diff --git a/cmake/toolchain/zephyr/0.11/Kconfig b/cmake/toolchain/zephyr/0.11/Kconfig
deleted file mode 100644
index f8a37312de4..00000000000
--- a/cmake/toolchain/zephyr/0.11/Kconfig
+++ /dev/null
@@ -1,8 +0,0 @@
-# Zephyr 0.11 SDK Toolchain
-
-# Copyright (c) 2020 Linaro Limited.
-# SPDX-License-Identifier: Apache-2.0
-
-config TOOLCHAIN_ZEPHYR_0_11
-	def_bool y
-	select HAS_NEWLIB_LIBC_NANO if (ARC || ARM || RISCV)
diff --git a/cmake/toolchain/zephyr/0.11/generic.cmake b/cmake/toolchain/zephyr/0.11/generic.cmake
deleted file mode 100644
index 0224d5ad9c0..00000000000
--- a/cmake/toolchain/zephyr/0.11/generic.cmake
+++ /dev/null
@@ -1,34 +0,0 @@
-# SPDX-License-Identifier: Apache-2.0
-
-set(TOOLCHAIN_HOME ${ZEPHYR_SDK_INSTALL_DIR})
-
-set(COMPILER gcc)
-set(LINKER ld)
-set(BINTOOLS gnu)
-
-# Find some toolchain that is distributed with this particular SDK
-
-file(GLOB toolchain_paths
-  LIST_DIRECTORIES true
-  ${TOOLCHAIN_HOME}/xtensa/*/*-zephyr-elf
-  ${TOOLCHAIN_HOME}/*-zephyr-elf
-  ${TOOLCHAIN_HOME}/*-zephyr-eabi
-  )
-
-if(toolchain_paths)
-  list(GET toolchain_paths 0 some_toolchain_path)
-
-  get_filename_component(one_toolchain_root "${some_toolchain_path}" DIRECTORY)
-  get_filename_component(one_toolchain "${some_toolchain_path}" NAME)
-
-  set(CROSS_COMPILE_TARGET ${one_toolchain})
-  set(SYSROOT_TARGET	   ${one_toolchain})
-endif()
-
-if(NOT CROSS_COMPILE_TARGET)
-  message(FATAL_ERROR "Unable to find 'x86_64-zephyr-elf' or any other architecture in ${TOOLCHAIN_HOME}")
-endif()
-
-set(CROSS_COMPILE ${one_toolchain_root}/${CROSS_COMPILE_TARGET}/bin/${CROSS_COMPILE_TARGET}-)
-set(SYSROOT_DIR   ${one_toolchain_root}/${SYSROOT_TARGET}/${SYSROOT_TARGET})
-set(TOOLCHAIN_HAS_NEWLIB ON CACHE BOOL "True if toolchain supports newlib")
diff --git a/cmake/toolchain/zephyr/0.11/host-tools.cmake b/cmake/toolchain/zephyr/0.11/host-tools.cmake
deleted file mode 100644
index 604c8ade4ca..00000000000
--- a/cmake/toolchain/zephyr/0.11/host-tools.cmake
+++ /dev/null
@@ -1,12 +0,0 @@
-# SPDX-License-Identifier: Apache-2.0
-
-set(HOST_TOOLS_HOME ${ZEPHYR_SDK_INSTALL_DIR}/sysroots/${TOOLCHAIN_ARCH}-pokysdk-linux)
-
-# Path used for searching by the find_*() functions, with appropriate
-# suffixes added. Ensures that the SDK's host tools will be found when
-# we call, e.g. find_program(QEMU qemu-system-x86)
-list(APPEND CMAKE_PREFIX_PATH ${HOST_TOOLS_HOME}/usr)
-
-# TODO: Use find_* somehow for these as well?
-set_ifndef(QEMU_BIOS            ${HOST_TOOLS_HOME}/usr/share/qemu)
-set_ifndef(OPENOCD_DEFAULT_PATH ${HOST_TOOLS_HOME}/usr/share/openocd/scripts)
diff --git a/cmake/toolchain/zephyr/0.11/target.cmake b/cmake/toolchain/zephyr/0.11/target.cmake
deleted file mode 100644
index 5f2d97109f4..00000000000
--- a/cmake/toolchain/zephyr/0.11/target.cmake
+++ /dev/null
@@ -1,53 +0,0 @@
-# SPDX-License-Identifier: Apache-2.0
-
-set(CROSS_COMPILE_TARGET_arm        arm-zephyr-eabi)
-set(CROSS_COMPILE_TARGET_arm64   aarch64-zephyr-elf)
-set(CROSS_COMPILE_TARGET_nios2     nios2-zephyr-elf)
-set(CROSS_COMPILE_TARGET_riscv   riscv64-zephyr-elf)
-set(CROSS_COMPILE_TARGET_mips     mipsel-zephyr-elf)
-set(CROSS_COMPILE_TARGET_xtensa   xtensa-zephyr-elf)
-set(CROSS_COMPILE_TARGET_arc         arc-zephyr-elf)
-set(CROSS_COMPILE_TARGET_x86      x86_64-zephyr-elf)
-set(CROSS_COMPILE_TARGET_sparc     sparc-zephyr-elf)
-
-set(CROSS_COMPILE_TARGET ${CROSS_COMPILE_TARGET_${ARCH}})
-set(SYSROOT_TARGET       ${CROSS_COMPILE_TARGET})
-
-if("${ARCH}" STREQUAL "xtensa")
-  # Xtensa GCC needs a different toolchain per SOC
-  if("${SOC_SERIES}" STREQUAL "cavs_v15")
-    set(SR_XT_TC_SOC intel_apl_adsp)
-  elseif("${SOC_SERIES}" STREQUAL "cavs_v18")
-    set(SR_XT_TC_SOC intel_s1000)
-  elseif("${SOC_SERIES}" STREQUAL "cavs_v20")
-    set(SR_XT_TC_SOC intel_s1000)
-  elseif("${SOC_SERIES}" STREQUAL "cavs_v25")
-    set(SR_XT_TC_SOC intel_s1000)
-  elseif("${SOC_SERIES}" STREQUAL "baytrail_adsp")
-    set(SR_XT_TC_SOC intel_byt_adsp)
-  elseif("${SOC_SERIES}" STREQUAL "broadwell_adsp")
-    set(SR_XT_TC_SOC intel_bdw_adsp)
-  elseif("${SOC_SERIES}" STREQUAL "imx8")
-    set(SR_XT_TC_SOC nxp_imx_adsp)
-  elseif("${SOC_SERIES}" STREQUAL "imx8m")
-    set(SR_XT_TC_SOC nxp_imx8m_adsp)
-  else()
-    message(FATAL_ERROR "Not compiler set for SOC_SERIES ${SOC_SERIES}")
- endif()
- set(SYSROOT_DIR ${TOOLCHAIN_HOME}/xtensa/${SR_XT_TC_SOC}/${SYSROOT_TARGET})
- set(CROSS_COMPILE ${TOOLCHAIN_HOME}/xtensa/${SR_XT_TC_SOC}/${CROSS_COMPILE_TARGET}/bin/${CROSS_COMPILE_TARGET}-)
-else()
-  # Non-Xtensa SDK toolchains follow a simpler convention
-  set(SYSROOT_DIR   ${TOOLCHAIN_HOME}/${SYSROOT_TARGET}/${SYSROOT_TARGET})
-  set(CROSS_COMPILE ${TOOLCHAIN_HOME}/${CROSS_COMPILE_TARGET}/bin/${CROSS_COMPILE_TARGET}-)
-endif()
-
-if("${ARCH}" STREQUAL "x86")
-  if(CONFIG_X86_64)
-    list(APPEND TOOLCHAIN_C_FLAGS -m64)
-    list(APPEND TOOLCHAIN_LD_FLAGS -m64)
-  else()
-    list(APPEND TOOLCHAIN_C_FLAGS -m32)
-    list(APPEND TOOLCHAIN_LD_FLAGS -m32)
-  endif()
-endif()
diff --git a/cmake/toolchain/zephyr/generic.cmake b/cmake/toolchain/zephyr/generic.cmake
index b4c25b79be5..bc98939a02f 100644
--- a/cmake/toolchain/zephyr/generic.cmake
+++ b/cmake/toolchain/zephyr/generic.cmake
@@ -1,13 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-if(${SDK_VERSION} VERSION_LESS_EQUAL 0.11.2)
-  # For backward compatibility with 0.11.1 and 0.11.2
-  # we need to source files from Zephyr repo
-  include(${CMAKE_CURRENT_LIST_DIR}/${SDK_MAJOR_MINOR}/generic.cmake)
+include(${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr/generic.cmake)
 
-  set(TOOLCHAIN_KCONFIG_DIR ${CMAKE_CURRENT_LIST_DIR}/${SDK_MAJOR_MINOR})
-else()
-  include(${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr/generic.cmake)
-
-  set(TOOLCHAIN_KCONFIG_DIR ${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr)
-endif()
+set(TOOLCHAIN_KCONFIG_DIR ${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr)
diff --git a/cmake/toolchain/zephyr/host-tools.cmake b/cmake/toolchain/zephyr/host-tools.cmake
index 2522c86bf8f..cc50b73744a 100644
--- a/cmake/toolchain/zephyr/host-tools.cmake
+++ b/cmake/toolchain/zephyr/host-tools.cmake
@@ -1,9 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-# This is the minimum required version for Zephyr to work (Old style)
-set(REQUIRED_SDK_VER 0.11.1)
-cmake_host_system_information(RESULT TOOLCHAIN_ARCH QUERY OS_PLATFORM)
-
 if(NOT DEFINED ZEPHYR_SDK_INSTALL_DIR)
   # Until https://github.com/zephyrproject-rtos/zephyr/issues/4912 is
   # resolved we use ZEPHYR_SDK_INSTALL_DIR to determine whether the user
@@ -14,42 +10,6 @@ endif()
 # Cache the Zephyr SDK install dir.
 set(ZEPHYR_SDK_INSTALL_DIR ${ZEPHYR_SDK_INSTALL_DIR} CACHE PATH "Zephyr SDK install directory")
 
-if(NOT DEFINED SDK_VERSION)
-  if(ZEPHYR_TOOLCHAIN_VARIANT AND ZEPHYR_SDK_INSTALL_DIR)
-    # Manual detection for Zephyr SDK 0.11.1 and 0.11.2 for backward compatibility.
-    set(sdk_version_path ${ZEPHYR_SDK_INSTALL_DIR}/sdk_version)
-    if(NOT (EXISTS ${sdk_version_path}))
-      message(FATAL_ERROR
-              "The file '${ZEPHYR_SDK_INSTALL_DIR}/sdk_version' was not found. \
-               Is ZEPHYR_SDK_INSTALL_DIR=${ZEPHYR_SDK_INSTALL_DIR} misconfigured?")
-    endif()
-
-    # Read version as published by the SDK
-    file(READ ${sdk_version_path} SDK_VERSION_PRE1)
-    # Remove any pre-release data, for example 0.10.0-beta4 -> 0.10.0
-    string(REGEX REPLACE "-.*" "" SDK_VERSION_PRE2 ${SDK_VERSION_PRE1})
-    # Strip any trailing spaces/newlines from the version string
-    string(STRIP ${SDK_VERSION_PRE2} SDK_VERSION)
-    string(REGEX MATCH "([0-9]*).([0-9]*)" SDK_MAJOR_MINOR ${SDK_VERSION})
-
-    string(REGEX MATCH "([0-9]+)\.([0-9]+)\.([0-9]+)" SDK_MAJOR_MINOR_MICRO ${SDK_VERSION})
-
-    #at least 0.0.0
-    if(NOT SDK_MAJOR_MINOR_MICRO)
-      message(FATAL_ERROR "sdk version: ${SDK_MAJOR_MINOR_MICRO} improper format.
-      Expected format: x.y.z
-      Check whether the Zephyr SDK was installed correctly.
-    ")
-    endif()
-  endif()
-endif()
-
 message(STATUS "Using toolchain: zephyr ${SDK_VERSION} (${ZEPHYR_SDK_INSTALL_DIR})")
 
-if(${SDK_VERSION} VERSION_LESS_EQUAL 0.11.2)
-  # For backward compatibility with 0.11.1 and 0.11.2
-  # we need to source files from Zephyr repo
-  include(${CMAKE_CURRENT_LIST_DIR}/${SDK_MAJOR_MINOR}/host-tools.cmake)
-else()
-  include(${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr/host-tools.cmake)
-endif()
+include(${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr/host-tools.cmake)
diff --git a/cmake/toolchain/zephyr/target.cmake b/cmake/toolchain/zephyr/target.cmake
index 39f5cd2c1bf..fd1ec6d55fd 100644
--- a/cmake/toolchain/zephyr/target.cmake
+++ b/cmake/toolchain/zephyr/target.cmake
@@ -1,18 +1,9 @@
 # SPDX-License-Identifier: Apache-2.0
 
-if(${SDK_VERSION} VERSION_LESS_EQUAL 0.11.2)
-  # For backward compatibility with 0.11.1 and 0.11.2
-  # we need to source files from Zephyr repo
-  include(${CMAKE_CURRENT_LIST_DIR}/${SDK_MAJOR_MINOR}/target.cmake)
-elseif(("${ARCH}" STREQUAL "sparc") AND (${SDK_VERSION} VERSION_LESS 0.12))
-  # SDK 0.11.3, 0.11.4 does not have SPARC target support.
-  include(${CMAKE_CURRENT_LIST_DIR}/${SDK_MAJOR_MINOR}/target.cmake)
-else()
-  include(${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr/target.cmake)
+include(${ZEPHYR_SDK_INSTALL_DIR}/cmake/zephyr/target.cmake)
 
-  # Workaround, FIXME: Waiting for new SDK.
-  if("${ARCH}" STREQUAL "xtensa")
-    set(SYSROOT_DIR ${TOOLCHAIN_HOME}/xtensa/${SOC_TOOLCHAIN_NAME}/${SYSROOT_TARGET})
-    set(CROSS_COMPILE ${TOOLCHAIN_HOME}/xtensa/${SOC_TOOLCHAIN_NAME}/${CROSS_COMPILE_TARGET}/bin/${CROSS_COMPILE_TARGET}-)
-  endif()
+# Workaround, FIXME: Waiting for new SDK.
+if("${ARCH}" STREQUAL "xtensa")
+  set(SYSROOT_DIR ${TOOLCHAIN_HOME}/xtensa/${SOC_TOOLCHAIN_NAME}/${SYSROOT_TARGET})
+  set(CROSS_COMPILE ${TOOLCHAIN_HOME}/xtensa/${SOC_TOOLCHAIN_NAME}/${CROSS_COMPILE_TARGET}/bin/${CROSS_COMPILE_TARGET}-)
 endif()