fit musl for riscv64 boards.

Ubiquitous/XiZi/board/xidatong-riscv64/config.mk

@@ -2,6 +2,16 @@ export CFLAGS := -mcmodel=medany -march=rv64imafdc -mabi=lp64d -fno-common -ffun
 export AFLAGS := -c -mcmodel=medany -march=rv64imafdc -mabi=lp64d -x assembler-with-cpp -ggdb
 export LFLAGS := -mcmodel=medany -march=rv64imafdc -mabi=lp64d -nostartfiles -Wl,--gc-sections,-Map=XiZi-xidatong-riscv64.map,-cref,-u,_start -T $(BSP_ROOT)/link.lds
 
+ifeq ($(CONFIG_LIB_MUSLLIB), y)
+export LFLAGS += -nostdlib -nostdinc # -fno-builtin -nodefaultlibs
+export LIBCC := -lgcc
+export LINK_MUSLLIB := $(KERNEL_ROOT)/lib/musllib/libmusl.a
+endif
+
+ifeq ($(CONFIG_RESOURCES_LWIP), y)
+export LINK_LWIP := $(KERNEL_ROOT)/resources/ethernet/LwIP/liblwip.a
+endif
+
 export APPLFLAGS := -mcmodel=medany -march=rv64imafdc -mabi=lp64d -nostartfiles -Wl,--gc-sections,-Map=XiZi-xidatong-riscv64.map,-cref,-u, -T $(BSP_ROOT)/link_userspace.lds
 
 export CXXFLAGS := -mcmodel=medany -march=rv64imafdc -mabi=lp64d -fno-common -ffunction-sections -fdata-sections -fstrict-volatile-bitfields -O0 -ggdb -Werror

Ubiquitous/XiZi/board/xidatong-riscv64/include/bsp.h

@@ -24,7 +24,7 @@
 
 #ifndef _KENDRYTE_BSP_H
 #define _KENDRYTE_BSP_H
-#include "atomic.h"
+#include "bsp_atomic.h"
 #include "entry.h"
 #include "sleep.h"
 #include "encoding.h"

Ubiquitous/XiZi/board/xidatong-riscv64/third_party_driver/uart/hardware_uart.c

@@ -28,7 +28,7 @@
 #include "sysctl.h"
 #include "hardware_uart.h"
 #include "utils.h"
-#include "atomic.h"
+#include "bsp_atomic.h"
 
 #define __UART_BRATE_CONST  16