diff --git a/bsp/qemu-virt64-riscv/.config b/bsp/qemu-virt64-riscv/.config
index debc4ca311a..67de44eef6e 100644
--- a/bsp/qemu-virt64-riscv/.config
+++ b/bsp/qemu-virt64-riscv/.config
@@ -272,7 +272,6 @@ CONFIG_RT_DFS_ELM_MUTEX_TIMEOUT=3000
 
 CONFIG_RT_USING_DFS_DEVFS=y
 CONFIG_RT_USING_DFS_ROMFS=y
-# CONFIG_RT_USING_DFS_ROMFS_USER_ROOT is not set
 # CONFIG_RT_USING_DFS_CROMFS is not set
 # CONFIG_RT_USING_DFS_TMPFS is not set
 # CONFIG_RT_USING_DFS_MQUEUE is not set
@@ -1434,7 +1433,6 @@ CONFIG_RT_USING_ADT_REF=y
 #
 # RISC-V QEMU virt64 configs
 #
-CONFIG_RISCV_S_MODE=y
 CONFIG_BSP_USING_VIRTIO=y
 CONFIG_BSP_USING_VIRTIO_BLK=y
 CONFIG_BSP_USING_VIRTIO_NET=y
diff --git a/bsp/qemu-virt64-riscv/driver/Kconfig b/bsp/qemu-virt64-riscv/driver/Kconfig
index 590de38f4ad..ba9a2650e19 100644
--- a/bsp/qemu-virt64-riscv/driver/Kconfig
+++ b/bsp/qemu-virt64-riscv/driver/Kconfig
@@ -1,9 +1,5 @@
 menu "RISC-V QEMU virt64 configs"
 
-config RISCV_S_MODE
-    bool "RT-Thread run in RISC-V S-Mode(supervisor mode)"
-    default y
-
 config BSP_USING_VIRTIO
     bool "Using VirtIO"
     default y
diff --git a/bsp/qemu-virt64-riscv/rtconfig.h b/bsp/qemu-virt64-riscv/rtconfig.h
index d68cf44446c..221ee5eb9bc 100644
--- a/bsp/qemu-virt64-riscv/rtconfig.h
+++ b/bsp/qemu-virt64-riscv/rtconfig.h
@@ -519,7 +519,6 @@
 
 /* RISC-V QEMU virt64 configs */
 
-#define RISCV_S_MODE
 #define BSP_USING_VIRTIO
 #define BSP_USING_VIRTIO_BLK
 #define BSP_USING_VIRTIO_NET
diff --git a/libcpu/risc-v/common64/README.md b/libcpu/risc-v/common64/README.md
index 1d027216f19..5e7ea4bf92e 100644
--- a/libcpu/risc-v/common64/README.md
+++ b/libcpu/risc-v/common64/README.md
@@ -33,7 +33,7 @@
 
 | 选项            |  默认值 | 说明                                                                                                 |
 | --------------- | --- | ---------------------------------------------------------------------------------------------------- |
-| RISCV_S_MODE    | 打开 | 系统启动后是否运行在S态，关闭时系统将运行在M态；目前系统存在bug尚不可直接运行在M态，故此开关必须打开 |
+| RISCV_VIRT64_S_MODE    | 打开 | 系统启动后是否运行在S态，关闭时系统将运行在M态；目前系统存在bug尚不可直接运行在M态，故此开关必须打开 |
 | RT_USING_SMART  | 关闭 | 是否开启RTThread SMART版本，开启后系统运行在S+U态，且会开启MMU页表(satp);关闭时系统仅运行在S态，MMU关闭(satp为bare translation)    |
 | ARCH_USING_ASID | 关闭 | MMU是否支持asid                                                                     |
 
diff --git a/libcpu/risc-v/virt64/plic.c b/libcpu/risc-v/virt64/plic.c
index f222146f34d..8aab8b1292b 100644
--- a/libcpu/risc-v/virt64/plic.c
+++ b/libcpu/risc-v/virt64/plic.c
@@ -52,7 +52,7 @@ void plic_irq_enable(int irq)
 {
     int hart = __raw_hartid();
     *(uint32_t *)PLIC_ENABLE(hart) = ((*(uint32_t *)PLIC_ENABLE(hart)) | (1 << irq));
-#ifdef RISCV_S_MODE
+#ifdef RISCV_VIRT64_S_MODE
     set_csr(sie, read_csr(sie) | MIP_SEIP);
 #else
     set_csr(mie, read_csr(mie) | MIP_MEIP);
diff --git a/libcpu/risc-v/virt64/plic.h b/libcpu/risc-v/virt64/plic.h
index 314210c66b5..a13b6d96222 100644
--- a/libcpu/risc-v/virt64/plic.h
+++ b/libcpu/risc-v/virt64/plic.h
@@ -30,7 +30,10 @@ extern size_t plic_base;
 #define PLIC_ENABLE_STRIDE              0x80
 #define PLIC_CONTEXT_STRIDE             0x1000
 
-#ifndef RISCV_S_MODE
+/* RT-Thread runs in S-mode on virt64 by default */
+#define RISCV_VIRT64_S_MODE
+
+#ifndef RISCV_VIRT64_S_MODE
 #define PLIC_MENABLE_OFFSET             (0x2000)
 #define PLIC_MTHRESHOLD_OFFSET          (0x200000)
 #define PLIC_MCLAIM_OFFSET              (0x200004)
diff --git a/tools/building.py b/tools/building.py
index 5c8e3941984..c64c393ba00 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -210,15 +210,16 @@ def PrepareBuilding(env, root_directory, has_libcpu=False, remove_components = [
             envm = utils.ImportModule('env_utility')
             # from env import GetSDKPath
             exec_path = envm.GetSDKPath(rtconfig.CC)
-            if 'gcc' in rtconfig.CC:
-                exec_path = os.path.join(exec_path, 'bin')
-
-            if os.path.exists(exec_path):
-                Env['log'].debug('set CC to ' + exec_path)
-                rtconfig.EXEC_PATH = exec_path
-                os.environ['RTT_EXEC_PATH'] = exec_path
-            else:
-                Env['log'].debug('No Toolchain found in path(%s).' % exec_path)
+            if exec_path != None:
+                if 'gcc' in rtconfig.CC:
+                    exec_path = os.path.join(exec_path, 'bin')
+
+                if os.path.exists(exec_path):
+                    Env['log'].debug('set CC to ' + exec_path)
+                    rtconfig.EXEC_PATH = exec_path
+                    os.environ['RTT_EXEC_PATH'] = exec_path
+                else:
+                    Env['log'].debug('No Toolchain found in path(%s).' % exec_path)
         except Exception as e:
             # detect failed, ignore
             Env['log'].debug(e)
diff --git a/tools/env_utility.py b/tools/env_utility.py
index 608ef4fa156..d950d077334 100644
--- a/tools/env_utility.py
+++ b/tools/env_utility.py
@@ -55,6 +55,15 @@ def GetSDKPath(name):
     sdk_pkgs = GetSDKPackagePath()
 
     if sdk_pkgs:
+        # read env/tools/scripts/sdk_cfg.json for curstomized SDK path
+        if os.path.exists(os.path.join(sdk_pkgs, '..', 'sdk_cfg.json')):
+            with open(os.path.join(sdk_pkgs, '..', 'sdk_cfg.json'), 'r', encoding='utf-8') as f:
+                sdk_cfg = json.load(f)
+                for item in sdk_cfg:
+                    if item['name'] == name:
+                        sdk = os.path.join(sdk_pkgs, item['path'])
+                        return sdk
+
         # read packages.json under env/tools/scripts/packages
         with open(os.path.join(sdk_pkgs, 'pkgs.json'), 'r', encoding='utf-8') as f:
             # packages_json = f.read()
@@ -68,7 +77,8 @@ def GetSDKPath(name):
                     package = json.load(f)
 
                     if package['name'] == name:
-                        return os.path.join(sdk_pkgs, package['name'] + '-' + item['ver'])
+                        sdk = os.path.join(sdk_pkgs, package['name'] + '-' + item['ver'])
+                        return sdk
 
     # not found named package
     return None