C version of JTAG loop hack

jtag-loop.c

+/*
+ * (C) Copyright 2012 Jens Andersen <jens.andersen@gmail.com>
+ * (C) Copyright 2012 Henrik Nordstrom <henrik@henriknordstrom.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+
+Build instructions:
+
+arm-none-linux-gnueabi-gcc  -g -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 -Os jtag-loop.c -c
+
+arm-none-linux-gnueabi-objcopy -O binary fel-loop.o fel-loop.bin
+
+mksunxiboot fel-loop.bin fel-loop.sunxi
+*/
+
+void _start(void)
+{
+	*(volatile unsigned long *)0x01c208b4 = 0x00444444;
+	while(1);
+}