,GPIO29
 LED,GPIO19