got the startup setup for both the bootloader and main code figured out
diff --git a/bbb_cape/src/cape/bootloader.c b/bbb_cape/src/cape/bootloader.c
index c429f38..4a161be 100644
--- a/bbb_cape/src/cape/bootloader.c
+++ b/bbb_cape/src/cape/bootloader.c
@@ -1,2 +1,19 @@
+#include <stdint.h>
+
+#include "cape/bootloader_handoff.h"
+
+// Sets everything up and then jumps to the main code.
+static void jump_to_main(void) __attribute__((noreturn));
+static void jump_to_main(void) {
+ // 0x20008000
+ __asm__ volatile(
+ "mov sp, %[stack]\n\t"
+ "bx %[reset]" : :
+ [stack]"r"(RAM_START + RAM_SIZE), [reset]"r"(MAIN_FLASH_START | 1)
+ : "memory");
+ __builtin_unreachable();
+}
+
void _start(void) {
+ jump_to_main();
}