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-rw-r--r--flashstub/lmi.s42
1 files changed, 42 insertions, 0 deletions
diff --git a/flashstub/lmi.s b/flashstub/lmi.s
new file mode 100644
index 0000000..b3b206e
--- /dev/null
+++ b/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"