diff --git a/Ubiquitous/XiZi_AIoT/services/app/shell_port.c b/Ubiquitous/XiZi_AIoT/services/app/shell_port.c
index 7f9c286c4..69164a88f 100644
--- a/Ubiquitous/XiZi_AIoT/services/app/shell_port.c
+++ b/Ubiquitous/XiZi_AIoT/services/app/shell_port.c
@@ -49,6 +49,7 @@ int main(void)
     shell.read = userShellRead;
 
     shellInit(&shell, shellBuffer, 512);
+    printf("shell init\n");
 
     while (connect_session(&session_fs, "MemFS", 0x10000) < 0)
         ;
diff --git a/Ubiquitous/XiZi_AIoT/services/boards/jh7110/libserial.c b/Ubiquitous/XiZi_AIoT/services/boards/jh7110/libserial.c
index fcc87026a..409ce5f13 100644
--- a/Ubiquitous/XiZi_AIoT/services/boards/jh7110/libserial.c
+++ b/Ubiquitous/XiZi_AIoT/services/boards/jh7110/libserial.c
@@ -216,19 +216,19 @@ static inline int serial_in_shift(void* addr, int shift)
 
 bool init_uart_mmio()
 {
-    static int mapped = 0;
-    if (mapped == 0) {
+    static int mapped = 0xff;
+    if (mapped != 0) {
         if (-1 == mmap(UART_ADDR, UART_ADDR, 4096, true)) {
             return false;
         }
-        mapped = 1;
+        mapped = 0;
     }
     return true;
 }
 
 void putc(char ch)
 {
-    static struct NS16550* com_port = (struct NS16550*)UART_ADDR;
+    struct NS16550* com_port = (struct NS16550*)UART_ADDR;
 
     if (ch == '\n') {
         putc('\r');
@@ -241,7 +241,7 @@ void putc(char ch)
 
 char getc(void)
 {
-    static struct NS16550* com_port = (struct NS16550*)UART_ADDR;
+    struct NS16550* com_port = (struct NS16550*)UART_ADDR;
 
     while (!(serial_din(&com_port->lsr) & UART_LSR_DR))
         ;
diff --git a/Ubiquitous/XiZi_AIoT/services/shell/letter-shell/shell.c b/Ubiquitous/XiZi_AIoT/services/shell/letter-shell/shell.c
index 34b99616e..ec1ff011b 100644
--- a/Ubiquitous/XiZi_AIoT/services/shell/letter-shell/shell.c
+++ b/Ubiquitous/XiZi_AIoT/services/shell/letter-shell/shell.c
@@ -203,6 +203,7 @@ void shellInit(Shell* shell, char* buffer, unsigned short size)
     shellAdd(shell);
 
     shellSetUser(shell, shellSeekCommand(shell, SHELL_DEFAULT_USER, shell->commandList.base, 0));
+
     shellWritePrompt(shell, 1);
 }
 
@@ -322,9 +323,11 @@ static void shellWritePrompt(Shell* shell, unsigned char newline)
         if (newline) {
             shellWriteString(shell, "\r\n");
         }
+#ifndef __riscv
         shellWriteString(shell, shell->info.user->data.user.name);
         shellWriteString(shell, ":");
         shellWriteString(shell, shell->info.path ? shell->info.path : "/");
+#endif
         shellWriteString(shell, "$ ");
     } else {
         shellWriteString(shell, shellText[SHELL_TEXT_PASSWORD_HINT]);