I've just noticed that omitting all options from the compilation alters
the binary. With the options explicitly listed in fel-sdboot.c, I get this:
sunxi-tools # armv7a-hardfloat-linux-gnueabi-gcc -g -Os -fno-common
-ffixed-r8 -msoft-float -fno-builtin -ffreestanding -nostdinc
-mno-thumb-interwork -Wall -Wstrict-prototypes -fno-stack-protector
-Wno-format-nonliteral -Wno-format-security -fno-toplevel-reorder
fel-sdboot.c -c
sunxi-tools # armv7a-hardfloat-linux-gnueabi-objdump -d fel-sdboot.o
fel-sdboot.o: file format elf32-littlearm
Disassembly of section .text:
00000000 <_start>:
0: e92d4008 push {r3, lr}
4: e59f3004 ldr r3, [pc, #4] ; 10 <_start+0x10>
8: e12fff33 blx r3
c: e8bd8008 pop {r3, pc}
10: ffff0020 .word 0xffff0020
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