add elf2flt, use it for m68k-nommu. bootup in qemu still fails.

mk/vars.mk

@@ -93,6 +93,12 @@ TARGET_LDFLAGS:=	-L$(STAGING_TARGET_DIR)/lib -L$(STAGING_TARGET_DIR)/usr/lib \
 			-Wl,-O1 -Wl,-rpath -Wl,/usr/lib \
 			-Wl,-rpath-link -Wl,${STAGING_TARGET_DIR}/usr/lib
 
+ifeq ($(ADK_TARGET_BINFMT_FLAT),y)
+TARGET_CFLAGS+=		-Wl,-elf2flt
+TARGET_CXXFLAGS+=	-Wl,-elf2flt
+TARGET_LDFLAGS+=	-elf2flt
+endif
+
 ifeq ($(ADK_TARGET_LIB_MUSL),y)
 # use -static-libgcc by default only for musl
 TARGET_CFLAGS+=		-static-libgcc

package/elf2flt/Makefile

@@ -0,0 +1,53 @@
+# This file is part of the OpenADK project. OpenADK is copyrighted
+# material, please see the LICENCE file in the top-level directory.
+
+include $(ADK_TOPDIR)/rules.mk
+
+PKG_NAME:=		elf2flt
+PKG_VERSION:=		20140814
+PKG_RELEASE:=		1
+PKG_MD5SUM:=		be5c918b90a591d3d4037580cda1764a
+PKG_DESCR:=		elf2flt utility
+PKG_SECTION:=		dev/tools
+PKG_SITES:=		http://www.openadk.org/distfiles/
+BINUTILS_VERSION:=	2.24
+
+PKG_CFLINE_ELF2FLT:=	depends on ADK_HOST_ONLY
+PKG_DFLT_ELF2FLT:=	y if ADK_TARGET_BINFMT_FLAT
+
+include $(ADK_TOPDIR)/mk/host.mk
+include $(ADK_TOPDIR)/mk/package.mk
+
+$(eval $(call HOST_template,ELF2FLT,elf2flt,$(PKG_VERSION)-${PKG_RELEASE}))
+
+HOST_STYLE:=		manual
+
+host-configure:
+	(cd $(WRKBUILD); ./configure --prefix=$(STAGING_HOST_DIR)/usr \
+			--target=$(ADK_TARGET_ARCH) \
+			--with-bfd-include-dir=$(TOOLCHAIN_BUILD_DIR)/w-binutils-${BINUTILS_VERSION}-1/binutils-${BINUTILS_VERSION}/bfd \
+			--with-binutils-include-dir=$(TOOLCHAIN_BUILD_DIR)/w-binutils-${BINUTILS_VERSION}-1/binutils-${BINUTILS_VERSION}/include \
+			--with-libbfd=$(TOOLCHAIN_BUILD_DIR)/w-binutils-${BINUTILS_VERSION}-1/binutils-${BINUTILS_VERSION}/bfd/libbfd.a \
+			--with-libiberty=$(TOOLCHAIN_BUILD_DIR)/w-binutils-${BINUTILS_VERSION}-1/binutils-${BINUTILS_VERSION}/libiberty/libiberty.a )
+
+host-build:
+	(cd ${WRKBUILD} && env ${HOST_MAKE_ENV} ${MAKE} -f ${MAKE_FILE} \
+		${HOST_MAKE_FLAGS} ${HOST_ALL_TARGET}) $(MAKE_TRACE)
+
+elf2flt-hostinstall:
+	${INSTALL_BIN} ${WRKBUILD}/elf2flt ${TOOLCHAIN_DIR}/usr/$(GNU_TARGET_NAME)/bin
+	${INSTALL_BIN} ${WRKBUILD}/flthdr ${TOOLCHAIN_DIR}/usr/$(GNU_TARGET_NAME)/bin
+	${INSTALL_BIN} ${WRKBUILD}/ld-elf2flt ${TOOLCHAIN_DIR}/usr/$(GNU_TARGET_NAME)/bin
+	${INSTALL_DATA} ${WRKBUILD}/elf2flt.ld ${TOOLCHAIN_DIR}/usr/$(GNU_TARGET_NAME)/lib
+	rm $(TOOLCHAIN_DIR)/usr/bin/$(GNU_TARGET_NAME)-ld
+	(cd ${TOOLCHAIN_DIR}/usr/$(GNU_TARGET_NAME)/bin && \
+		ln -sf ld.bfd ld.real )
+	(cd $(TOOLCHAIN_DIR)/usr/bin && \
+		ln -sf ../$(GNU_TARGET_NAME)/bin/elf2flt $(GNU_TARGET_NAME)-elf2flt && \
+		ln -sf ../$(GNU_TARGET_NAME)/bin/flthdr $(GNU_TARGET_NAME)-flthdr && \
+		ln -sf ../$(GNU_TARGET_NAME)/bin/ld-elf2flt $(GNU_TARGET_NAME)-ld-elf2flt && \
+		ln -sf ../$(GNU_TARGET_NAME)/bin/ld-elf2flt $(GNU_TARGET_NAME)-ld )
+	(cd $(TOOLCHAIN_DIR)/usr/bin/ && ln -sf $(GNU_TARGET_NAME)-ld.bfd $(GNU_TARGET_NAME)-ld.real )
+
+include ${ADK_TOPDIR}/mk/host-bottom.mk
+include ${ADK_TOPDIR}/mk/pkg-bottom.mk

target/config/Config.in.target

@@ -283,6 +283,9 @@ config ADK_TARGET_PACKAGE_IPKG
 	  
 endchoice
 
+config ADK_TARGET_BINFMT_FLAT
+	boolean
+
 choice
 prompt "Target GPU Memory"
 depends on ADK_TARGET_SYSTEM_RASPBERRY_PI

target/linux/patches/3.15.8/qemu-coldfire.patch

@@ -0,0 +1,24 @@
+m68k: enabled software emulation of separate supervisor/user stack
+
+Recent Coldfires have separate supervisor and user stack pointers, but
+since older Coldfires didn't have that, the Linux kernel has a kind of
+emulation mechanism for those pointers.
+
+Apparently, according to the Kconfig.cpu file, the 5208 is supposed to
+support such separate pointers, but Qemu doesn't implement it. So we
+cheat a bit here and force the usage of emulated separate stack
+pointers.
+
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
+
+diff -Nur linux-3.16.orig/arch/m68k/Kconfig.cpu linux-3.16/arch/m68k/Kconfig.cpu
+--- linux-3.16.orig/arch/m68k/Kconfig.cpu	2014-08-04 00:25:02.000000000 +0200
++++ linux-3.16/arch/m68k/Kconfig.cpu	2014-08-13 16:58:59.568332805 +0200
+@@ -146,6 +146,7 @@
+ 	depends on !MMU
+ 	select GENERIC_CLOCKEVENTS
+ 	select HAVE_CACHE_SPLIT
++	select COLDFIRE_SW_A7
+ 	help
+ 	   Freescale Coldfire 5207/5208 processor support.
+ 

target/m68k/kernel/qemu-m68k

@@ -15,7 +15,8 @@ CONFIG_VECTORBASE=0x40000000
 CONFIG_KERNELBASE=0x40010000
 CONFIG_RAMAUTOBIT=y
 CONFIG_BINFMT_FLAT=y
-CONFIG_SERIAL_COLDFIRE=y
+CONFIG_BINFMT_ZFLAT=y
+CONFIG_BINFMT_SHARED_FLAT=y
 CONFIG_SERIAL_MCF=y
 CONFIG_SERIAL_MCF_BAUDRATE=19200
 CONFIG_SERIAL_MCF_CONSOLE=y

target/m68k/systems/qemu-m68k

@@ -5,6 +5,7 @@ config ADK_TARGET_SYSTEM_QEMU_M68K
 	select ADK_CPU_CF_5208
 	select ADK_TARGET_QEMU
 	select ADK_TARGET_UCLINUX
+	select ADK_TARGET_BINFMT_FLAT
 	select ADK_TARGET_KERNEL_ZIMAGE
 	help
 	 Support for Qemu Emulator M68K/Coldfire without MMU.