first boot in qemu works now.

target/linux/config/Config.in.ethernet

@@ -58,8 +58,10 @@ config ADK_KERNEL_FEC
 	tristate
 	select ADK_KERNEL_NET_VENDOR_FREESCALE
 	select ADK_KERNEL_AT803X_PHY
-	depends on ADK_TARGET_SYSTEM_CUBOX_I
+	depends on ADK_TARGET_SYSTEM_CUBOX_I || \
+		   ADK_TARGET_SYSTEM_QEMU_M68K
 	default y if ADK_TARGET_SYSTEM_CUBOX_I
+	default y if ADK_TARGET_SYSTEM_QEMU_M68K
 	default n
 	help
 	  FEC ethernet driver

target/linux/patches/3.16/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

@@ -3,14 +3,21 @@ CONFIG_COLDFIRE=y
 CONFIG_M520x=y
 # CONFIG_MMU is not set
 CONFIG_CLOCK_SET=y
-CONFIG_CLOCK_FREQ=166666666
+CONFIG_CLOCK_FREQ=66666666
+CONFIG_CLOCK_DIV=1
 CONFIG_M5208EVB=y
+CONFIG_FREESCALE=y
+CONFIG_LARGE_ALLOCS=y
+CONFIG_4KSTACKS=y
 CONFIG_RAMBASE=0x40000000
-CONFIG_RAMSIZE=0x2000000
+CONFIG_RAMSIZE=0x0
 CONFIG_VECTORBASE=0x40000000
-CONFIG_KERNELBASE=0x40020000
+CONFIG_KERNELBASE=0x40010000
+CONFIG_RAMAUTOBIT=y
 CONFIG_BINFMT_FLAT=y
+CONFIG_SERIAL_COLDFIRE=y
 CONFIG_SERIAL_MCF=y
-CONFIG_SERIAL_MCF_BAUDRATE=115200
+CONFIG_SERIAL_MCF_BAUDRATE=19200
 CONFIG_SERIAL_MCF_CONSOLE=y
-
+CONFIG_BOOTPARAM=y
+CONFIG_BOOTPARAM_STRING="console=ttyS0,19200"