diff -rupN dosbox-pure.orig/Makefile dosbox-pure/Makefile
--- dosbox-pure.orig/Makefile	2022-06-06 07:58:30.237591952 -0400
+++ dosbox-pure/Makefile	2022-06-06 08:06:46.287688490 -0400
@@ -222,6 +222,23 @@ LDLIBS  := -lpthread
 LDFLAGS += $(CPUFLAGS) -shared
 #LDFLAGS += -static-libstdc++ -static-libgcc #adds 1MB to output and still dynamically links against libc and libm
 
+ifneq (,$(findstring RK3566,$(platform)))
+OUTNAME := dosbox_pure_libretro.so
+BUILD    := RELEASE
+BUILDDIR := release
+CFLAGS   := -DNDEBUG -O3 -fno-ident
+LDFLAGS  += -O3 -fno-ident
+
+CPUFLAGS := -mtune=cortex-a55 -mcpu=cortex-a55 -march=armv8-a+crc+fp+simd
+   
+CFLAGS  += $(CPUFLAGS) -fpic -fomit-frame-pointer -fno-exceptions -fno-non-call-exceptions -Wno-psabi -Wno-format
+LDFLAGS += $(CPUFLAGS) -lpthread -Wl,--gc-sections -shared
+CXX = $(CC)
+endif
+
+CFLAGS  += -pthread -D__LIBRETRO__ -Iinclude
+$(info Building $(platform) with $(CPUFLAGS))
+
 .PHONY: all clean
 all: $(OUTNAME)
 
@@ -245,9 +262,6 @@ ifeq ($(STATIC_LINKING), 1)
 else
 	$(info Linking $@ ...)
 	$(CXX) $(LDFLAGS) -o $@ $^ $(LDLIBS)
-ifneq ($(BUILD),DEBUG)
-	$(STRIPCMD) $@
-endif
 endif
 
 define COMPILE
diff -rupN dosbox-pure.orig/Makefile.orig dosbox-pure/Makefile.orig
--- dosbox-pure.orig/Makefile.orig	1969-12-31 19:00:00.000000000 -0500
+++ dosbox-pure/Makefile.orig	2022-06-06 07:58:28.449608914 -0400
@@ -0,0 +1,256 @@
+#
+#  Copyright (C) 2020-2022 Bernhard Schelling
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License along
+#  with this program; if not, write to the Free Software Foundation, Inc.,
+#  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+
+ifeq ($(ISWIN),)
+ISWIN      := $(findstring :,$(firstword $(subst \, ,$(subst /, ,$(abspath .)))))
+endif
+
+ifeq ($(ISMAC),)
+ISMAC      := $(wildcard /Applications)
+endif
+
+PIPETONULL := $(if $(ISWIN),>nul 2>nul,>/dev/null 2>/dev/null)
+
+SOURCES := \
+  *.cpp       \
+  src/*.cpp   \
+  src/*/*.cpp \
+  src/*/*/*.cpp
+
+CPUFLAGS := $(MAKE_CPUFLAGS)
+STRIPCMD := strip --strip-all
+ifneq ($(ISWIN),)
+  OUTNAME := dosbox_pure_libretro.dll
+  CXX     ?= g++
+  LDFLAGS := -Wl,--gc-sections -fno-ident
+  COMMONFLAGS += -pthread
+else ifneq (,$(findstring ios,$(platform)))
+  ifeq ($(IOSSDK),)
+    IOSSDK := $(shell xcodebuild -version -sdk iphoneos Path)
+  endif
+  OUTNAME := dosbox_pure_libretro_ios.dylib
+  MINVERSION :=
+  COMMONFLAGS += -DDISABLE_DYNAREC=1
+  ifeq ($(platform),ios-arm64)
+    CXX     = c++ -arch arm64 -isysroot $(IOSSDK)
+  else
+    CXX     = c++ -arch armv7 -isysroot $(IOSSDK)
+  endif
+  LDFLAGS := -Wl,-dead_strip
+  ifeq ($(platform),$(filter $(platform),ios9 ios-arm64))
+    MINVERSION = -miphoneos-version-min=8.0
+  else
+    MINVERSION = -miphoneos-version-min=5.0
+  endif
+  COMMONFLAGS += $(MINVERSION) -Wno-ignored-optimization-argument -Wno-unknown-warning-option
+  STRIPCMD := strip -xS
+else ifeq ($(platform),tvos-arm64)
+  ifeq ($(IOSSDK),)
+    IOSSDK := $(shell xcodebuild -version -sdk appletvos Path)
+  endif
+  OUTNAME := dosbox_pure_libretro_tvos.dylib
+  CXX     = c++ -arch arm64 -isysroot $(IOSSDK)
+  LDFLAGS := -Wl,-dead_strip
+  COMMONFLAGS += -DDISABLE_DYNAREC=1 -Wno-unknown-warning-option
+  STRIPCMD := strip -xS
+else ifneq ($(ISMAC),)
+  OUTNAME := dosbox_pure_libretro.dylib
+  CXX     ?= c++
+  LDFLAGS := -Wl,-dead_strip
+  COMMONFLAGS += -pthread -Wno-unknown-warning-option
+  ifeq ($(CROSS_COMPILE),1)
+    COMMONFLAGS  += -DDISABLE_DYNAREC=1
+    TARGET_RULE   = -target $(LIBRETRO_APPLE_PLATFORM) -isysroot $(LIBRETRO_APPLE_ISYSROOT)
+    COMMONFLAGS   += $(TARGET_RULE)
+    LDFLAGS       += $(TARGET_RULE)
+  endif
+  COMMONFLAGS  += $(ARCHFLAGS)
+  LDFLAGS      += $(ARCHFLAGS)
+  STRIPCMD := strip -xS
+else ifeq ($(platform),windows) # For MSYS2 only
+  OUTNAME := dosbox_pure_libretro.dll
+  CXX     ?= g++
+  LDFLAGS := -Wl,--gc-sections -fno-ident
+else ifeq ($(platform),vita)
+  OUTNAME := dosbox_pure_libretro_vita.a
+  CXX     := arm-vita-eabi-g++
+  AR      := arm-vita-eabi-ar
+  COMMONFLAGS += -DVITA
+  COMMONFLAGS += -mthumb -mcpu=cortex-a9 -mfloat-abi=hard -ftree-vectorize -ffast-math -fsingle-precision-constant -funroll-loops
+  COMMONFLAGS += -mword-relocations
+  COMMONFLAGS += -fno-optimize-sibling-calls
+  STATIC_LINKING = 1
+else ifeq ($(platform),ctr)
+  OUTNAME := dosbox_pure_libretro_ctr.a
+  CXX     := $(DEVKITARM)/bin/arm-none-eabi-g++
+  AR      := $(DEVKITARM)/bin/arm-none-eabi-ar
+  COMMONFLAGS += -DARM11 -D_3DS -Os -s -I$(CTRULIB)/include/ -DHAVE_MKDIR
+  COMMONFLAGS += -march=armv6k -mtune=mpcore -mfloat-abi=hard -mword-relocations
+  COMMONFLAGS += -fomit-frame-pointer -fstrict-aliasing -ffast-math -fpermissive
+  COMMONFLAGS += -I$(DEVKITPRO)/libctru/include
+  STATIC_LINKING = 1
+else ifeq ($(platform),ngc)
+  OUTNAME := dosbox_pure_libretro_ngc.a
+  CXX     := $(DEVKITPPC)/bin/powerpc-eabi-g++
+  AR      := $(DEVKITPPC)/bin/powerpc-eabi-ar
+  COMMONFLAGS += -DGEKKO -DHW_DOL -mrvl -mcpu=750 -meabi -mhard-float -D__POWERPC__ -D__ppc__ -DMSB_FIRST -DWORDS_BIGENDIAN=1
+  STATIC_LINKING = 1
+else ifeq ($(platform),wii)
+  OUTNAME := dosbox_pure_libretro_wii.a
+  CXX     := $(DEVKITPPC)/bin/powerpc-eabi-g++
+  AR      := $(DEVKITPPC)/bin/powerpc-eabi-ar
+  COMMONFLAGS += -DGEKKO -mrvl -mcpu=750 -meabi -mhard-float -fpermissive
+  COMMONFLAGS += -U__INT32_TYPE__ -U__UINT32_TYPE__ -D__INT32_TYPE__=int -D__POWERPC__ -D__ppc__ -DMSB_FIRST -DWORDS_BIGENDIAN=1
+  STATIC_LINKING = 1
+else ifeq ($(platform),wiiu)
+  OUTNAME := dosbox_pure_libretro_wiiu.a
+  CXX     := $(DEVKITPPC)/bin/powerpc-eabi-g++
+  AR      := $(DEVKITPPC)/bin/powerpc-eabi-ar
+  COMMONFLAGS += -DGEKKO -DWIIU -DHW_RVL -mcpu=750 -meabi -mhard-float
+  COMMONFLAGS += -U__INT32_TYPE__ -U__UINT32_TYPE__ -D__INT32_TYPE__=int -D__POWERPC__ -D__ppc__ -DMSB_FIRST -DWORDS_BIGENDIAN=1 -DGX_PTHREAD_LEGACY
+  STATIC_LINKING = 1
+else ifeq ($(platform),libnx)
+  OUTNAME := dosbox_pure_libretro_libnx.a
+  export DEPSDIR = $(CURDIR)
+  include $(DEVKITPRO)/libnx/switch_rules
+  COMMONFLAGS += -I$(LIBNX)/include/ -ftls-model=local-exec -specs=$(LIBNX)/switch.specs
+  COMMONFLAGS += $(INCLUDE) -D__SWITCH__ -DHAVE_LIBNX
+  STATIC_LINKING = 1
+else ifeq ($(platform),gcw0)
+  # You must used the toolchain built on or around 2014-08-20
+  OUTNAME := dosbox_pure_libretro.so
+  CXX     := /opt/gcw0-toolchain/usr/bin/mipsel-linux-g++
+  LDFLAGS := -Wl,--gc-sections -fno-ident
+  CPUFLAGS := -ffast-math -march=mips32r2 -mtune=mips32r2 -mhard-float -fexpensive-optimizations -frename-registers
+  COMMONFLAGS += -pthread
+  STRIPCMD := /opt/gcw0-toolchain/usr/mipsel-gcw0-linux-uclibc/bin/strip --strip-all
+else ifneq ($(findstring Haiku,$(shell uname -s)),)
+  OUTNAME := dosbox_pure_libretro.so
+  LDFLAGS := -Wl,--gc-sections -fno-ident -lroot -lnetwork
+  ifneq ($(findstring BePC,$(shell uname -m)),)
+    CXX   ?= g++-x86
+  else
+    CXX   ?= g++
+  endif
+else
+  OUTNAME := dosbox_pure_libretro.so
+  CXX     ?= g++
+  LDFLAGS := -Wl,--gc-sections -fno-ident
+  COMMONFLAGS += -pthread
+  ifeq ($(CPUFLAGS),)
+    # ARM optimizations
+    PROCCPU := $(shell cat /proc/cpuinfo))
+    ifneq ($(and $(filter ARMv7,$(PROCCPU)),$(filter neon,$(PROCCPU))),)
+      CPUFLAGS := -marm -mcpu=cortex-a72 -mfpu=neon-fp-armv8 -mfloat-abi=hard -ffast-math
+    else ifeq ($(ARM_RPI4), 1)
+      CPUFLAGS := -marm -mcpu=cortex-a72 -mfpu=neon-fp-armv8 -mfloat-abi=hard -ffast-math
+    else
+      ifeq ($(CORTEX_A7), 1)
+        CPUFLAGS += -marm -mcpu=cortex-a7
+        ifeq ($(ARM_NEON), 1)
+          CPUFLAGS += -mfpu=neon-vfpv4
+        endif
+      endif
+      ifeq ($(ARM_HARDFLOAT), 1)
+        CPUFLAGS += -mfloat-abi=hard
+      endif
+    endif
+  endif
+  CXX_VER := $(shell $(CXX) -v 2>&1)
+  ifneq ($(and $(findstring arm,$(CXX_VER)),$(findstring version 10,$(CXX_VER))),)
+    # Switch to gcc 9 to avoid buggy assembly genetation of gcc 10
+    # On armv7l, gcc 10.2 with -O2 on the file core_dynrec.cpp generates assembly that wrongfully passes NULL to the runcode function
+    # resulting in a segfault crash. It can be observed by writing block->cache.start to stdout twice where it is NULL at first
+    # and then the actual value thereafter. This affects upstream SVN DOSBox as well as this core.
+    CXX := g++-9
+  endif
+endif
+
+ifeq ($(BUILD),DEBUG)
+  BUILDDIR := debug
+  CFLAGS   := -DDEBUG -D_DEBUG -g -O0
+else ifeq ($(BUILD),PROFILE)
+  BUILDDIR := profile
+  CFLAGS   := -DNDEBUG -O2
+else ifeq ($(BUILD),RELEASEDBG)
+  BUILDDIR := releasedbg
+  CFLAGS   := -DNDEBUG -ggdb -O2
+  LDFLAGS  += -ggdb -O2
+else ifeq ($(BUILD),ASAN)
+  BUILDDIR := asan
+  CFLAGS   := -DDEBUG -D_DEBUG -g -O0 -fsanitize=address -fno-omit-frame-pointer
+  LDFLAGS  += -fsanitize=address -g -O0
+else
+  BUILD    := RELEASE
+  BUILDDIR := release
+  ifeq ($(platform),vita)
+    CFLAGS   := -DNDEBUG -O3 -fno-ident -fno-partial-inlining
+  else
+    CFLAGS   := -DNDEBUG -O2 -fno-ident
+  endif
+  LDFLAGS  += -O2
+endif
+
+CFLAGS  += $(CPUFLAGS) -std=gnu++11 -fomit-frame-pointer -fno-exceptions -fno-non-call-exceptions -Wno-address-of-packed-member -Wno-format -Wno-switch -Wno-psabi
+ifneq ($(STATIC_LINKING), 1)
+  CFLAGS  += -fpic
+else
+  CFLAGS  += -DSTATIC_LINKING
+endif
+
+CFLAGS  += -fvisibility=hidden -ffunction-sections
+CFLAGS  += -D__LIBRETRO__ -Iinclude -D_FILE_OFFSET_BITS=64
+CFLAGS  += $(COMMONFLAGS)
+#CFLAGS  += -fdata-sections #saves around 32 bytes on most platforms but wrongfully adds up to 60MB on msys2
+
+LDLIBS  := -lpthread
+LDFLAGS += $(CPUFLAGS) -shared
+#LDFLAGS += -static-libstdc++ -static-libgcc #adds 1MB to output and still dynamically links against libc and libm
+
+.PHONY: all clean
+all: $(OUTNAME)
+
+$(info Building $(OUTNAME) with $(BUILD) configuration (obj files stored in build/$(BUILDDIR)) ...)
+SOURCES := $(wildcard $(SOURCES))
+$(if $(findstring ~,$(SOURCES)),$(error SOURCES contains a filename with a ~ character in it - Unable to continue))
+$(if $(wildcard build),,$(shell mkdir "build"))
+$(if $(wildcard build/$(BUILDDIR)),,$(shell mkdir "build/$(BUILDDIR)"))
+OBJS := $(addprefix build/$(BUILDDIR)/,$(subst /,~,$(patsubst %,%.o,$(SOURCES))))
+-include $(OBJS:%.o=%.d)
+$(foreach F,$(OBJS),$(eval $(F): $(subst ~,/,$(patsubst build/$(BUILDDIR)/%.o,%,$(F))) ; $$(call COMPILE,$$@,$$<)))
+
+clean:
+	$(info Removing all build files ...)
+	@$(if $(wildcard build/$(BUILDDIR)),$(if $(ISWIN),rmdir /S /Q,rm -rf) "build/$(BUILDDIR)" $(PIPETONULL))
+
+$(OUTNAME) : $(OBJS)
+ifeq ($(STATIC_LINKING), 1)
+	$(info Static linking $@ ...)
+	$(AR) rcs $@ $^
+else
+	$(info Linking $@ ...)
+	$(CXX) $(LDFLAGS) -o $@ $^ $(LDLIBS)
+ifneq ($(BUILD),DEBUG)
+	$(STRIPCMD) $@
+endif
+endif
+
+define COMPILE
+	$(info Compiling $2 ...)
+	@$(CXX) $(CFLAGS) -MMD -MP -o $1 -c $2
+endef