boards: Add support for the apollo3

Signed-off-by: Alistair Francis <alistair@alistair23.me>

Makefile

diff --git a/Makefile b/Makefile
index 1467c1a..f1f6dd5 100644
--- a/Makefile
+++ b/Makefile
@@ -59,6 +59,14 @@
 analyse-stack-sizes:
 	cargo stack-sizes $(release) --example $(EXAMPLE) $(features) -- -Z emit-stack-sizes
 
+.PHONY: apollo3
+apollo3:
+	PLATFORM=apollo3 cargo build $(release) --target=thumbv7em-none-eabi --examples $(features)
+
+.PHONY: flash-apollo3
+flash-apollo3:
+	PLATFORM=apollo3 cargo run $(release) --target=thumbv7em-none-eabi --example $(EXAMPLE) $(features)
+
 .PHONY: hail
 hail:
 	PLATFORM=hail cargo build $(release) --target=thumbv7em-none-eabi --examples $(features)

boards/layout_apollo3.ld

diff --git a/boards/layout_apollo3.ld b/boards/layout_apollo3.ld
new file mode 100644
index 0000000..95fde33
--- /dev/null
+++ b/boards/layout_apollo3.ld
@@ -0,0 +1,17 @@
+/* Layout for the Apollo3 MCU, used by the examples in this repository. */
+
+MEMORY {
+  /* The application region is 64 bytes (0x40) */
+  FLASH (rx) : ORIGIN = 0x00040040, LENGTH = 0x0005FFC0
+  SRAM (rwx) : ORIGIN = 0x10002000, LENGTH = 0x2000
+}
+
+/*
+ * Any change to STACK_SIZE should be accompanied by a corresponding change to
+ * `elf2tab`'s `--stack` option
+ */
+STACK_SIZE = 2048;
+
+MPU_MIN_ALIGN = 8K;
+
+INCLUDE layout_generic.ld

tools/flash.sh

diff --git a/tools/flash.sh b/tools/flash.sh
index 7f4c4ea..f24127e 100755
--- a/tools/flash.sh
+++ b/tools/flash.sh
@@ -15,6 +15,11 @@
 fi
 
 case "${PLATFORM}" in
+    "apollo3")
+        tockloader_flags=""
+        binary_name=cortex-m4.elf
+        tockload=n
+        ;;
     "nrf52"|"nrf52840")
         tockloader_flags="--jlink --arch cortex-m4 --board nrf52dk --jtag-device nrf52"
         binary_name=cortex-m4.elf