Add autotools configuration.

This patch adds a basic auto-tools configuration environment for the
bootwrapper consisting of the configure.ac file and the Makefile.am
file.

The configure.ac file includes several options and checks:
  - Ensure that an AArch64 compiler is used.
  - Add the mandatory --with-kernel-dir option that sets KERN_DIR.
  - Check that the correct base dtb file exists in KERN_DIR.
  - Add an option, --with-initrd, that allows a user to specify an
    initrd file to embed in the image.
  - Check for a working dtc and set DTC to the full-path to the
    executable.
  - Create the necessary symbolic links to the relevant kernel files.

The Makefile.am file includes several changes:

- Use a prebuilt dtb rather than a dts, which is decompiled to inject
  the chosen node.
- Use the configured compiler tool names.
- Use the configured SED program rather than assuming it is in PATH.

Signed-off-by: Matthew Leach <matthew.leach@arm.com>
[Mark: use dtb, add options, fix style issues, remove src/]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>

1 files changed, 73 insertions, 0 deletions

diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..fd66c8c
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,73 @@
+#
+# Makefile.am - build a kernel+filesystem image for stand-alone Linux
+# booting
+#
+# Copyright (C) 2012 ARM Limited. All rights reserved.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE.txt file.
+
+# VE
+PHYS_OFFSET	:= 0x80000000
+UART_BASE	:= 0x1c090000
+SYSREGS_BASE	:= 0x1c010000
+GIC_DIST_BASE	:= 0x2c001000
+GIC_CPU_BASE	:= 0x2c002000
+CNTFRQ		:= 0x01800000	# 24Mhz
+CPU_IDS		?= 0x0,0x1,0x2,0x3
+
+DEFINES		= -DCNTFRQ=$(CNTFRQ)
+DEFINES		+= -DCPU_IDS=$(CPU_IDS)
+DEFINES		+= -DGIC_CPU_BASE=$(GIC_CPU_BASE)
+DEFINES		+= -DGIC_DIST_BASE=$(GIC_DIST_BASE)
+DEFINES		+= -DSYSREGS_BASE=$(SYSREGS_BASE)
+DEFINES		+= -DUART_BASE=$(UART_BASE)
+
+BOOTLOADER	:= boot.S
+BOOTMETHOD	:= psci.o
+MBOX_OFFSET	:= 0xfff8
+KERNEL_OFFSET	:= 0x80000
+LD_SCRIPT	:= model.lds.S
+IMAGE		:= linux-system.axf
+
+FS_OFFSET	:= 0x10000000
+FILESYSTEM_START:= $(shell echo $$(($(PHYS_OFFSET) + $(FS_OFFSET))))
+FILESYSTEM_SIZE	:= $(shell stat -Lc %s $(FILESYSTEM) 2>/dev/null || echo 0)
+FILESYSTEM_END	:= $(shell echo $$(($(FILESYSTEM_START) + $(FILESYSTEM_SIZE))))
+
+FDT_OFFSET	:= 0x08000000
+
+if INITRD
+INITRD_FLAGS	:= -DUSE_INITRD
+CHOSEN_NODE	:= chosen {						\
+			bootargs = \"$(CMDLINE)\";			\
+			linux,initrd-start = <$(FILESYSTEM_START)>;	\
+			linux,initrd-end = <$(FILESYSTEM_END)>;		\
+		   };
+else
+INITRD_FLAGS	:=
+CHOSEN_NODE	:= chosen {						\
+			bootargs = \"$(CMDLINE)\";			\
+		   };
+endif
+
+CPPFLAGS	+= $(INITRD_FLAGS)
+
+all: $(IMAGE)
+
+CLEANFILES = $(IMAGE) boot.o cache.o gic.o mmu.o ns.o $(BOOTMETHOD) model.lds fdt.dtb
+
+$(IMAGE): boot.o cache.o gic.o mmu.o ns.o $(BOOTMETHOD) model.lds fdt.dtb $(KERNEL_IMAGE) $(FILESYSTEM)
+	$(LD) -o $@ --script=model.lds
+
+%.o: %.S Makefile
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(DEFINES) -c -o $@ $<
+
+model.lds: $(LD_SCRIPT) Makefile
+	$(CPP) $(CPPFLAGS) -ansi -DPHYS_OFFSET=$(PHYS_OFFSET) -DMBOX_OFFSET=$(MBOX_OFFSET) -DKERNEL_OFFSET=$(KERNEL_OFFSET) -DFDT_OFFSET=$(FDT_OFFSET) -DFS_OFFSET=$(FS_OFFSET) -DKERNEL=$(KERNEL_IMAGE) -DFILESYSTEM=$(FILESYSTEM) -DBOOTMETHOD=$(BOOTMETHOD) -P -C -o $@ $<
+
+fdt.dtb: $(KERNEL_DTB) Makefile
+	( $(DTC) -O dts -I dtb $(KERNEL_DTB) ; echo "/ { $(CHOSEN_NODE) };" ) | $(DTC) -O dtb -o $@ -
+
+# The filesystem archive might not exist if INITRD is not being used
+.PHONY: all clean $(FILESYSTEM)