optimize for really small systems

Default to busybox hush for noMMU systems.
Add busybox profiles to choose a minimal busybox
config for noMMU systems.
Add gdb git from ysato for h8/300 simulator.

Change some kernel defaults to off to have a really
small kernel.

For bfin simulator the kernel+initramfs is smaller then
2MB in size.

7 files changed, 31 insertions, 40 deletions

diff --git a/target/config/Config.in.gdb b/target/config/Config.in.gdb
index e151f1aa0..79d20dd67 100644
--- a/target/config/Config.in.gdb
+++ b/target/config/Config.in.gdb
@@ -4,12 +4,18 @@
 choice
 prompt "GNU debugger version"
 default ADK_TOOLCHAIN_GDB_7_9_1 if ADK_TARGET_ARCH_BFIN
+default ADK_TOOLCHAIN_GDB_H8300_GIT if ADK_TARGET_ARCH_H8300
 default ADK_TOOLCHAIN_GDB_7_10_1
 
 config ADK_TOOLCHAIN_GDB_GIT
 	bool "git"
 	depends on !ADK_TARGET_ARCH_AVR32
 	depends on !ADK_TARGET_ARCH_BFIN
+	depends on !ADK_TARGET_ARCH_H8300
+
+config ADK_TOOLCHAIN_GDB_H8300_GIT
+	bool "h8300-git"
+	depends on ADK_TARGET_ARCH_H8300
 
 config ADK_TOOLCHAIN_GDB_7_10_1
 	bool "7.10.1"
diff --git a/target/config/Config.in.runtime b/target/config/Config.in.runtime
index b4fe068c8..8bcef7fb7 100644
--- a/target/config/Config.in.runtime
+++ b/target/config/Config.in.runtime
@@ -10,7 +10,6 @@ config ADK_RUNTIME_HOSTNAME
 choice
 prompt "init"
 depends on !ADK_TOOLCHAIN_ONLY
-default ADK_RUNTIME_INIT_SIMPLEINIT if ADK_TARGET_WITHOUT_MMU
 default ADK_RUNTIME_INIT_SYSV
 
 config ADK_RUNTIME_INIT_SYSV
@@ -112,7 +111,7 @@ config ADK_RUNTIME_TMPFS_SIZE
 	default "32768" if ADK_TARGET_SYSTEM_RASPBERRY_PI2
 	default "32768" if ADK_TARGET_SYSTEM_SOLIDRUN_IMX6
 	default "8192" if ADK_TARGET_SYSTEM_MIKROTIK_RB532
-	default "2048"
+	default "1024"
 	depends on !ADK_RUNTIME_INIT_SIMPLEINIT
 	help
 	  Size of /tmp in memory in Kilobyte.
@@ -290,7 +289,7 @@ config ADK_RUNTIME_KBD_LAYOUT
 
 choice
 prompt "initial login shell for the root user"
-default ADK_ROOTSH_SASH if ADK_TARGET_WITHOUT_MMU
+default ADK_ROOTSH_HUSH if ADK_TARGET_WITHOUT_MMU
 default ADK_ROOTSH_MKSH
 
 config ADK_ROOTSH_MKSH
@@ -300,19 +299,19 @@ config ADK_ROOTSH_MKSH
 	  Use mksh (a Korn Shell variant) as standard login shell
 	  for the superuser.
 
+config ADK_ROOTSH_HUSH
+	bool "hush (busybox shell compatible with non-MMU systems)"
+	select BUSYBOX_HUSH if !ADK_TOOLCHAIN_ONLY
+	select BUSYBOX_FEATURE_SH_IS_HUSH if !ADK_TOOLCHAIN_ONLY
+	help
+	  hush shell from busybox.
+
 config ADK_ROOTSH_SASH
 	bool "sash (Shell compatible with non-MMU systems)"
 	select ADK_PACKAGE_SASH if !ADK_TOOLCHAIN_ONLY
 	help
 	  standalone shell.
 
-config ADK_ROOTSH_HUSH
-	bool "hush (busybox shell compatible with non-MMU systems)"
-	select BUSYBOX_HUSH
-	select BUSYBOX_FEATURE_SH_IS_HUSH
-	help
-	  hush shell from busybox.
-
 config ADK_ROOTSH_ASH
 	bool "ash (busybox shell)"
 	select BUSYBOX_ASH
@@ -345,7 +344,7 @@ endchoice
 
 choice
 prompt "system /bin/sh (POSIX script shell)"
-default ADK_BINSH_SASH if ADK_TARGET_WITHOUT_MMU
+default ADK_BINSH_HUSH if ADK_TARGET_WITHOUT_MMU
 default ADK_BINSH_MKSH
 
 config ADK_BINSH_MKSH
@@ -355,18 +354,18 @@ config ADK_BINSH_MKSH
 	  Use mksh (a Korn Shell variant) as system shell, which is
 	  both small and powerful, so quite suited for this task.
 
+config ADK_BINSH_HUSH
+	bool "hush (busybox)"
+	select ADK_PACKAGE_HUSH if !ADK_TOOLCHAIN_ONLY
+	help
+	  hush shell.
+
 config ADK_BINSH_SASH
 	bool "sash (Standalone Shell)"
 	select ADK_PACKAGE_SASH if !ADK_TOOLCHAIN_ONLY
 	help
 	  sash shell.
 
-config ADK_BINSH_HUSH
-	bool "hush (busybox)"
-	select ADK_PACKAGE_HUSH
-	help
-	  hush shell.
-
 config ADK_BINSH_ASH
 	bool "ash (busybox)"
 	select BUSYBOX_ASH
diff --git a/target/config/Config.in.target b/target/config/Config.in.target
index 4f8b95c04..4bf725e74 100644
--- a/target/config/Config.in.target
+++ b/target/config/Config.in.target
@@ -29,6 +29,7 @@ config ADK_TARGET_ROOTFS_INITRAMFS
 		ADK_TARGET_ARCH_X86_64
 	depends on !ADK_TARGET_VBOX
 	depends on !ADK_TARGET_SYSTEM_MIKROTIK_RB532
+	depends on !ADK_TARGET_SYSTEM_QEMU_M68K_MCF5208
 	select ADK_KERNEL_BLK_DEV_INITRD
 	help
 	  create an read-only initramfs system.
@@ -135,6 +136,7 @@ config ADK_TARGET_ROOTFS_ISO
 config ADK_TARGET_ROOTFS_INITRAMFSARCHIVE
 	bool "Archive usable for initramfs creation"
 	depends on !ADK_TARGET_SYSTEM_MIKROTIK_RB532 \
+		&& !ADK_TARGET_SYSTEM_QEMU_M68K_MCF5208 \
 		&& !ADK_TARGET_SIM
 	select ADK_KERNEL_BLK_DEV_INITRD
 	help
@@ -144,7 +146,8 @@ config ADK_TARGET_ROOTFS_ARCHIVE
 	bool "Archive usable for different filesystems"
 	select ADK_HOST_NEED_GENEXT2FS if ADK_TARGET_QEMU || ADK_TARGET_VBOX
 	select ADK_KERNEL_EXT2_FS if ADK_TARGET_QEMU || ADK_TARGET_VBOX
-	depends on !ADK_TARGET_SIM
+	depends on !ADK_TARGET_SIM \
+		&& !ADK_TARGET_SYSTEM_QEMU_M68K_MCF5208
 	help
 	  Use this option if your root filesystem is ext2/ext3/ext4/xfs.
 
diff --git a/target/linux/config/Config.in.fs b/target/linux/config/Config.in.fs
index 8bb630ee6..e148f75b2 100644
--- a/target/linux/config/Config.in.fs
+++ b/target/linux/config/Config.in.fs
@@ -8,7 +8,6 @@ config ADK_KERNEL_MISC_FILESYSTEMS
 
 config ADK_KERNEL_FSNOTIFY
 	bool
-	default y
 
 config ADK_KERNEL_EXPORTFS
 	tristate
@@ -256,7 +255,7 @@ menu "Filesystem features"
 
 config ADK_KERNEL_INOTIFY_USER
 	bool "Inotify support for userspace"
-	default y
+	default n
 	help
 	  Say Y here to enable inotify support for userspace, including the
 	  associated system calls.  Inotify allows monitoring of both files and
diff --git a/target/linux/config/Config.in.kernel b/target/linux/config/Config.in.kernel
index 3f5768fbc..1310f0fd4 100644
--- a/target/linux/config/Config.in.kernel
+++ b/target/linux/config/Config.in.kernel
@@ -204,6 +204,10 @@ config ADK_KERNEL_UEVENT_HELPER_PATH
 	default "/sbin/mdev"
 	depends on ADK_RUNTIME_DEV_MDEV
 
+config ADK_KERNEL_BINFMT_ELF
+	bool
+	default y if ADK_TARGET_BINFMT_ELF
+
 config ADK_KERNEL_BINFMT_ELF_FDPIC
 	bool
 	default y if ADK_TARGET_BINFMT_FDPIC
diff --git a/target/linux/kernel.config b/target/linux/kernel.config
index a291279c3..c32c4ce66 100644
--- a/target/linux/kernel.config
+++ b/target/linux/kernel.config
@@ -6,15 +6,12 @@ CONFIG_POSIX_MQUEUE=y
 CONFIG_POSIX_MQUEUE_SYSCTL=y
 CONFIG_PROC_FS=y
 CONFIG_PROC_SYSCTL=y
-CONFIG_FILE_LOCKING=y
 CONFIG_SYSFS=y
 CONFIG_TMPFS=y
 CONFIG_NLS=y
 CONFIG_EMBEDDED=y
 CONFIG_MODULES=y
-CONFIG_BINFMT_ELF=y
 CONFIG_BINFMT_SCRIPT=y
-CONFIG_STANDALONE=y
 CONFIG_FUTEX=y
 CONFIG_EPOLL=y
 CONFIG_SIGNALFD=y
diff --git a/target/linux/patches/4.3/regmap-default-on.patch b/target/linux/patches/4.3/regmap-default-on.patch
deleted file mode 100644
index 8d72224bf..000000000
--- a/target/linux/patches/4.3/regmap-default-on.patch
+++ /dev/null
@@ -1,17 +0,0 @@
-diff -Nur linux-4.1.6.orig/drivers/base/regmap/Kconfig linux-4.1.6/drivers/base/regmap/Kconfig
---- linux-4.1.6.orig/drivers/base/regmap/Kconfig	2015-08-17 05:52:51.000000000 +0200
-+++ linux-4.1.6/drivers/base/regmap/Kconfig	2015-08-29 22:18:50.329683337 +0200
-@@ -3,7 +3,7 @@
- # subsystems should select the appropriate symbols.
- 
- config REGMAP
--	default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ)
-+	default y
- 	select LZO_COMPRESS
- 	select LZO_DECOMPRESS
- 	select IRQ_DOMAIN if REGMAP_IRQ
-@@ -29,3 +29,4 @@
- 
- config REGMAP_IRQ
- 	bool
-+	default y