[bsp][c908]Added support for rt-smart and mmu Sv39/48 to xiaohui c908, and added mmu_demo for test.

bsp/xuantie/xiaohui/c908/Kconfig

@@ -11,8 +11,16 @@ PKGS_DIR := packages
     select ARCH_RISCV64
     select RT_USING_COMPONENTS_INIT
     select RT_USING_USER_MAIN
+    select ARCH_MM_MMU
+    select RT_USING_CACHE
+    select ARCH_USING_BSP_SBI
+    select ARCH_REMAP_KERNEL if RT_USING_SMART
     default y
 
+ config __STACKSIZE__
+    int "stack size for interrupt"
+    default 65536
+
 menu "CPU Architecture Features"
 
     menuconfig ENABLE_FPU

bsp/xuantie/xiaohui/c908/SConstruct

@@ -1,54 +1,58 @@
 import os
 import sys
 import rtconfig
-from SCons.Script import *
+import platform
+import subprocess
 
-if os.getenv('RTT_ROOT'):
-    RTT_ROOT = os.getenv('RTT_ROOT')
-else:
-    RTT_ROOT = os.path.normpath(os.getcwd() + '/../../../..')
+from rtconfig import RTT_ROOT
+import sys
 
-sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
+def generate_ldscript(input, output):
+    if not os.path.exists(input):
+        print('Error: file', input, 'not found')
+        return
+
+    if os.path.exists(output):
+        os.remove(output)
+
+    if rtconfig.PLATFORM == 'gcc':
+
+        gcc_cmd = os.path.join(rtconfig.EXEC_PATH, rtconfig.CC)
+
+        # gcc -E -P -x c $input -o $output
+        if (platform.system() == 'Windows'):
+            child = subprocess.Popen([gcc_cmd, '-E', '-P', '-x', 'c', input, '-o', output], stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
+        else:
+            child = subprocess.Popen(gcc_cmd + f' -E -P -x c {input} -o {output}', stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
+
+        child.communicate()
+
+        print(output, 'is generated from', input)
 
-try:
-    from building import *
-except:
-    print('Cannot found RT-Thread root directory, please check RTT_ROOT')
-    print(RTT_ROOT)
-    exit(-1)
+sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
+from building import *
 
 TARGET = 'rtthread.' + rtconfig.TARGET_EXT
 
 DefaultEnvironment(tools=[])
 env = Environment(tools = ['mingw'],
     AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
-    CC = rtconfig.CC, CFLAGS = rtconfig.CFLAGS,
-    AR = rtconfig.AR, ARFLAGS = '-rc',
+    CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
     CXX = rtconfig.CXX, CXXFLAGS = rtconfig.CXXFLAGS,
+    AR = rtconfig.AR, ARFLAGS = '-rc',
     LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)
 env.PrependENVPath('PATH', rtconfig.EXEC_PATH)
+env['ASCOM'] = env['ASPPCOM']
 
 Export('RTT_ROOT')
 Export('rtconfig')
 
-SDK_ROOT = os.path.abspath('./')
-
-if os.path.exists(SDK_ROOT + '/libraries'):
-    libraries_path_prefix = SDK_ROOT + '../libraries'
-else:
-    libraries_path_prefix = os.path.dirname(SDK_ROOT) + '/../libraries'
+objs = PrepareBuilding(env, RTT_ROOT, has_libcpu = False)
 
-SDK_LIB = libraries_path_prefix
-Export('SDK_LIB')
-
-# prepare building environment
-objs = PrepareBuilding(env, RTT_ROOT, has_libcpu=True)
-
-bsp_vdir = 'build'
-library_vdir = 'build/libraries'
-
-# common include drivers
-objs.extend(SConscript(os.path.join(libraries_path_prefix, 'SConscript'), variant_dir=library_vdir, duplicate=0))
+generate_ldscript('link.lds', 'link.lds.generated')
 
 # make a building
 DoBuilding(TARGET, objs)
+
+Clean(TARGET, 'link.lds.generated')
+Clean(TARGET, 'build')

bsp/xuantie/xiaohui/c908/applications/SConscript

@@ -3,7 +3,14 @@ import os
 
 cwd     = GetCurrentDir()
 CPPPATH = [cwd]
-src = ['main.c']
+src = ['main.c', 'mnt.c',  'mmu_demo.c']
+
+# romfs_data.c is generated by tools/mkromfs.py.
+# Fall back to the placeholder image when it is absent.
+if os.path.exists(os.path.join(cwd, 'romfs_data.c')):
+    src += ['romfs_data.c']
+else:
+    src += ['romfs.c']
 
 group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH)
 

bsp/xuantie/xiaohui/c908/applications/main.c

@@ -8,17 +8,11 @@
  * 2025-04-21     Wangshun     first version
  */
 
- #include <rtthread.h>
- #include <rtdevice.h>
- #include "pre_main.h"
+#include <rtthread.h>
 
- int main(void)
- {
-     rt_kprintf("Hello RT-Thread!\r\n");
-#ifdef RT_USING_SMP
-    extern void smp_example(void);
-    smp_example();
-#endif
-     return 0;
- }
+int main(void)
+{
+    rt_kprintf("Hello RT-Thread!\r\n");
+    return 0;
+}