Added Flash programming stubs.

flashstub/README

@@ -0,0 +1,5 @@
+These are the assembler routines for executing a flash write
+on the supported targets.  They are kept here for reference, but
+are not used, as the compiled binary code is included in the 
+target drivers.
+

flashstub/lmi.s

@@ -0,0 +1,42 @@
+
+_start:
+	ldr r0, _flashbase
+	ldr r1, _addr
+	mov r2, pc
+	add r2, #(_data - . - 2)
+	ldr r3, _size
+	ldr r5, _flash_write_cmd
+_next:
+	cbz r3, _done
+	@ Write address to FMA
+	str r1, [r0]
+	@ Write data to FMD
+	ldr r4, [r2]
+	str r4, [r0, #4]
+	@ Write WRITE bit to FMC
+	str r5, [r0, #8]
+_wait:	@ Wait for WRITE bit to clear
+	ldr r4, [r0, #8]
+	mov r6, #1
+	tst r4, r6
+	bne _wait
+
+	sub r3, #1
+	add r1, #4
+	add r2, #4
+	b _next
+_done:
+	bkpt
+
+@.align 4
+.org 0x28
+_flashbase:
+	.word 0x400FD000
+_flash_write_cmd:
+	.word 0xA4420001
+_addr:
+	.word 0
+_size:
+	.word 4
+_data:
+	.string "Hello World!\n\0\0\0"

flashstub/stm32.s

@@ -0,0 +1,42 @@
+.global _start
+
+_start:
+	ldr r0, _flashbase
+	ldr r1, _addr
+	mov r2, pc
+	add r2, #(_data - . - 2)
+	ldr r3, _size
+	mov r5, #1
+_next:
+	cbz r3, _done
+	@ Write PG command to FLASH_CR
+	str r5, [r0, #0x10]
+	@ Write data to flash (half-word)
+	ldrh r4, [r2]
+	strh r4, [r1]
+
+_wait:	@ Wait for BSY bit to clear
+	ldr r4, [r0, #0x0C]
+	mov r6, #1
+	tst r4, r6
+	bne _wait
+
+	sub r3, #2
+	add r1, #2
+	add r2, #2
+	b _next
+_done:
+	bkpt
+
+@.align 4
+.org 0x28
+_flashbase:
+	.word 0x40022000
+_addr:
+	.word 0
+_size:
+	.word 12
+_data:
+	.word 0xAAAAAAAA
+	.word 0xBBBBBBBB
+	.word 0xCCCCCCCC