armv4_5: Integrate build of erase check code

Add rules to build armv4_5_erase_check.inc, and convert the code to
target endianness the least intrusive way.

Drop an unused word from the assembler sources to make the ARM bytecode
fully match that of armv4_5.c and to not break ARMv4 assumptions.

This completes the build rules for contrib/loaders/erase_check directory.

Change-Id: I36be7a944e26142088195fa3fb072d4e577bf328
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-on: http://openocd.zylin.com/3135
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

contrib/loaders/erase_check/Makefile

@@ -4,7 +4,16 @@ ARM_CROSS_COMPILE ?= arm-none-eabi-
 ARM_AS      ?= $(ARM_CROSS_COMPILE)as
 ARM_OBJCOPY ?= $(ARM_CROSS_COMPILE)objcopy
 
-arm: armv7m_erase_check.inc armv7m_0_erase_check.inc
+arm: armv4_5_erase_check.inc armv7m_erase_check.inc armv7m_0_erase_check.inc
+
+armv4_5_%.elf: armv4_5_%.s
+	$(ARM_AS) $< -o $@
+
+armv4_5_%.bin: armv4_5_%.elf
+	$(ARM_OBJCOPY) -Obinary $< $@
+
+armv4_5_%.inc: armv4_5_%.bin
+	$(BIN2C) < $< > $@
 
 armv7m_%.elf: armv7m_%.s
 	$(ARM_AS) $< -o $@

contrib/loaders/erase_check/armv4_5_erase_check.inc

@@ -0,0 +1,3 @@
+/* Autogenerated with ../../../src/helper/bin2char.sh */
+0x01,0x30,0xd0,0xe4,0x03,0x20,0x02,0xe0,0x01,0x10,0x51,0xe2,0xfb,0xff,0xff,0x1a,
+0x70,0x00,0x20,0xe1,

contrib/loaders/erase_check/armv4_5_erase_check.s

@@ -36,6 +36,4 @@ loop:
 end:
 	bkpt	#0
 
-CRC32XOR:	.word	0x04c11db7
-
 	.end