Initial commit for the Sony NWZ linux port

SUPPORTED SERIES:
- NWZ-E450
- NWZ-E460
- NWZ-E470
- NWZ-E580
- NWZ-A10

NOTES:
- bootloader makefile convert an extra font to be installed alongside the bootloader
  since sysfont is way too small
- the toolsicon bitmap comes from the Oxygen iconset
- touchscreen driver is untested

TODO:
- implement audio routing driver (pcm is handled by pcm-alsa)
- fix playback: it crashes on illegal instruction in DEBUG builds
- find out why the browser starts at / instead of /contents
- implement radio support
- implement return to OF for usb handling
- calibrate battery curve (NB: of can report a battery level on a 0-5 scale but
  probabl don't want to use that ?)
- implement simulator build (we need a nice image of the player)
- figure out if we can detect jack removal

POTENTIAL TODOS:
- try to build a usb serial gadget and gdbserver

Change-Id: Ic77d71e0651355d47cc4e423a40fb64a60c69a80

rbutil/mknwzboot/Makefile

@@ -0,0 +1,35 @@
+#             __________               __   ___.
+#   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+#   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+#   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+#   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+#                     \/            \/     \/    \/            \/
+
+# We use the SB code available in the Rockbox utils/sbtools directory
+UPGTOOLS_DIR=../../utils/nwztools/upgtools/
+CFLAGS += -I$(UPGTOOLS_DIR) -Wall
+# std=gnu99 is required by MinGW on Windows (c99 is sufficient for Linux / MXE)
+CFLAGS += -std=gnu99 -g -O3
+# dependencies
+# FIXME make it work for windows and maybe embed crypto++
+LDOPTS += `pkg-config --libs libcrypto++`
+
+OUTPUT = mknwzboot
+
+# inputs for lib
+UPGTOOLS_SOURCES = misc.c upg.c fwp.c mg.cpp md5.cpp
+LIBSOURCES := mknwzboot.c install_script.c \
+	      $(addprefix $(UPGTOOLS_DIR),$(UPGTOOLS_SOURCES))
+# inputs for binary only
+SOURCES := $(LIBSOURCES) main.c
+# dependencies for binary
+EXTRADEPS := 
+
+include ../libtools.make
+
+install_script.c install_script.h: install_script.sh $(BIN2C)
+	$(BIN2C) install_script.sh install_script
+
+# explicit dependencies on install_script.{c,h} and mknwzboot.h
+$(OBJDIR)mknwzboot.o: install_script.h install_script.c mknwzboot.h
+$(OBJDIR)main.o: install_script.h install_script.c main.c mknwzboot.h