nvidia/cbootimage: avoid upstream's build system

It brings in useless dependencies, a weird autotools
configuration, and tons of pain everywhere.

Instead just build things ourselves.

Change-Id: I67f06e711cb9dcd594363bc1a4f99d3273074549
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/6986
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

.gitmodules

@@ -4,5 +4,5 @@
 	update = none
 	ignore = dirty
 [submodule "util/nvidia-cbootimage"]
-	path = util/nvidia-cbootimage
+	path = util/nvidia/cbootimage
 	url = ../nvidia-cbootimage.git

Makefile.inc

@@ -308,14 +308,7 @@ $(FLETCHER): $(top)/util/fletcher/fletcher.c
 
 CBOOTIMAGE:=$(objutil)/cbootimage/cbootimage
 
-$(CBOOTIMAGE): $(top)/util/nvidia-cbootimage/Makefile
-	@printf "    MAKE     $(subst $(obj)/,,$(@))\n"
-	$(MAKE) -C $(top)/util/nvidia-cbootimage
-	cp $(top)/util/nvidia-cbootimage/src/cbootimage $@
-
-$(top)/util/nvidia-cbootimage/Makefile:
-	cd $(top)/util/nvidia-cbootimage/; \
-	./autogen.sh >/dev/null
+subdirs-y += util/nvidia
 
 #######################################################################
 # needed objects that every mainboard uses

util/nvidia/Makefile.inc

@@ -0,0 +1,48 @@
+# copied from cbootimage/src/Makefile.am
+CBOOTIMAGE_RAW_SRCS:= \
+	cbootimage.c \
+	data_layout.c \
+	set.c \
+	crypto.c \
+	aes_ref.c \
+	context.c \
+	parse.c \
+	t132/parse_t132.c \
+	t124/parse_t124.c \
+	t114/parse_t114.c \
+	t30/parse_t30.c \
+	t20/parse_t20.c \
+	t132/nvbctlib_t132.c \
+	t124/nvbctlib_t124.c \
+	t114/nvbctlib_t114.c \
+	t30/nvbctlib_t30.c \
+	t20/nvbctlib_t20.c \
+	cbootimage.h \
+	context.h \
+	crypto.h \
+	data_layout.h \
+	nvaes_ref.h \
+	parse.h \
+	set.h \
+	t20/nvboot_bct_t20.h \
+	t20/nvboot_sdram_param_t20.h \
+	t30/nvboot_bct_t30.h \
+	t30/nvboot_sdram_param_t30.h \
+	t114/nvboot_bct_t114.h \
+	t114/nvboot_sdram_param_t114.h \
+	t124/nvboot_bct_t124.h \
+	t124/nvboot_sdram_param_t124.h \
+	t132/nvboot_bct_t132.h \
+	t132/nvboot_sdram_param_t132.h
+
+CBOOTIMAGE_SRCS:=$(addprefix util/nvidia/cbootimage/src/,$(filter %.c,$(CBOOTIMAGE_RAW_SRCS)))
+CBOOTIMAGE_OBJS:=$(addprefix $(objutil)/nvidia/cbootimage/,$(patsubst %.c,%.o,$(filter %.c,$(CBOOTIMAGE_RAW_SRCS))))
+
+additional-dirs += $(sort $(dir $(CBOOTIMAGE_OBJS)))
+
+$(objutil)/nvidia/cbootimage/%.o: util/nvidia/cbootimage/src/%.c
+	gcc -c -o $@ $<
+
+$(CBOOTIMAGE): $(CBOOTIMAGE_OBJS)
+	gcc -o $@.tmp $^ -lm
+	mv $@.tmp $@