[BSP][Nuclei] Add Nuclei RISC-V Processor support

* Nuclei RISC-V Processor support is added both RV32 and RV64 * Nuclei RVSTAR BSP is added, UART driver is added * MSH works well in RVSTAR board --------------------------- Squashed commit of the following: commit b7368bc2ed Author: Huaqi Fang <578567190@qq.com> Date: Fri Apr 17 14:38:54 2020 +0800 [BSP][Nuclei] Pretty source code Signed-off-by: Huaqi Fang <578567190@qq.com> commit 2c42a997f7 Author: Huaqi Fang <578567190@qq.com> Date: Thu Apr 16 15:51:03 2020 +0800 [libcpu] Remove ARCH_NUCLEI in libcpu kconfig Signed-off-by: Huaqi Fang <578567190@qq.com> commit 915ad4c076 Author: Huaqi Fang <578567190@qq.com> Date: Thu Apr 16 15:50:00 2020 +0800 [BSP][Nuclei] Remove ARCH_NUCLEI in bsp KConfig Signed-off-by: Huaqi Fang <578567190@qq.com> commit fe43869c79 Author: Huaqi Fang <578567190@qq.com> Date: Wed Apr 15 12:43:20 2020 +0800 [BSP][NUCLEI] Simply application main.c Remove previous complicated application of gd32vf103_rvstar Signed-off-by: Huaqi Fang <578567190@qq.com> commit 8fd31727bc Author: Huaqi Fang <578567190@qq.com> Date: Wed Apr 15 12:38:04 2020 +0800 [BSP][NUCLEI] Format application and board source code Signed-off-by: Huaqi Fang <578567190@qq.com> commit b432308b20 Author: Huaqi Fang <578567190@qq.com> Date: Wed Apr 15 11:58:28 2020 +0800 [BSP][Nuclei] Format source code of drivers of gd32vf103 Signed-off-by: Huaqi Fang <578567190@qq.com> commit 7366173d74 Author: Huaqi Fang <578567190@qq.com> Date: Wed Apr 15 11:54:02 2020 +0800 [LIBCPU][NUCLEI] Optimize nuclei cpu portable code Signed-off-by: Huaqi Fang <578567190@qq.com> commit 8c2cd4745b Author: Huaqi Fang <578567190@qq.com> Date: Tue Apr 14 15:45:42 2020 +0800 nuclei: Update README.md Signed-off-by: Huaqi Fang <578567190@qq.com> commit fa8a2f24ea Author: Huaqi Fang <578567190@qq.com> Date: Tue Apr 14 14:06:54 2020 +0800 nuclei: Add gpio driver not tested Signed-off-by: Huaqi Fang <578567190@qq.com> commit 1be40bc50b Author: Huaqi Fang <578567190@qq.com> Date: Thu Apr 9 14:55:22 2020 +0800 Nuclei: Update README.md Signed-off-by: Huaqi Fang <578567190@qq.com> commit 4c8beb204b Author: Huaqi Fang <578567190@qq.com> Date: Thu Apr 9 10:20:25 2020 +0800 Nuclei: Change idle stack size from 256 to 396 bytes If changed to 396 bytes, then debug optimization level changed from O2 to O0, and the application can run successfully without stack overflow issue of tidle0 task warning: tidle0 stack is close to end of stack address. Signed-off-by: Huaqi Fang <578567190@qq.com> commit da2bcf5c56 Author: Huaqi Fang <578567190@qq.com> Date: Thu Apr 9 10:11:40 2020 +0800 nuclei: Remove unused kconfig Signed-off-by: Huaqi Fang <578567190@qq.com> commit 0b932c677a Author: Huaqi Fang <578567190@qq.com> Date: Thu Apr 9 09:32:22 2020 +0800 nuclei: optimize drivers support Signed-off-by: Huaqi Fang <578567190@qq.com> commit 0431f6f01f Author: Huaqi Fang <578567190@qq.com> Date: Wed Apr 8 19:28:02 2020 +0800 tools: Update mkdist.py for nuclei bsp Signed-off-by: Huaqi Fang <578567190@qq.com> commit 0e1f502edf Author: Huaqi Fang <578567190@qq.com> Date: Wed Apr 8 18:46:58 2020 +0800 nuclei: optimize rvstar support directory Signed-off-by: Huaqi Fang <578567190@qq.com> commit 1131f6e648 Author: Huaqi Fang <578567190@qq.com> Date: Wed Apr 8 18:37:24 2020 +0800 nuclei: update kconfig Signed-off-by: Huaqi Fang <578567190@qq.com> commit ad81c1d3bf Author: Huaqi Fang <578567190@qq.com> Date: Wed Apr 8 15:43:00 2020 +0800 nuclei: Rename board name Signed-off-by: Huaqi Fang <578567190@qq.com> commit d780138a1a Author: Huaqi Fang <578567190@qq.com> Date: Tue Apr 7 09:36:19 2020 +0800 libcpu: Add Nuclei arch option in KConfig Signed-off-by: Huaqi Fang <578567190@qq.com> commit 60320d34b1 Author: Huaqi Fang <578567190@qq.com> Date: Fri Apr 3 16:51:01 2020 +0800 nuclei: Update nuclei sdk of rt-thread support Signed-off-by: Huaqi Fang <578567190@qq.com> commit a042b806ef Author: Huaqi Fang <578567190@qq.com> Date: Fri Apr 3 11:34:09 2020 +0800 nuclei: modify application for not print anything Signed-off-by: Huaqi Fang <578567190@qq.com> commit 2a9603adcb Author: Huaqi Fang <578567190@qq.com> Date: Fri Apr 3 11:31:01 2020 +0800 nuclei: Add .gitignore for nuclei bsp Signed-off-by: Huaqi Fang <578567190@qq.com> commit 34aaf6aeba Author: Huaqi Fang <578567190@qq.com> Date: Fri Apr 3 11:28:06 2020 +0800 nuclei_sdk: update link script of rvstar to contain rt-thread needed sections /* section information for finsh shell */ . = ALIGN(4); __fsymtab_start = .; KEEP(*(FSymTab)) __fsymtab_end = .; . = ALIGN(4); __vsymtab_start = .; KEEP(*(VSymTab)) __vsymtab_end = .; /* section information for initial. */ . = ALIGN(4); __rt_init_start = .; KEEP(*(SORT(.rti_fn*))) __rt_init_end = .; The above code placed in rodata section Signed-off-by: Huaqi Fang <578567190@qq.com> commit 3451466e9d Author: Huaqi Fang <578567190@qq.com> Date: Fri Apr 3 10:04:42 2020 +0800 bsp: Add initial commit of nuclei rvstar board bsp Signed-off-by: Huaqi Fang <578567190@qq.com> Signed-off-by: Huaqi Fang <578567190@qq.com>
2026-10-07 00:59:00 +08:00 · 2020-04-17 21:07:29 +08:00
parent f406aab4d2
commit ee4cabe69f
27 changed files with 2962 additions and 1 deletions
@@ -0,0 +1,26 @@
+*.i
+*.o
+*.d
+*.elf
+*.diss
+*.map
+*.bin
+*.log
+.vscode
+
+*.dump
+*.verilog
+
+*.swp
+*.swo
+
+prebuilt_tools/
+setup_config.sh
+setup_config.bat
+
+tags
+TAGS
+TAG
+CTAGS
+Makefile.local
+Makefile.global
@@ -0,0 +1,28 @@
+mainmenu "RT-Thread Configuration"
+
+config BSP_DIR
+    string
+    option env="BSP_ROOT"
+    default "."
+
+config RTT_DIR
+    string
+    option env="RTT_ROOT"
+    default "../../.."
+
+config PKGS_DIR
+    string
+    option env="PKGS_ROOT"
+    default "packages"
+ 
+source "$RTT_DIR/Kconfig"
+source "$PKGS_DIR/Kconfig"
+source "board/Kconfig"
+
+config SOC_GD32VF103
+    bool
+    select ARCH_RISCV32
+    select PKG_USING_NUCLEI_SDK
+    select RT_USING_COMPONENTS_INIT
+    select RT_USING_USER_MAIN
+    default y
@@ -0,0 +1,17 @@
+# for module compiling
+import os
+Import('RTT_ROOT')
+from building import *
+
+cwd = GetCurrentDir()
+objs = []
+list = os.listdir(cwd)
+
+ASFLAGS = ' -I' + cwd
+
+for d in list:
+    path = os.path.join(cwd, d)
+    if os.path.isfile(os.path.join(path, 'SConscript')):
+        objs = objs + SConscript(os.path.join(d, 'SConscript'))
+
+Return('objs')
@@ -0,0 +1,85 @@
+import os
+import sys
+import rtconfig
+
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../../..')
+
+sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
+from building import *
+
+TARGET = 'rtthread.' + rtconfig.TARGET_EXT
+
+AddOption('--run',
+        dest = 'run',
+        type='string',
+        nargs=1,
+        action = 'store',
+        default = "",
+        help = 'Upload or debug application using openocd')
+
+DefaultEnvironment(tools=[])
+env = Environment(tools = ['mingw'],
+    AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
+    CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
+    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'
+
+SDK_LIB = libraries_path_prefix
+Export('SDK_LIB')
+
+GDB = rtconfig.GDB
+
+# prepare building environment
+objs = PrepareBuilding(env, RTT_ROOT)
+
+bsp_library_type = rtconfig.NUCLEI_SDK_SOC
+rtconfig.BSP_LIBRARY_TYPE = bsp_library_type
+
+openocd_cfg = rtconfig.NUCLEI_SDK_OPENOCD_CFG.replace('\\', '/')
+
+# include hal drivers
+hal_sconscript = os.path.join(libraries_path_prefix, bsp_library_type, 'HAL_Drivers', 'SConscript')
+
+if os.path.isfile(hal_sconscript):
+    objs.extend(SConscript(hal_sconscript))
+
+# make a building
+DoBuilding(TARGET, objs)
+
+# Run upload or debug if --run=upload or --upload=debug
+run_target = GetOption('run')
+SUPPORT_RUN_TARGETS = ["upload", "debug"]
+if run_target in SUPPORT_RUN_TARGETS:
+    if os.path.isfile(TARGET):
+        if run_target == "upload":
+            upload_cmd = '{} {} -ex "set remotetimeout 240" \
+                    -ex "target remote | openocd --pipe -f {}" \
+                    --batch -ex "monitor halt" -ex "monitor flash protect 0 0 last off" -ex "load" \
+                    -ex "monitor resume" -ex "monitor shutdown" -ex "quit"'.format(GDB, TARGET, openocd_cfg)
+            print("Upload application {} using openocd and gdb".format(TARGET))
+            print(upload_cmd)
+            os.system(upload_cmd)
+        elif run_target == "debug":
+            debug_cmd = '{} {} -ex "set remotetimeout 240" \
+                    -ex "target remote | openocd --pipe -f {}"'.format(GDB, TARGET, openocd_cfg)
+            print("Debug application {} using openocd and gdb".format(TARGET))
+            print(debug_cmd)
+            os.system(debug_cmd)
+    else:
+        print(TARGET + ' not exist, please run scons first!!')
+    exit(0)
@@ -0,0 +1,11 @@
+Import('RTT_ROOT')
+Import('rtconfig')
+from building import *
+
+cwd = GetCurrentDir()
+src = Glob('*.c')
+CPPPATH = [cwd, ]
+
+group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2006-2020, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2020-04-15     hqfang       first version
+ */
+
+#include <rtthread.h>
+#include <rtdevice.h>
+
+int main(int argc, char *argv[])
+{
+    return RT_EOK;
+}
+
+/******************** end of file *******************/
@@ -0,0 +1,47 @@
+menu "Hardware Drivers Config"
+
+config SOC_GD32VF103V
+    bool
+    select SOC_SERIES_GD32VF103V
+    default y
+
+menu "Onboard Peripheral Drivers"
+
+    config BSP_USING_UART_CONSOLE
+        bool "Enable UART CONSOLE"
+        select BSP_USING_UART
+        select BSP_USING_UART4
+        default y
+endmenu
+
+menu "On-chip Peripheral Drivers"
+
+    menuconfig BSP_USING_UART
+        bool "Enable UART"
+        default y
+        select RT_USING_SERIAL
+        if BSP_USING_UART
+            config BSP_USING_UART0
+                bool "Enable UART0"
+                default n
+            config BSP_USING_UART1
+                bool "Enable UART1"
+                default n
+            config BSP_USING_UART2
+                bool "Enable UART2"
+                default n
+            config BSP_USING_UART3
+                bool "Enable UART3"
+                default n
+            config BSP_USING_UART4
+                bool "Enable UART4"
+                default n
+        endif
+
+endmenu
+
+menu "Board extended module Drivers"
+
+endmenu
+
+endmenu
@@ -0,0 +1,11 @@
+# RT-Thread building script for component
+
+from building import *
+
+cwd = GetCurrentDir()
+src = Glob('*.c')
+CPPPATH = [cwd]
+
+group = DefineGroup('Drivers', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2006-2020, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2020-04-02     hqfang       first version
+ *
+ */
+
+#include <rtthread.h>
+#include <rtdevice.h>
+#include "board.h"
+#include "cpuport.h"
+
+#ifdef RT_USING_SERIAL
+    #include <drv_usart.h>
+#endif
+
+/** _end symbol defined in linker script of Nuclei SDK */
+extern void *_end;
+
+/** _heap_end symbol defined in linker script of Nuclei SDK */
+extern void *_heap_end;
+#define HEAP_BEGIN  &_end
+#define HEAP_END    &_heap_end
+
+/*
+ * - Implemented and defined in Nuclei SDK system_<Device>.c file
+ * - Required macro NUCLEI_BANNER set to 0
+ */
+extern void _init(void);
+
+/**
+ * @brief Setup hardware board for rt-thread
+ *
+ */
+void rt_hw_board_init(void)
+{
+    /* OS Tick Configuration */
+    rt_hw_ticksetup();
+
+#ifdef RT_USING_HEAP
+    rt_system_heap_init((void *) HEAP_BEGIN, (void *) HEAP_END);
+#endif
+
+    _init(); // __libc_init_array is not used in RT-Thread
+
+    /* USART driver initialization is open by default */
+#ifdef RT_USING_SERIAL
+    rt_hw_usart_init();
+#endif
+
+    /* Set the shell console output device */
+#ifdef RT_USING_CONSOLE
+    rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
+#endif
+
+    /* Board underlying hardware initialization */
+#ifdef RT_USING_COMPONENTS_INIT
+    rt_components_board_init();
+#endif
+}
+
+/******************** end of file *******************/
+
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2006-2020, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author          Notes
+ * 2020-04-02     hqfang          first version
+ *
+ */
+
+#ifndef __BOARD__
+#define __BOARD__
+
+#include "nuclei_sdk_hal.h"
+
+void rt_hw_board_init(void);
+
+#endif /* __BOARD__ */
+
+/******************** end of file *******************/
@@ -0,0 +1,181 @@
+#ifndef RT_CONFIG_H__
+#define RT_CONFIG_H__
+
+/* Automatically generated file; DO NOT EDIT. */
+/* RT-Thread Configuration */
+
+/* RT-Thread Kernel */
+
+#define RT_NAME_MAX 8
+#define RT_ALIGN_SIZE 4
+#define RT_THREAD_PRIORITY_32
+#define RT_THREAD_PRIORITY_MAX 32
+#define RT_TICK_PER_SECOND 100
+#define RT_USING_OVERFLOW_CHECK
+#define RT_USING_HOOK
+#define RT_USING_IDLE_HOOK
+#define RT_IDLE_HOOK_LIST_SIZE 4
+#define IDLE_THREAD_STACK_SIZE 396
+#define RT_USING_TIMER_SOFT
+#define RT_TIMER_THREAD_PRIO 4
+#define RT_TIMER_THREAD_STACK_SIZE 512
+#define RT_DEBUG
+#define RT_DEBUG_COLOR
+#define RT_DEBUG_INIT_CONFIG
+#define RT_DEBUG_INIT 1
+
+/* Inter-Thread communication */
+
+#define RT_USING_SEMAPHORE
+#define RT_USING_MUTEX
+#define RT_USING_EVENT
+#define RT_USING_MAILBOX
+#define RT_USING_MESSAGEQUEUE
+
+/* Memory Management */
+
+#define RT_USING_MEMPOOL
+#define RT_USING_SMALL_MEM
+#define RT_USING_HEAP
+
+/* Kernel Device Object */
+
+#define RT_USING_DEVICE
+#define RT_USING_CONSOLE
+#define RT_CONSOLEBUF_SIZE 128
+#define RT_CONSOLE_DEVICE_NAME "uart4"
+#define RT_VER_NUM 0x40003
+#define ARCH_RISCV
+#define ARCH_RISCV32
+
+/* RT-Thread Components */
+
+#define RT_USING_COMPONENTS_INIT
+#define RT_USING_USER_MAIN
+#define RT_MAIN_THREAD_STACK_SIZE 2048
+#define RT_MAIN_THREAD_PRIORITY 10
+
+/* C++ features */
+
+
+/* Command shell */
+
+#define RT_USING_FINSH
+#define FINSH_THREAD_NAME "tshell"
+#define FINSH_USING_HISTORY
+#define FINSH_HISTORY_LINES 5
+#define FINSH_USING_SYMTAB
+#define FINSH_USING_DESCRIPTION
+#define FINSH_THREAD_PRIORITY 20
+#define FINSH_THREAD_STACK_SIZE 4096
+#define FINSH_CMD_SIZE 80
+#define FINSH_USING_MSH
+#define FINSH_USING_MSH_DEFAULT
+#define FINSH_ARG_MAX 10
+
+/* Device virtual file system */
+
+#define RT_USING_DFS
+#define DFS_USING_WORKDIR
+#define DFS_FILESYSTEMS_MAX 2
+#define DFS_FILESYSTEM_TYPES_MAX 2
+#define DFS_FD_MAX 16
+#define RT_USING_DFS_DEVFS
+
+/* Device Drivers */
+
+#define RT_USING_DEVICE_IPC
+#define RT_PIPE_BUFSZ 512
+#define RT_USING_SERIAL
+#define RT_SERIAL_USING_DMA
+#define RT_SERIAL_RB_BUFSZ 64
+#define RT_USING_PIN
+
+/* Using USB */
+
+
+/* POSIX layer and C standard library */
+
+#define RT_USING_LIBC
+#define RT_USING_POSIX
+
+/* Network */
+
+/* Socket abstraction layer */
+
+
+/* Network interface device */
+
+
+/* light weight TCP/IP stack */
+
+
+/* AT commands */
+
+
+/* VBUS(Virtual Software BUS) */
+
+
+/* Utilities */
+
+
+/* RT-Thread online packages */
+
+/* IoT - internet of things */
+
+
+/* Wi-Fi */
+
+/* Marvell WiFi */
+
+
+/* Wiced WiFi */
+
+
+/* IoT Cloud */
+
+
+/* security packages */
+
+
+/* language packages */
+
+
+/* multimedia packages */
+
+
+/* tools packages */
+
+
+/* system packages */
+
+
+/* peripheral libraries and drivers */
+
+#define PKG_USING_NUCLEI_SDK
+#define PKG_USING_NUCLEI_SDK_LATEST_VERSION
+
+/* miscellaneous packages */
+
+
+/* samples: kernel and components samples */
+
+
+/* Hardware Drivers Config */
+
+#define SOC_GD32VF103V
+
+/* Onboard Peripheral Drivers */
+
+#define BSP_USING_UART_CONSOLE
+
+/* On-chip Peripheral Drivers */
+
+#define BSP_USING_UART
+#define BSP_USING_UART4
+
+/* Board extended module Drivers */
+
+#define SOC_GD32VF103
+
+#endif
@@ -0,0 +1,58 @@
+import os
+
+# toolchains options
+ARCH='risc-v'
+CPU='nuclei'
+CROSS_TOOL='gcc'
+
+if os.getenv('RTT_CC'):
+    CROSS_TOOL = os.getenv('RTT_CC')
+
+if CROSS_TOOL == 'gcc':
+    PLATFORM  = 'gcc'
+    EXEC_PATH = 'D:/Software/Nuclei/gcc/bin'
+else:
+    print("CROSS_TOOL = {} not yet supported" % CROSS_TOOL)
+
+# if os.getenv('RTT_EXEC_PATH'):
+#     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
+BUILD = 'debug'
+# Fixed configurations below
+NUCLEI_SDK_SOC = "gd32vf103"
+NUCLEI_SDK_BOARD = "gd32vf103v_rvstar"
+NUCLEI_SDK_DOWNLOAD = "flashxip"
+NUCLEI_SDK_CORE = "n205"
+
+if PLATFORM == 'gcc':
+    # toolchains
+    PREFIX  = 'riscv-nuclei-elf-'
+    CC      = PREFIX + 'gcc'
+    CXX     = PREFIX + 'g++'
+    AS      = PREFIX + 'gcc'
+    AR      = PREFIX + 'ar'
+    LINK    = PREFIX + 'gcc'
+    GDB     = PREFIX + 'gdb'
+    TARGET_EXT = 'elf'
+    SIZE    = PREFIX + 'size'
+    OBJDUMP = PREFIX + 'objdump'
+    OBJCPY  = PREFIX + 'objcopy'
+
+    CFLAGS  = ' -ffunction-sections -fdata-sections -fno-common '
+    AFLAGS  = CFLAGS
+    LFLAGS  = ' --specs=nano.specs --specs=nosys.specs -nostartfiles -Wl,--gc-sections '
+    LFLAGS += ' -Wl,-cref,-Map=rtthread.map'
+    LFLAGS  += ' -u _isatty -u _write -u _sbrk -u _read -u _close -u _fstat -u _lseek '
+    CPATH   = ''
+    LPATH   = ''
+
+    if BUILD == 'debug':
+        CFLAGS += ' -O0 -ggdb'
+        AFLAGS += ' -ggdb'
+    else:
+        CFLAGS += ' -O2 -Os'
+
+    CXXFLAGS = CFLAGS
+
+DUMP_ACTION = OBJDUMP + ' -D -S $TARGET > rtt.asm\n'
+POST_ACTION = OBJCPY + ' -O binary $TARGET rtthread.bin\n' + SIZE + ' $TARGET \n'
@@ -0,0 +1,21 @@
+Import('RTT_ROOT')
+Import('rtconfig')
+from building import *
+
+cwd = GetCurrentDir()
+
+# add the general drivers.
+src = Split("""
+""")
+
+if GetDepend(['RT_USING_PIN']):
+    src += ['drv_gpio.c']
+
+if GetDepend(['RT_USING_SERIAL']):
+    src += ['drv_usart.c']
+
+path =  [cwd]
+
+group = DefineGroup('Drivers', src, depend = [''], CPPPATH = path)
+
+Return('group')
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2006-2020, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2020-04-08     hqfang            first version
+ */
+
+#ifndef __DRV_CONFIG_H__
+#define __DRV_CONFIG_H__
+
+#include <board.h>
+#include <rtthread.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2006-2020, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2018-11-06     balanceTWK        first version
+ * 2020-04-15     hqfang            Modify for gd32vf103
+ */
+
+#ifndef __DRV_GPIO_H__
+#define __DRV_GPIO_H__
+
+#include <rtthread.h>
+#include <rtdevice.h>
+#include <rthw.h>
+#include <drv_config.h>
+
+#define __GD32_PORT(port)  GPIO##port
+
+#define GET_PIN(PORTx,PIN) (rt_base_t)((16 * ( ((rt_base_t)__GD32_PORT(PORTx) - (rt_base_t)GPIOA)/(0x0400UL) )) + PIN)
+
+#define __GD32_PIN(index, gpio, gpio_index)                                \
+    {                                                                      \
+        index, GPIO##gpio, GPIO_PIN_##gpio_index                           \
+    }
+
+#define __GD32_PIN_RESERVE                                                 \
+    {                                                                      \
+        -1, 0, 0                                                           \
+    }
+
+/* GD32 GPIO driver */
+struct pin_index
+{
+    int index;
+    uint32_t gpio;
+    uint32_t pin;
+};
+
+struct pin_irq_map
+{
+    rt_uint16_t pinbit;
+    IRQn_Type irqno;
+};
+
+int rt_hw_pin_init(void);
+
+#endif /* __DRV_GPIO_H__ */
+
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2006-2020, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2020-04-15     hqfang       first version
+ */
+#ifndef __DRV_UART_H__
+#define __DRV_UART_H__
+
+#include <rtthread.h>
+#include <rtdevice.h>
+#include <drv_config.h>
+
+/* gd32 config class */
+struct gd32_uart_config
+{
+    const char *name;
+    uint32_t uart_base;
+    IRQn_Type irqn;
+};
+
+/* gd32 uart dirver class */
+struct gd32_uart
+{
+    struct gd32_uart_config *config;
+    struct rt_serial_device serial;
+};
+
+int rt_hw_usart_init(void);
+
+#endif /* __DRV_USART_H__ */
+
+/******************* end of file *******************/
@@ -10,7 +10,8 @@ group = []
 list  = os.listdir(cwd)

 # add common code files
-group = group + SConscript(os.path.join('common', 'SConscript'))
+if rtconfig.CPU != "nuclei":
+    group = group + SConscript(os.path.join('common', 'SConscript'))

 # cpu porting code files
 group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
@@ -0,0 +1,14 @@
+# RT-Thread building script for component
+
+from building import *
+
+Import('rtconfig')
+
+cwd     = GetCurrentDir()
+src     = Glob('*.c') + Glob('*.cpp') + Glob('*_gcc.S')
+CPPPATH = [cwd]
+ASFLAGS = ''
+
+group = DefineGroup('cpu', src, depend = [''], CPPPATH = CPPPATH, ASFLAGS = ASFLAGS)
+
+Return('group')
@@ -0,0 +1,188 @@
+/*
+ * Copyright (c) 2019-Present Nuclei Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2020/03/26     Huaqi        First Nuclei RISC-V porting implementation
+ */
+
+#include "riscv_encoding.h"
+
+#ifndef __riscv_32e
+#define RT_SAVED_REGNUM         30
+#else
+#define RT_SAVED_REGNUM         14
+#endif
+
+#define RT_CONTEXT_SIZE         (RT_SAVED_REGNUM * REGBYTES)
+
+    .extern rt_interrupt_from_thread
+    .extern rt_interrupt_to_thread
+
+
+.section    .text
+
+
+/*
+ * void rt_hw_context_switch_to(rt_ubase_t to);
+ * a0 --> to_thread
+ */
+    .globl rt_hw_context_switch_to
+
+/* Start the first task.  This also clears the bit that indicates the FPU is
+	in use in case the FPU was used before the scheduler was started - which
+	would otherwise result in the unnecessary leaving of space in the stack
+	for lazy saving of FPU registers. */
+.align 3
+rt_hw_context_switch_to:
+    /* Setup Interrupt Stack using
+       The stack that was used by main()
+       before the scheduler is started is
+       no longer required after the scheduler is started.
+       Interrupt stack pointer is stored in CSR_MSCRATCH */
+    la t0, _sp
+    csrw CSR_MSCRATCH, t0
+    LOAD sp, 0x0(a0)                /* Read sp from first TCB member(a0) */
+
+    /* Pop PC from stack and set MEPC */
+    LOAD t0,  0  * REGBYTES(sp)
+    csrw CSR_MEPC, t0
+    /* Pop mstatus from stack and set it */
+    LOAD t0,  (RT_SAVED_REGNUM - 1)  * REGBYTES(sp)
+    csrw CSR_MSTATUS, t0
+    /* Interrupt still disable here */
+    /* Restore Registers from Stack */
+    LOAD x1,  1  * REGBYTES(sp)    /* RA */
+    LOAD x5,  2  * REGBYTES(sp)
+    LOAD x6,  3  * REGBYTES(sp)
+    LOAD x7,  4  * REGBYTES(sp)
+    LOAD x8,  5  * REGBYTES(sp)
+    LOAD x9,  6  * REGBYTES(sp)
+    LOAD x10, 7  * REGBYTES(sp)
+    LOAD x11, 8  * REGBYTES(sp)
+    LOAD x12, 9  * REGBYTES(sp)
+    LOAD x13, 10 * REGBYTES(sp)
+    LOAD x14, 11 * REGBYTES(sp)
+    LOAD x15, 12 * REGBYTES(sp)
+#ifndef __riscv_32e
+    LOAD x16, 13 * REGBYTES(sp)
+    LOAD x17, 14 * REGBYTES(sp)
+    LOAD x18, 15 * REGBYTES(sp)
+    LOAD x19, 16 * REGBYTES(sp)
+    LOAD x20, 17 * REGBYTES(sp)
+    LOAD x21, 18 * REGBYTES(sp)
+    LOAD x22, 19 * REGBYTES(sp)
+    LOAD x23, 20 * REGBYTES(sp)
+    LOAD x24, 21 * REGBYTES(sp)
+    LOAD x25, 22 * REGBYTES(sp)
+    LOAD x26, 23 * REGBYTES(sp)
+    LOAD x27, 24 * REGBYTES(sp)
+    LOAD x28, 25 * REGBYTES(sp)
+    LOAD x29, 26 * REGBYTES(sp)
+    LOAD x30, 27 * REGBYTES(sp)
+    LOAD x31, 28 * REGBYTES(sp)
+#endif
+
+    addi sp, sp, RT_CONTEXT_SIZE
+
+    mret
+
+.align 2
+.global eclic_msip_handler
+eclic_msip_handler:
+    addi sp, sp, -RT_CONTEXT_SIZE
+    STORE x1,  1  * REGBYTES(sp)    /* RA */
+    STORE x5,  2  * REGBYTES(sp)
+    STORE x6,  3  * REGBYTES(sp)
+    STORE x7,  4  * REGBYTES(sp)
+    STORE x8,  5  * REGBYTES(sp)
+    STORE x9,  6  * REGBYTES(sp)
+    STORE x10, 7  * REGBYTES(sp)
+    STORE x11, 8  * REGBYTES(sp)
+    STORE x12, 9  * REGBYTES(sp)
+    STORE x13, 10 * REGBYTES(sp)
+    STORE x14, 11 * REGBYTES(sp)
+    STORE x15, 12 * REGBYTES(sp)
+#ifndef __riscv_32e
+    STORE x16, 13 * REGBYTES(sp)
+    STORE x17, 14 * REGBYTES(sp)
+    STORE x18, 15 * REGBYTES(sp)
+    STORE x19, 16 * REGBYTES(sp)
+    STORE x20, 17 * REGBYTES(sp)
+    STORE x21, 18 * REGBYTES(sp)
+    STORE x22, 19 * REGBYTES(sp)
+    STORE x23, 20 * REGBYTES(sp)
+    STORE x24, 21 * REGBYTES(sp)
+    STORE x25, 22 * REGBYTES(sp)
+    STORE x26, 23 * REGBYTES(sp)
+    STORE x27, 24 * REGBYTES(sp)
+    STORE x28, 25 * REGBYTES(sp)
+    STORE x29, 26 * REGBYTES(sp)
+    STORE x30, 27 * REGBYTES(sp)
+    STORE x31, 28 * REGBYTES(sp)
+#endif
+    /* Push mstatus to stack */
+    csrr t0, CSR_MSTATUS
+    STORE t0,  (RT_SAVED_REGNUM - 1)  * REGBYTES(sp)
+
+    /* Push additional registers */
+
+    /* Store sp to task stack */
+    LOAD t0, rt_interrupt_from_thread
+    STORE sp, 0(t0)
+
+    csrr t0, CSR_MEPC
+    STORE t0, 0(sp)
+
+    jal rt_hw_taskswitch
+
+    /* Switch task context */
+    LOAD t0, rt_interrupt_to_thread
+    LOAD sp, 0x0(t0)
+
+    /* Pop PC from stack and set MEPC */
+    LOAD t0,  0  * REGBYTES(sp)
+    csrw CSR_MEPC, t0
+
+    /* Pop additional registers */
+
+    /* Pop mstatus from stack and set it */
+    LOAD t0,  (RT_SAVED_REGNUM - 1)  * REGBYTES(sp)
+    csrw CSR_MSTATUS, t0
+    /* Interrupt still disable here */
+    /* Restore Registers from Stack */
+    LOAD x1,  1  * REGBYTES(sp)    /* RA */
+    LOAD x5,  2  * REGBYTES(sp)
+    LOAD x6,  3  * REGBYTES(sp)
+    LOAD x7,  4  * REGBYTES(sp)
+    LOAD x8,  5  * REGBYTES(sp)
+    LOAD x9,  6  * REGBYTES(sp)
+    LOAD x10, 7  * REGBYTES(sp)
+    LOAD x11, 8  * REGBYTES(sp)
+    LOAD x12, 9  * REGBYTES(sp)
+    LOAD x13, 10 * REGBYTES(sp)
+    LOAD x14, 11 * REGBYTES(sp)
+    LOAD x15, 12 * REGBYTES(sp)
+#ifndef __riscv_32e
+    LOAD x16, 13 * REGBYTES(sp)
+    LOAD x17, 14 * REGBYTES(sp)
+    LOAD x18, 15 * REGBYTES(sp)
+    LOAD x19, 16 * REGBYTES(sp)
+    LOAD x20, 17 * REGBYTES(sp)
+    LOAD x21, 18 * REGBYTES(sp)
+    LOAD x22, 19 * REGBYTES(sp)
+    LOAD x23, 20 * REGBYTES(sp)
+    LOAD x24, 21 * REGBYTES(sp)
+    LOAD x25, 22 * REGBYTES(sp)
+    LOAD x26, 23 * REGBYTES(sp)
+    LOAD x27, 24 * REGBYTES(sp)
+    LOAD x28, 25 * REGBYTES(sp)
+    LOAD x29, 26 * REGBYTES(sp)
+    LOAD x30, 27 * REGBYTES(sp)
+    LOAD x31, 28 * REGBYTES(sp)
+#endif
+
+    addi sp, sp, RT_CONTEXT_SIZE
+    mret
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2019-Present Nuclei Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2020/03/26     hqfang       Nuclei RISC-V Core porting code.
+ */
+
+#ifndef __CPUPORT_H__
+#define __CPUPORT_H__
+
+#include <rtconfig.h>
+#include <nuclei_sdk_soc.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Scheduler utilities. */
+#define RT_YIELD()                                                              \
+{                                                                               \
+    /* Set a software interrupt(SWI) request to request a context switch. */    \
+    SysTimer_SetSWIRQ();                                                        \
+    /* Barriers are normally not required but do ensure the code is completely  \
+    within the specified behaviour for the architecture. */                     \
+    __RWMB();                                                                   \
+    __FENCE_I();                                                                \
+}
+
+extern void rt_hw_ticksetup(void);
+extern void rt_hw_taskswitch(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
@@ -345,6 +345,13 @@ def MkDist(program, BSP_ROOT, RTT_ROOT, Env, rttide = None):
        bsp_copy_files(os.path.join(library_path, Env['bsp_lib_type']), os.path.join(library_dir, Env['bsp_lib_type']))
        shutil.copyfile(os.path.join(library_path, 'Kconfig'), os.path.join(library_dir, 'Kconfig'))

+    # copy nuclei bsp libiary files
+    if os.path.basename(os.path.dirname(BSP_ROOT)) == 'nuclei':
+        print("=> copy nuclei bsp library")
+        library_path = os.path.join(os.path.dirname(BSP_ROOT), 'libraries')
+        library_dir  = os.path.join(dist_dir, 'libraries')
+        bsp_copy_files(os.path.join(library_path, Env['bsp_lib_type']), os.path.join(library_dir, Env['bsp_lib_type']))
+
    # do bsp special dist handle
    if 'dist_handle' in Env:
        print("=> start dist handle")