MIPS: fix endianess handling

Make endianess of target CPU configurable. Use the new config
option for dbau1550_el and pb1000 boards.

Adapt linking of standalone applications to pass through
endianess options to LD.

Build tested with:
 - ELDK 4 mips_4KC- and mips4KCle
 - Sourcery CodeBench Lite 2011.03-93

With this patch all 26 MIPS boards can be compiled now in one step by
running "MAKEALL -a mips".
Signed-off-by: NDaniel Schwierzeck <daniel.schwierzeck@googlemail.com>

README

@@ -374,6 +374,12 @@ The following options need to be configured:
 		Defines the string to utilize when trying to match PCIe device
 		tree nodes for the given platform.
 
+- Generic CPU options:
+		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
+
+		Defines the endianess of the CPU. Implementation of those
+		values is arch specific.
+
 - Intel Monahans options:
 		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
 

arch/mips/cpu/mips32/config.mk

@@ -27,14 +27,23 @@
 # Note: Toolchains with binutils prior to v2.16
 # are no longer supported by U-Boot MIPS tree!
 #
-MIPSFLAGS = -march=mips32r2
+MIPSFLAGS := -march=mips32r2
 
+# Handle special prefix in ELDK 4.0 toolchain
 ifneq (,$(findstring 4KCle,$(CROSS_COMPILE)))
-ENDIANNESS = -EL
-else
-ENDIANNESS = -EB
+ENDIANNESS := -EL
 endif
 
-MIPSFLAGS += $(ENDIANNESS)
+ifdef CONFIG_SYS_LITTLE_ENDIAN
+ENDIANNESS := -EL
+endif
+
+ifdef CONFIG_SYS_BIG_ENDIAN
+ENDIANNESS := -EB
+endif
+
+# Default to EB if no endianess is configured
+ENDIANNESS ?= -EB
 
-PLATFORM_CPPFLAGS += $(MIPSFLAGS)
+PLATFORM_CPPFLAGS += $(MIPSFLAGS) $(ENDIANNESS)
+PLATFORM_LDFLAGS += $(ENDIANNESS)

boards.cfg

@@ -360,7 +360,7 @@ dbau1000                     mips        mips32      dbau1x00            -
 dbau1100                     mips        mips32      dbau1x00            -              au1x00      dbau1x00:DBAU1100
 dbau1500                     mips        mips32      dbau1x00            -              au1x00      dbau1x00:DBAU1500
 dbau1550                     mips        mips32      dbau1x00            -              au1x00      dbau1x00:DBAU1550
-dbau1550_el                  mips        mips32      dbau1x00            -              au1x00      dbau1x00:DBAU1550
+dbau1550_el                  mips        mips32      dbau1x00            -              au1x00      dbau1x00:DBAU1550,SYS_LITTLE_ENDIAN
 gth2                         mips        mips32      -                   -              au1x00
 pb1000                       mips        mips32      pb1x00              -              au1x00      pb1x00:PB1000
 incaip                       mips        mips32      incaip              -              incaip

include/configs/pb1x00.h

@@ -46,6 +46,8 @@
 #endif
 #endif
 
+#define CONFIG_SYS_LITTLE_ENDIAN
+
 #define CONFIG_ETHADDR		DE:AD:BE:EF:01:01    /* Ethernet address */
 
 #define CONFIG_BOOTDELAY	2	/* autoboot after 2 seconds	*/