Split target/Config.in.arch into multiple Config.in.* in arch/

target/Config.in.arch had become too long, and we want to remove the
target/ directory. So let's move it to arch/ and split it this way:

 * An initial Config.in that lists the top-level architecture, and
   sources the arch-specific Config.in.<arch> files, as well as
   Config.in.common (see below)

 * One Config.in.<arch> per architecture, listing the CPU families,
   ABI choices, etc.

 * One Config.in.common that defines the gcc mtune, march, mcpu values
   and other hidden options.

[Peter: space->tab fix, mipsel64 little endian, mips3 as noted by Arnout]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

arch/Config.in

@@ -0,0 +1,161 @@
+config BR2_ARCH_IS_64
+       bool
+
+choice
+	prompt "Target Architecture"
+	default BR2_i386
+	help
+	  Select the target architecture family to build for.
+
+config BR2_arm
+	bool "ARM (little endian)"
+	help
+	  ARM is a 32-bit reduced instruction set computer (RISC) instruction
+	  set architecture (ISA) developed by ARM Holdings. Little endian.
+	  http://www.arm.com/
+	  http://en.wikipedia.org/wiki/ARM
+
+config BR2_armeb
+	bool "ARM (big endian)"
+	help
+	  ARM is a 32-bit reduced instruction set computer (RISC) instruction
+	  set architecture (ISA) developed by ARM Holdings. Big endian.
+	  http://www.arm.com/
+	  http://en.wikipedia.org/wiki/ARM
+
+config BR2_aarch64
+	bool "AArch64"
+	help
+	  Aarch64 is a 64-bit architecture developed by ARM Holdings.
+	  http://www.arm.com/products/processors/instruction-set-architectures/armv8-architecture.php
+	  http://en.wikipedia.org/wiki/ARM
+
+config BR2_avr32
+	bool "AVR32"
+	select BR2_SOFT_FLOAT
+	help
+	  The AVR32 is a 32-bit RISC microprocessor architecture designed by
+	  Atmel.
+	  http://www.atmel.com/
+	  http://en.wikipedia.org/wiki/Avr32
+
+config BR2_bfin
+	bool "Blackfin"
+	help
+	  The Blackfin is a family of 16 or 32-bit microprocessors developed,
+	  manufactured and marketed by Analog Devices.
+	  http://www.analog.com/
+	  http://en.wikipedia.org/wiki/Blackfin
+
+config BR2_i386
+	bool "i386"
+	help
+	  Intel i386 architecture compatible microprocessor
+	  http://en.wikipedia.org/wiki/I386
+
+config BR2_m68k
+	bool "m68k"
+	depends on BROKEN # ice in uclibc / inet_ntoa_r
+	help
+	  Motorola 68000 family microprocessor
+	  http://en.wikipedia.org/wiki/M68k
+
+config BR2_microblazeel
+	bool "Microblaze AXI (little endian)"
+	help
+	  Soft processor core designed for Xilinx FPGAs from Xilinx. AXI bus
+	  based architecture (little endian)
+	  http://www.xilinx.com
+	  http://en.wikipedia.org/wiki/Microblaze
+
+config BR2_microblazebe
+	bool "Microblaze non-AXI (big endian)"
+	help
+	  Soft processor core designed for Xilinx FPGAs from Xilinx. PLB bus
+	  based architecture (non-AXI, big endian)
+	  http://www.xilinx.com
+	  http://en.wikipedia.org/wiki/Microblaze
+
+config BR2_mips
+	bool "MIPS (big endian)"
+	help
+	  MIPS is a RISC microprocessor from MIPS Technologies. Big endian.
+	  http://www.mips.com/
+	  http://en.wikipedia.org/wiki/MIPS_Technologies
+
+config BR2_mipsel
+	bool "MIPS (little endian)"
+	help
+	  MIPS is a RISC microprocessor from MIPS Technologies. Little endian.
+	  http://www.mips.com/
+	  http://en.wikipedia.org/wiki/MIPS_Technologies
+
+config BR2_mips64
+	bool "MIPS64 (big endian)"
+	select BR2_ARCH_IS_64
+	help
+	  MIPS is a RISC microprocessor from MIPS Technologies. Big endian.
+	  http://www.mips.com/
+	  http://en.wikipedia.org/wiki/MIPS_Technologies
+
+config BR2_mips64el
+	bool "MIPS64 (little endian)"
+	select BR2_ARCH_IS_64
+	help
+	  MIPS is a RISC microprocessor from MIPS Technologies. Little endian.
+	  http://www.mips.com/
+	  http://en.wikipedia.org/wiki/MIPS_Technologies
+
+config BR2_powerpc
+	bool "PowerPC"
+	help
+	  PowerPC is a RISC architecture created by Apple-IBM-Motorola alliance.
+	  http://www.power.org/
+	  http://en.wikipedia.org/wiki/Powerpc
+
+config BR2_sh
+	bool "SuperH"
+	help
+	  SuperH (or SH) is a 32-bit reduced instruction set computer (RISC)
+	  instruction set architecture (ISA) developed by Hitachi.
+	  http://www.hitachi.com/
+	  http://en.wikipedia.org/wiki/SuperH
+
+config BR2_sh64
+	bool "SuperH64"
+	help
+	  SuperH64 (or SH) is a 64-bit reduced instruction set computer (RISC)
+	  instruction set architecture (ISA) developed by Hitachi.
+	  http://www.hitachi.com/
+	  http://en.wikipedia.org/wiki/SuperH
+
+config BR2_sparc
+	bool "SPARC"
+	help
+	  SPARC (from Scalable Processor Architecture) is a RISC instruction
+	  set architecture (ISA) developed by Sun Microsystems.
+	  http://www.oracle.com/sun
+	  http://en.wikipedia.org/wiki/Sparc
+
+config BR2_x86_64
+	bool "x86_64"
+	select BR2_ARCH_IS_64
+	help
+	  x86-64 is an extension of the x86 instruction set (Intel i386
+	  architecture compatible microprocessor).
+	  http://en.wikipedia.org/wiki/X86_64
+
+endchoice
+
+config BR2_microblaze
+	bool
+	default y if BR2_microblazeel || BR2_microblazebe
+
+source "arch/Config.in.arm"
+source "arch/Config.in.bfin"
+source "arch/Config.in.mips"
+source "arch/Config.in.powerpc"
+source "arch/Config.in.sh"
+source "arch/Config.in.sparc"
+source "arch/Config.in.x86"
+source "arch/Config.in.common"