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diff --git a/ports/beagleboneblack/gp_header.S b/ports/beagleboneblack/gp_header.S
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+ .file "gp_header.S"
+
+/* This GP header is prepended to uMon images when booting from non-XIP devices (e.g. SD).
+ * Refer to the AM335x TRM, Section 26.1.9 for more information.
+ */
+ .word BIN_SIZE + 8
+ .word 0x402f0400