diff --git a/Ubiquitous/XiZi_AIoT/services/app/shell_port.c b/Ubiquitous/XiZi_AIoT/services/app/shell_port.c
index 69164a88f..7f9c286c4 100644
--- a/Ubiquitous/XiZi_AIoT/services/app/shell_port.c
+++ b/Ubiquitous/XiZi_AIoT/services/app/shell_port.c
@@ -49,7 +49,6 @@ 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 409ce5f13..716d81cc1 100644
--- a/Ubiquitous/XiZi_AIoT/services/boards/jh7110/libserial.c
+++ b/Ubiquitous/XiZi_AIoT/services/boards/jh7110/libserial.c
@@ -216,12 +216,12 @@ static inline int serial_in_shift(void* addr, int shift)
 
 bool init_uart_mmio()
 {
-    static int mapped = 0xff;
-    if (mapped != 0) {
+    static int mapped = 0;
+    if (mapped == 0) {
         if (-1 == mmap(UART_ADDR, UART_ADDR, 4096, true)) {
             return false;
         }
-        mapped = 0;
+        mapped = 1;
     }
     return true;
 }
diff --git a/Ubiquitous/XiZi_AIoT/services/shell/letter-shell/shell.c b/Ubiquitous/XiZi_AIoT/services/shell/letter-shell/shell.c
index ec1ff011b..34b99616e 100644
--- a/Ubiquitous/XiZi_AIoT/services/shell/letter-shell/shell.c
+++ b/Ubiquitous/XiZi_AIoT/services/shell/letter-shell/shell.c
@@ -203,7 +203,6 @@ 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);
 }
 
@@ -323,11 +322,9 @@ 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]);