diff --git a/docs/Doxyfile_chm b/docs/Doxyfile_chm
index ae7595bc4..8688f79c9 100644
--- a/docs/Doxyfile_chm
+++ b/docs/Doxyfile_chm
@@ -31,7 +31,7 @@ PROJECT_NAME           = ChibiOS/RT
 # This could be handy for archiving the generated documentation or
 # if some version control system is used.
 
-PROJECT_NUMBER         = 2.5.0
+PROJECT_NUMBER         = 2.5.1
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer
diff --git a/docs/Doxyfile_html b/docs/Doxyfile_html
index a6f4a0939..f96084966 100644
--- a/docs/Doxyfile_html
+++ b/docs/Doxyfile_html
@@ -31,7 +31,7 @@ PROJECT_NAME           = ChibiOS/RT
 # This could be handy for archiving the generated documentation or
 # if some version control system is used.
 
-PROJECT_NUMBER         = 2.5.0
+PROJECT_NUMBER         = 2.5.1
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer
diff --git a/os/kernel/include/ch.h b/os/kernel/include/ch.h
index 073ab2280..031d27e62 100644
--- a/os/kernel/include/ch.h
+++ b/os/kernel/include/ch.h
@@ -40,7 +40,7 @@
 /**
  * @brief   Kernel version string.
  */
-#define CH_KERNEL_VERSION       "2.5.0"
+#define CH_KERNEL_VERSION       "2.5.1unstable"
 
 /**
  * @name    Kernel version
@@ -59,7 +59,7 @@
 /**
  * @brief   Kernel version patch number.
  */
-#define CH_KERNEL_PATCH         0
+#define CH_KERNEL_PATCH         1
 /** @} */
 
 /**
diff --git a/os/ports/GCC/PPC/rules.mk b/os/ports/GCC/PPC/rules.mk
index eeb5ee77b..6b49e736a 100644
--- a/os/ports/GCC/PPC/rules.mk
+++ b/os/ports/GCC/PPC/rules.mk
@@ -1,4 +1,14 @@
-# PPC e200Z makefile scripts and rules.
+# PPC makefile scripts and rules.
+
+# Output directory and files
+ifeq ($(BUILDDIR),)
+  BUILDDIR = build
+endif
+ifeq ($(BUILDDIR),.)
+  BUILDDIR = build
+endif
+OUTFILES = $(BUILDDIR)/$(PROJECT).elf $(BUILDDIR)/$(PROJECT).hex \
+           $(BUILDDIR)/$(PROJECT).bin $(BUILDDIR)/$(PROJECT).dmp
 
 # Automatic compiler options
 OPT = $(USE_OPT)
@@ -15,14 +25,20 @@ ifeq ($(USE_VLE),yes)
   MCU += -mvle
 endif
 
-# Source files groups
-SRC	     = $(CSRC)$(CPPSRC)
+# Source files groups and paths
+SRC	      = $(CSRC)$(CPPSRC)
+SRCPATHS  = $(sort $(dir $(ASMXSRC)) $(dir $(ASMSRC)) $(dir $(SRC)))
+
+# Various directories
+OBJDIR    = $(BUILDDIR)/obj
+LSTDIR    = $(BUILDDIR)/lst
 
 # Object files groups
-COBJS   = $(CSRC:.c=.o)
-CPPOBJS = $(CPPSRC:.cpp=.o)
-ASMOBJS = $(ASMSRC:.s=.o)
-OBJS	= $(ASMOBJS) $(COBJS) $(CPPOBJS)
+COBJS     = $(addprefix $(OBJDIR)/, $(notdir $(CSRC:.c=.o)))
+CPPOBJS   = $(addprefix $(OBJDIR)/, $(notdir $(CPPSRC:.cpp=.o)))
+ASMOBJS   = $(addprefix $(OBJDIR)/, $(notdir $(ASMSRC:.s=.o)))
+ASMXOBJS  = $(addprefix $(OBJDIR)/, $(notdir $(ASMXSRC:.S=.o)))
+OBJS	  = $(ASMXOBJS) $(ASMOBJS) $(COBJS) $(CPPOBJS)
 
 # Paths
 IINCDIR = $(patsubst %,-I%,$(INCDIR) $(DINCDIR) $(UINCDIR))
@@ -35,56 +51,119 @@ ADEFS   = $(DADEFS) $(UADEFS)
 # Libs
 LIBS    = $(DLIBS) $(ULIBS)
 
-MCFLAGS = -mcpu=$(MCU)
-ODFLAGS	= -x --syms
-ASFLAGS = $(MCFLAGS) -Wa,-amhls=$(<:.s=.lst) $(ADEFS)
-CPFLAGS = $(MCFLAGS) $(OPT) $(COPT) $(CWARN) -Wa,-alms=$(<:.c=.lst) $(DEFS)
-ifeq ($(LINK_GC),yes)
-  LDFLAGS = $(MCFLAGS) -nostartfiles -T$(LDSCRIPT) -Wl,-Map=$(PROJECT).map,--cref,--no-warn-mismatch,--gc-sections $(LLIBDIR)
+# Various settings
+MCFLAGS   = -mcpu=$(MCU)
+ODFLAGS	  = -x --syms
+ASFLAGS   = $(MCFLAGS) -Wa,-amhls=$(LSTDIR)/$(notdir $(<:.s=.lst)) $(ADEFS)
+ASXFLAGS  = $(MCFLAGS) -Wa,-amhls=$(LSTDIR)/$(notdir $(<:.S=.lst)) $(ADEFS)
+CFLAGS    = $(MCFLAGS) $(OPT) $(COPT) $(CWARN) -Wa,-alms=$(LSTDIR)/$(notdir $(<:.c=.lst)) $(DEFS)
+CPPFLAGS  = $(MCFLAGS) $(OPT) $(CPPOPT) $(CPPWARN) -Wa,-alms=$(LSTDIR)/$(notdir $(<:.cpp=.lst)) $(DEFS)
+ifeq ($(USE_LINK_GC),yes)
+  LDFLAGS = $(MCFLAGS) -nostartfiles -T$(LDSCRIPT) -Wl,-Map=$(BUILDDIR)/$(PROJECT).map,--cref,--no-warn-mismatch,--gc-sections $(LLIBDIR)
 else
-  LDFLAGS = $(MCFLAGS) -nostartfiles -T$(LDSCRIPT) -Wl,-Map=$(PROJECT).map,--cref,--no-warn-mismatch $(LLIBDIR)
+  LDFLAGS = $(MCFLAGS) -nostartfiles -T$(LDSCRIPT) -Wl,-Map=$(BUILDDIR)/$(PROJECT).map,--cref,--no-warn-mismatch $(LLIBDIR)
 endif
 
 # Generate dependency information
-CPFLAGS += -MD -MP -MF .dep/$(@F).d
+CFLAGS   += -MD -MP -MF .dep/$(@F).d
+CPPFLAGS += -MD -MP -MF .dep/$(@F).d
+
+# Paths where to search for sources
+VPATH     = $(SRCPATHS)
 
 #
 # Makefile rules
 #
-all: $(OBJS) $(PROJECT).elf $(PROJECT).hex $(PROJECT).bin $(PROJECT).dmp MAKE_ALL_RULE_HOOK
+
+all: $(OBJS) $(OUTFILES) MAKE_ALL_RULE_HOOK
 
 MAKE_ALL_RULE_HOOK:
 
-$(CPPOBJS) : %.o : %.cpp
-	@echo
-	$(CPPC) -c $(CPPFLAGS) -I . $(IINCDIR) $< -o $@
+$(OBJS): | $(BUILDDIR)
 
-$(COBJS) : %.o : %.c
+$(BUILDDIR) $(OBJDIR) $(LSTDIR):
+ifneq ($(USE_VERBOSE_COMPILE),yes)
+	@echo Compiler Options
+	@echo $(CC) -c $(CFLAGS) -I. $(IINCDIR) main.c -o main.o
 	@echo
-	$(CC) -c $(CPFLAGS) -I . $(IINCDIR) $< -o $@
+endif
+	mkdir -p $(OBJDIR)
+	mkdir -p $(LSTDIR)
 
-$(ASMOBJS) : %.o : %.s
+$(CPPOBJS) : $(OBJDIR)/%.o : %.cpp Makefile
+ifeq ($(USE_VERBOSE_COMPILE),yes)
 	@echo
-	$(AS) -c $(ASFLAGS) -I . $(IINCDIR) $< -o $@
+	$(CPPC) -c $(CPPFLAGS) -I. $(IINCDIR) $< -o $@
+else
+	@echo Compiling $<
+	@$(CPPC) -c $(CPPFLAGS) -I. $(IINCDIR) $< -o $@
+endif
 
-%elf: $(OBJS)
+$(COBJS) : $(OBJDIR)/%.o : %.c Makefile
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	$(CC) -c $(CFLAGS) -I. $(IINCDIR) $< -o $@
+else
+	@echo Compiling $<
+	@$(CC) -c $(CFLAGS) -I. $(IINCDIR) $< -o $@
+endif
+
+$(ASMOBJS) : $(OBJDIR)/%.o : %.s Makefile
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo
+	$(AS) -c $(ASFLAGS) -I. $(IINCDIR) $< -o $@
+else
+	@echo Compiling $<
+	@$(AS) -c $(ASFLAGS) -I. $(IINCDIR) $< -o $@
+endif
+
+$(ASMXOBJS) : $(OBJDIR)/%.o : %.S Makefile
+ifeq ($(USE_VERBOSE_COMPILE),yes)
+	@echo 
+	$(CC) -c $(ASXFLAGS) -I. $(IINCDIR) $< -o $@
+else
+	@echo Compiling $<
+	@$(CC) -c $(ASXFLAGS) -I. $(IINCDIR) $< -o $@
+endif
+
+%.elf: $(OBJS) $(LDSCRIPT)
+ifeq ($(USE_VERBOSE_COMPILE),yes)
 	@echo
 	$(LD) $(OBJS) $(LDFLAGS) $(LIBS) -o $@
+else
+	@echo Linking $@
+	@$(LD) $(OBJS) $(LDFLAGS) $(LIBS) -o $@
+endif
 
-%hex: %elf
+%.hex: %.elf $(LDSCRIPT)
+ifeq ($(USE_VERBOSE_COMPILE),yes)
 	$(HEX) $< $@
+else
+	@echo Creating $@
+	@$(HEX) $< $@
+endif
 
-%bin: %elf
+%.bin: %.elf $(LDSCRIPT)
+ifeq ($(USE_VERBOSE_COMPILE),yes)
 	$(BIN) $< $@
+else
+	@echo Creating $@
+	@$(BIN) $< $@
+endif
 
-%dmp: %elf
+%.dmp: %.elf $(LDSCRIPT)
+ifeq ($(USE_VERBOSE_COMPILE),yes)
 	$(OD) $(ODFLAGS) $< > $@
+else
+	@echo Creating $@
+	@$(OD) $(ODFLAGS) $< > $@
+	@echo Done
+endif
 
 clean:
-	-rm -f $(OBJS)
-	-rm -f $(CSRC:.c=.lst) $(CPPSRC:.cpp=.lst) $(ASMSRC:.s=.lst)
-	-rm -f $(PROJECT).elf $(PROJECT).dmp $(PROJECT).map $(PROJECT).hex $(PROJECT).bin
-	-rm -fR .dep
+	@echo Cleaning
+	-rm -fR .dep $(BUILDDIR)
+	@echo Done
 
 #
 # Include the dependency files, should be the last of the makefile
diff --git a/readme.txt b/readme.txt
index b1f52494d..06b442173 100644
--- a/readme.txt
+++ b/readme.txt
@@ -81,6 +81,11 @@
 *** Releases                                                              ***
 *****************************************************************************
 
+*** 2.5.1 ***
+- NEW: Added VLE support to the Power Architecture GCC port.
+- NEW: Updated the Power Architecture rules.mk file to put object and listing
+  files into a ./build directory like ARM ports alread do.
+
 *** 2.5.0 ***
 - FIX: Fixed anomaly in USB enumeration (bug 3565325)(backported to 2.4.3).
 - FIX: Fixed problem with lwIP statistics (bug 3564134)(backported to 2.4.3).