diff --git a/bsp/ls2kdev/.config b/bsp/ls2kdev/.config
index 00b8746e4f..20cf03b625 100644
--- a/bsp/ls2kdev/.config
+++ b/bsp/ls2kdev/.config
@@ -21,11 +21,12 @@ CONFIG_RT_USING_IDLE_HOOK=y
 CONFIG_RT_IDLE_HOOK_LIST_SIZE=4
 CONFIG_IDLE_THREAD_STACK_SIZE=2048
 CONFIG_RT_USING_TIMER_SOFT=y
-CONFIG_RT_TIMER_THREAD_PRIO=4
+CONFIG_RT_TIMER_THREAD_PRIO=20
 CONFIG_RT_TIMER_THREAD_STACK_SIZE=2048
 CONFIG_RT_DEBUG=y
 # CONFIG_RT_DEBUG_COLOR is not set
-# CONFIG_RT_DEBUG_INIT_CONFIG is not set
+CONFIG_RT_DEBUG_INIT_CONFIG=y
+CONFIG_RT_DEBUG_INIT=1
 # CONFIG_RT_DEBUG_THREAD_CONFIG is not set
 # CONFIG_RT_DEBUG_SCHEDULER_CONFIG is not set
 # CONFIG_RT_DEBUG_IPC_CONFIG is not set
@@ -106,18 +107,7 @@ CONFIG_FINSH_ARG_MAX=10
 #
 # Device virtual file system
 #
-CONFIG_RT_USING_DFS=y
-CONFIG_DFS_USING_WORKDIR=y
-CONFIG_DFS_FILESYSTEMS_MAX=2
-CONFIG_DFS_FILESYSTEM_TYPES_MAX=2
-CONFIG_DFS_FD_MAX=16
-# CONFIG_RT_USING_DFS_MNTTABLE is not set
-# CONFIG_RT_USING_DFS_ELMFAT is not set
-CONFIG_RT_USING_DFS_DEVFS=y
-# CONFIG_RT_USING_DFS_ROMFS is not set
-# CONFIG_RT_USING_DFS_RAMFS is not set
-# CONFIG_RT_USING_DFS_UFFS is not set
-# CONFIG_RT_USING_DFS_JFFS2 is not set
+# CONFIG_RT_USING_DFS is not set
 
 #
 # Device Drivers
@@ -161,10 +151,6 @@ CONFIG_RT_USING_PIN=y
 #
 CONFIG_RT_USING_LIBC=y
 # CONFIG_RT_USING_PTHREADS is not set
-CONFIG_RT_USING_POSIX=y
-# CONFIG_RT_USING_POSIX_MMAP is not set
-# CONFIG_RT_USING_POSIX_TERMIOS is not set
-# CONFIG_RT_USING_POSIX_AIO is not set
 # CONFIG_RT_USING_MODULE is not set
 
 #
diff --git a/bsp/ls2kdev/drivers/board.c b/bsp/ls2kdev/drivers/board.c
index 3edbae9ee7..20b7a84516 100644
--- a/bsp/ls2kdev/drivers/board.c
+++ b/bsp/ls2kdev/drivers/board.c
@@ -70,10 +70,10 @@ void rt_hw_board_init(void)
     /* init hardware interrupt */
     rt_hw_interrupt_init();
 
-    #ifdef RT_USING_FPU
+#ifdef RT_USING_FPU
     /* init hardware fpu */
     rt_hw_fpu_init();
-    #endif
+#endif
 
 #ifdef RT_USING_SERIAL
     /* init hardware UART device */
@@ -88,8 +88,7 @@ void rt_hw_board_init(void)
 
     /* init operating system timer */
     rt_hw_timer_init();
-
-
+    
 #ifdef RT_USING_COMPONENTS_INIT
     rt_components_board_init();
 #endif
diff --git a/bsp/ls2kdev/drivers/board.h b/bsp/ls2kdev/drivers/board.h
index df4b40fb78..6e2f85ec74 100644
--- a/bsp/ls2kdev/drivers/board.h
+++ b/bsp/ls2kdev/drivers/board.h
@@ -16,7 +16,7 @@
 extern unsigned char __bss_end;
 
 #define CPU_HZ	(100 * 1000 * 1000)
-#define RT_HW_HEAP_BEGIN    (void*)&__bss_end
+#define RT_HW_HEAP_BEGIN    KSEG1BASE//(void*)&__bss_end
 #define RT_HW_HEAP_END      (void*)(RT_HW_HEAP_BEGIN + 64 * 1024 * 1024)
 
 void rt_hw_board_init(void);
diff --git a/bsp/ls2kdev/mipssim_ram.lds b/bsp/ls2kdev/ls2k_ram.lds
similarity index 99%
rename from bsp/ls2kdev/mipssim_ram.lds
rename to bsp/ls2kdev/ls2k_ram.lds
index 70385101c1..8bec1e855b 100644
--- a/bsp/ls2kdev/mipssim_ram.lds
+++ b/bsp/ls2kdev/ls2k_ram.lds
@@ -14,7 +14,7 @@ GROUP(-lgcc -lc)
 ENTRY(_start)
 SECTIONS
 {
-    . = 0x80200000 ;
+    . = 0xffffffff82000000 ;
     .text :
     {
         __ebase_entry = .;
diff --git a/bsp/ls2kdev/rtconfig.h b/bsp/ls2kdev/rtconfig.h
index f53fcc66f4..80f068c5c0 100644
--- a/bsp/ls2kdev/rtconfig.h
+++ b/bsp/ls2kdev/rtconfig.h
@@ -17,9 +17,11 @@
 #define RT_IDLE_HOOK_LIST_SIZE 4
 #define IDLE_THREAD_STACK_SIZE 2048
 #define RT_USING_TIMER_SOFT
-#define RT_TIMER_THREAD_PRIO 4
+#define RT_TIMER_THREAD_PRIO 20
 #define RT_TIMER_THREAD_STACK_SIZE 2048
 #define RT_DEBUG
+#define RT_DEBUG_INIT_CONFIG
+#define RT_DEBUG_INIT 1
 
 /* Inter-Thread communication */
 
@@ -71,12 +73,6 @@
 
 /* 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 */
 
@@ -93,7 +89,6 @@
 /* POSIX layer and C standard library */
 
 #define RT_USING_LIBC
-#define RT_USING_POSIX
 
 /* Network */
 
diff --git a/bsp/ls2kdev/rtconfig.py b/bsp/ls2kdev/rtconfig.py
index f3e3786525..c8490a382f 100644
--- a/bsp/ls2kdev/rtconfig.py
+++ b/bsp/ls2kdev/rtconfig.py
@@ -40,10 +40,10 @@ OBJDUMP = PREFIX + 'objdump'
 OBJCPY = PREFIX + 'objcopy'
 READELF = PREFIX + 'readelf'
 
-DEVICE = ' -march=mips64r2 -mabi=64 -msoft-float'
-CFLAGS = DEVICE + ' -EL -G0 -mno-abicalls -fno-pic -fno-builtin -fno-exceptions -ffunction-sections -fomit-frame-pointer'
-AFLAGS = ' -c' + DEVICE + ' -EL -fno-pic -fno-builtin -mno-abicalls -x assembler-with-cpp'
-LFLAGS = DEVICE + ' -nostartfiles -EL -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,Reset_Handler -T mipssim_ram.lds'
+DEVICE = ' -march=mips64r2 -mabi=64 -msoft-float -EL'
+CFLAGS = DEVICE + '  -G0 -mno-abicalls -fno-pic -fno-builtin -fno-exceptions -ffunction-sections -fomit-frame-pointer'
+AFLAGS = ' -c' + DEVICE + '  -fno-pic -fno-builtin -mno-abicalls -x assembler-with-cpp'
+LFLAGS = DEVICE + ' -nostartfiles -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,Reset_Handler -T ls2k_ram.lds'
 CXXFLAGS = CFLAGS
 
 CPATH = ''
diff --git a/libcpu/mips/common/asm.h b/libcpu/mips/common/asm.h
index 987a1fb2b6..a16db1868e 100644
--- a/libcpu/mips/common/asm.h
+++ b/libcpu/mips/common/asm.h
@@ -261,7 +261,11 @@ symbol		=	value
 #define LONG_SRAV	srav
 
 #define LONG		.word
+#ifdef ARCH_MIPS64
+#define LONGSIZE	8
+#else
 #define LONGSIZE	4
+#endif
 #define LONGMASK	3
 #define LONGLOG		2
 
diff --git a/libcpu/mips/common/context_gcc.S b/libcpu/mips/common/context_gcc.S
index 251fc81c3c..cdcdede39a 100644
--- a/libcpu/mips/common/context_gcc.S
+++ b/libcpu/mips/common/context_gcc.S
@@ -25,11 +25,11 @@
  */
     .globl rt_hw_context_switch
 rt_hw_context_switch:
-    mtc0    ra, CP0_EPC
+    MTC0    ra, CP0_EPC
     SAVE_ALL
 
-    sw      sp, 0(a0)       /* store sp in preempted tasks TCB */
-    lw      sp, 0(a1)       /* get new task stack pointer */
+    REG_S      sp, 0(a0)       /* store sp in preempted tasks TCB */
+    REG_L      sp, 0(a1)       /* get new task stack pointer */
 
     RESTORE_ALL_AND_RET
 
@@ -39,7 +39,7 @@ rt_hw_context_switch:
  */
     .globl rt_hw_context_switch_to
 rt_hw_context_switch_to:
-    lw      sp, 0(a0)       /* get new task stack pointer */
+    REG_L      sp, 0(a0)       /* get new task stack pointer */
     RESTORE_ALL_AND_RET
 
 /*
@@ -50,17 +50,17 @@ rt_hw_context_switch_to:
     .globl rt_interrupt_to_thread
     .globl rt_hw_context_switch_interrupt
 rt_hw_context_switch_interrupt:
-    la      t0, rt_thread_switch_interrupt_flag
-    lw      t1, 0(t0)
+    PTR_LA      t0, rt_thread_switch_interrupt_flag
+    REG_L       t1, 0(t0)
     nop
     bnez    t1, _reswitch
     nop
     li      t1, 0x01                       /* set rt_thread_switch_interrupt_flag to 1 */
     sw      t1, 0(t0)
-    la      t0, rt_interrupt_from_thread   /* set rt_interrupt_from_thread */
+    PTR_LA      t0, rt_interrupt_from_thread   /* set rt_interrupt_from_thread */
     sw      a0, 0(t0)
 _reswitch:
-    la      t0, rt_interrupt_to_thread     /* set rt_interrupt_to_thread */
+    PTR_LA      t0, rt_interrupt_to_thread     /* set rt_interrupt_to_thread */
     sw      a1, 0(t0)
     jr      ra
     nop
@@ -78,7 +78,7 @@ mips_irq_handle:
     /* let k0 keep the current context sp */
     move    k0, sp
     /* switch to kernel stack */
-    la      sp, _system_stack
+    PTR_LA  sp, _system_stack
 
     jal     rt_interrupt_enter
     nop
@@ -96,7 +96,7 @@ mips_irq_handle:
     * if rt_thread_switch_interrupt_flag set, jump to
     * rt_hw_context_switch_interrupt_do and do not return
     */
-    la      k0, rt_thread_switch_interrupt_flag
+    PTR_LA  k0, rt_thread_switch_interrupt_flag
     lw      k1, 0(k0)
     beqz    k1, spurious_interrupt
     nop
@@ -106,12 +106,12 @@ mips_irq_handle:
     /*
     * switch to the new thread
     */
-    la      k0, rt_interrupt_from_thread
+    PTR_LA  k0, rt_interrupt_from_thread
     lw      k1, 0(k0)
     nop
     sw      sp, 0(k1)                       /* store sp in preempted task TCB */
 
-    la      k0, rt_interrupt_to_thread
+    PTR_LA  k0, rt_interrupt_to_thread
     lw      k1, 0(k0)
     nop
     lw      sp, 0(k1)                       /* get new task stack pointer */
diff --git a/libcpu/mips/common/entry_gcc.S b/libcpu/mips/common/entry_gcc.S
index 757774cfd9..d1a0704809 100644
--- a/libcpu/mips/common/entry_gcc.S
+++ b/libcpu/mips/common/entry_gcc.S
@@ -31,8 +31,8 @@ _start:
     PTR_LA	ra, _rtthread_entry
 
     /* disable interrupt */
-    mtc0	zero, CP0_CAUSE
-    mtc0	zero, CP0_STATUS	# Set CPU to disable interrupt.
+    MTC0	zero, CP0_CAUSE
+    MTC0	zero, CP0_STATUS	# Set CPU to disable interrupt.
     ehb
 
 #ifdef ARCH_MIPS64
diff --git a/libcpu/mips/common/exception.c b/libcpu/mips/common/exception.c
index de67e98199..11192955cf 100644
--- a/libcpu/mips/common/exception.c
+++ b/libcpu/mips/common/exception.c
@@ -19,10 +19,10 @@
 
 /*@{*/
 
-extern rt_uint32_t __ebase_entry;
-rt_uint32_t rt_interrupt_from_thread;
-rt_uint32_t rt_interrupt_to_thread;
-rt_uint32_t rt_thread_switch_interrupt_flag;
+extern rt_ubase_t __ebase_entry;
+rt_ubase_t rt_interrupt_from_thread;
+rt_ubase_t rt_interrupt_to_thread;
+rt_ubase_t rt_thread_switch_interrupt_flag;
 
 rt_base_t rt_hw_interrupt_disable(void)
 {
@@ -101,7 +101,10 @@ static void install_default_exception_handler(void)
 
 int rt_hw_exception_init(void)
 {
-    rt_uint32_t ebase = (rt_uint32_t)&__ebase_entry;
+    rt_ubase_t ebase = (rt_ubase_t)&__ebase_entry;
+#ifdef ARCH_MIPS64
+    ebase |= 0xffffffff00000000;
+#endif
     write_c0_ebase(ebase);
     clear_c0_status(ST0_BEV | ST0_ERL | ST0_EXL);
     clear_c0_status(ST0_IM | ST0_IE);
@@ -114,12 +117,12 @@ int rt_hw_exception_init(void)
 
 void rt_general_exc_dispatch(struct pt_regs *regs)
 {
-    rt_uint32_t cause, exccode;
+    rt_ubase_t cause, exccode;
 
     exccode = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE;
 
     if (exccode == 0) {
-        rt_uint32_t status, pending;
+        rt_ubase_t status, pending;
         status = read_c0_status();
         pending = (cause & CAUSEF_IP) & (status & ST0_IM);
         if (pending & CAUSEF_IP0)
diff --git a/libcpu/mips/common/exception_gcc.S b/libcpu/mips/common/exception_gcc.S
index 176b60e594..9664438ac1 100644
--- a/libcpu/mips/common/exception_gcc.S
+++ b/libcpu/mips/common/exception_gcc.S
@@ -7,6 +7,11 @@
  * Date           Author       Notes
  * 2019-12-04     Jiaxun Yang  Initial version
  */
+#ifndef __ASSEMBLY__
+#define __ASSEMBLY__
+#endif
+
+#include <mips.h>
 
     .section ".exc_vectors", "ax"
     .extern tlb_refill_handler
@@ -45,15 +50,15 @@ irq_exception:
     /* general exception handler */
 _general_exception_handler:
     .set	noreorder
-    la	$k0, mips_irq_handle
-    jr	$k0
+    PTR_LA	k0, mips_irq_handle
+    jr	k0
     nop
     .set	reorder
 
     /* interrupt handler */
 _irq_handler:
     .set	noreorder
-    la	$k0, mips_irq_handle
-    jr	$k0
+    PTR_LA	k0, mips_irq_handle
+    jr	k0
     nop
     .set	reorder
diff --git a/libcpu/mips/common/mips_addrspace.h b/libcpu/mips/common/mips_addrspace.h
index b057e1e917..f3bb60662e 100644
--- a/libcpu/mips/common/mips_addrspace.h
+++ b/libcpu/mips/common/mips_addrspace.h
@@ -75,6 +75,12 @@
 #define CKSEG2ADDR(a)		(CPHYSADDR(a) | CKSEG2)
 #define CKSEG3ADDR(a)		(CPHYSADDR(a) | CKSEG3)
 
+#define KUSEGBASE			0xffffffff00000000
+#define KSEG0BASE			0xffffffff80000000
+#define KSEG1BASE			0xffffffffa0000000
+#define KSEG2BASE			0xffffffffc0000000
+#define KSEG3BASE			0xffffffffe0000000
+
 #else
 
 #define CKSEG0ADDR(a)		(CPHYSADDR(a) | KSEG0BASE)
@@ -96,8 +102,6 @@
 #define CKSEG2			0xc0000000
 #define CKSEG3			0xe0000000
 
-#endif
-
 /*
  * Memory segments (32bit kernel mode addresses)
  * These are the traditional names used in the 32-bit universe.
@@ -108,6 +112,7 @@
 #define KSEG2BASE			0xc0000000
 #define KSEG3BASE			0xe0000000
 
+#endif
 
 
 /*
diff --git a/libcpu/mips/common/mips_regs.h b/libcpu/mips/common/mips_regs.h
index 7e1359fa33..a7db15d2ad 100644
--- a/libcpu/mips/common/mips_regs.h
+++ b/libcpu/mips/common/mips_regs.h
@@ -10,13 +10,14 @@
 
 #ifndef _MIPS_REGS_H_
 #define _MIPS_REGS_H_
-
+#include <rtconfig.h>
 #define REG_A0	4
 #define REG_SP	29
 #define REG_GP	28
 #define REG_FP	30
 #define REG_RA	31
 
+#ifdef ARCH_MIPS64
 #define zero	$0	/* wired zero */
 #define AT	$1	/* assembler temp  - uppercase because of ".set at" */
 #define v0	$2	/* return value */
@@ -56,6 +57,49 @@
 #define s8	$30	/* same like fp! */
 #define ra	$31	/* return address */
 
+#else
+
+#define zero	$0	/* wired zero */
+#define AT	$at	/* assembler temp - uppercase because of ".set at" */
+#define v0	$2	/* return value - caller saved */
+#define v1	$3
+#define a0	$4	/* argument registers */
+#define a1	$5
+#define a2	$6
+#define a3	$7
+#define a4	$8	/* arg reg 64 bit; caller saved in 32 bit */
+#define ta0	$8
+#define a5	$9
+#define ta1	$9
+#define a6	$10
+#define ta2	$10
+#define a7	$11
+#define ta3	$11
+#define t0	$12	/* caller saved */
+#define t1	$13
+#define t2	$14
+#define t3	$15
+#define s0	$16	/* callee saved */
+#define s1	$17
+#define s2	$18
+#define s3	$19
+#define s4	$20
+#define s5	$21
+#define s6	$22
+#define s7	$23
+#define t8	$24	/* caller saved */
+#define t9	$25	/* callee address for PIC/temp */
+#define jp	$25	/* PIC jump register */
+#define k0	$26	/* kernel temporary */
+#define k1	$27
+#define gp	$28	/* global pointer - caller saved for PIC */
+#define sp	$29	/* stack pointer */
+#define fp	$30	/* frame pointer */
+#define s8	$30	/* callee saved */
+#define ra	$31	/* return address */
+
+#endif
+
 #define fv0	$f0	 /* return value */
 #define fv0f	$f1
 #define fv1	$f2
diff --git a/libcpu/mips/common/ptrace.h b/libcpu/mips/common/ptrace.h
index cae57cbf4c..c048959053 100644
--- a/libcpu/mips/common/ptrace.h
+++ b/libcpu/mips/common/ptrace.h
@@ -14,6 +14,8 @@
 #include "asm.h"
 #include "mips_regs.h"
 
+#define HI_LO_SIZE  4
+
 #define FP_REG_SIZE 8
 #define NUM_FPU_REGS 16
 
@@ -27,6 +29,7 @@ struct mips_fpu_struct {
 };
 
 struct pt_regs {
+#ifndef ARCH_MIPS64
     /* Only O32 Need This! */
     /* Pad bytes for argument save space on the stack. */
     rt_uint32_t pad0[8];
@@ -41,6 +44,18 @@ struct pt_regs {
     rt_uint32_t cp0_badvaddr;
     rt_uint32_t cp0_cause;
     rt_uint32_t cp0_epc;
+#else
+    /* Saved main processor registers. */
+    unsigned long regs[32];
+
+    /* Saved special registers. */
+    rt_uint32_t cp0_status;
+    rt_uint32_t hi;
+    rt_uint32_t lo;
+    unsigned long cp0_badvaddr;
+    rt_uint32_t cp0_cause;
+    unsigned long cp0_epc;
+#endif
 
 #ifdef RT_USING_FPU
     /* FPU Registers */
@@ -52,7 +67,7 @@ struct pt_regs {
 #endif
 
 /* Note: For call stack o32 ABI has 0x8 shadowsoace Here  */
-#define PT_R0		(0x8 * LONGSIZE)	/* 0 */
+#define PT_R0		(0x0 * LONGSIZE)	/* 0 */
 #define PT_R1		((PT_R0) + LONGSIZE)	/* 1 */
 #define PT_R2		((PT_R1) + LONGSIZE)	/* 2 */
 #define PT_R3		((PT_R2) + LONGSIZE)	/* 3 */
@@ -89,8 +104,8 @@ struct pt_regs {
  * Saved special registers
  */
 #define PT_STATUS	((PT_R31) + LONGSIZE)	/* 32 */
-#define PT_HI		((PT_STATUS) + LONGSIZE)	/* 33 */
-#define PT_LO		((PT_HI) + LONGSIZE)	/* 34 */
+#define PT_HI		((PT_STATUS) + HI_LO_SIZE)	/* 33 */
+#define PT_LO		((PT_HI) + HI_LO_SIZE)	/* 34 */
 #define PT_BADVADDR	((PT_LO) + LONGSIZE)	/* 35 */
 #define PT_CAUSE	((PT_BADVADDR) + LONGSIZE)	/* 36 */
 #define PT_EPC		((PT_CAUSE) + LONGSIZE)	/* 37 */
@@ -115,9 +130,9 @@ struct pt_regs {
 #define PT_FPU_R28              ((PT_FPU_R26) + FP_REG_SIZE)
 #define PT_FPU_R30              ((PT_FPU_R28) + FP_REG_SIZE)
 #define PT_FPU_FCSR31           ((PT_FPU_R30) + FP_REG_SIZE)
-#define PT_FPU_PAD0             ((PT_FPU_FCSR31) + LONGSIZE)
+#define PT_FPU_PAD0             ((PT_FPU_FCSR31) + 4)
 
-#define PT_FPU_END     	        ((PT_FPU_PAD0) + LONGSIZE)
+#define PT_FPU_END     	        ((PT_FPU_PAD0) + 4)
 #define PT_SIZE			PT_FPU_END
 #else
 #define PT_SIZE			PT_REG_END
diff --git a/libcpu/mips/common/stack.c b/libcpu/mips/common/stack.c
index b0e613c7a7..b933b184e7 100644
--- a/libcpu/mips/common/stack.c
+++ b/libcpu/mips/common/stack.c
@@ -16,8 +16,8 @@ register rt_uint32_t $GP __asm__ ("$28");
 
 rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_addr, void *texit)
 {
-    static rt_uint32_t wSR=0;
-    static rt_uint32_t wGP;
+    static rt_ubase_t wSR=0;
+    static rt_ubase_t wGP;
     rt_uint8_t *stk;
 
     struct pt_regs *pt;
@@ -25,26 +25,27 @@ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_ad
     rt_uint32_t i;
 
     /* Get stack aligned */
-    stk = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8);
+    stk = (rt_uint8_t *)RT_ALIGN_DOWN((rt_ubase_t)stack_addr, 8);
     stk -= sizeof(struct pt_regs);
     pt =  (struct pt_regs*)stk;
 
+#ifndef ARCH_MIPS64
     for (i = 0; i < 8; ++i)
     {
         pt->pad0[i] = 0xdeadbeef;
     }
-
+#endif
     /* Fill Stack register numbers */
     for (i = 0; i < 32; ++i)
     {
         pt->regs[i] = 0xdeadbeef;
     }
 
-    pt->regs[REG_SP] = (rt_uint32_t)stk;
-    pt->regs[REG_A0] = (rt_uint32_t)parameter;
-    pt->regs[REG_GP] = (rt_uint32_t)$GP;
-    pt->regs[REG_FP] = (rt_uint32_t)0x0;
-    pt->regs[REG_RA] = (rt_uint32_t)texit;
+    pt->regs[REG_SP] = (rt_ubase_t)stk;
+    pt->regs[REG_A0] = (rt_ubase_t)parameter;
+    pt->regs[REG_GP] = (rt_ubase_t)$GP;
+    pt->regs[REG_FP] = (rt_ubase_t)0x0;
+    pt->regs[REG_RA] = (rt_ubase_t)texit;
 
     pt->hi	= 0x0;
     pt->lo	= 0x0;
@@ -53,7 +54,7 @@ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_ad
     pt->cp0_status |= (ST0_CU1 | ST0_FR);
 #endif
     pt->cp0_cause	= read_c0_cause();
-    pt->cp0_epc	= (rt_uint32_t)tentry;
+    pt->cp0_epc	= (rt_ubase_t)tentry;
     pt->cp0_badvaddr	= 0x0;
 
     return stk;
diff --git a/libcpu/mips/common/stackframe.h b/libcpu/mips/common/stackframe.h
index 77d55f6934..b5a038d1f6 100644
--- a/libcpu/mips/common/stackframe.h
+++ b/libcpu/mips/common/stackframe.h
@@ -159,11 +159,11 @@
     .endm
 
     .macro	RESTORE_TEMP
-    LONG_L	$24, PT_LO(sp)
+    lw	$24, PT_LO(sp)
     LONG_L	$8, PT_R8(sp)
     LONG_L	$9, PT_R9(sp)
     mtlo	$24
-    LONG_L	$24, PT_HI(sp)
+    lw	$24, PT_HI(sp)
     LONG_L	$10, PT_R10(sp)
     LONG_L	$11, PT_R11(sp)
     mthi	$24