diff --git a/README.md b/README.md
index b943d0c..2b61a31 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
 ## grblHAL ##
 
-Latest build date is 20241208, see the [changelog](changelog.md) for details.  
+Latest build date is 20241219, see the [changelog](changelog.md) for details.  
 
 > [!NOTE]
->  A settings reset will be performed on an update of builds prior to 20241217. Backup and restore of settings is recommended.  
+>  A settings reset will be performed on an update of builds prior to 20241208. Backup and restore of settings is recommended.  
 
 > [!NOTE]
 >  Build 20240222 has moved the probe input to the ioPorts pool of inputs and will be allocated from it when configured.
@@ -93,4 +93,4 @@ G/M-codes not supported by [legacy Grbl](https://github.com/gnea/grbl/wiki) are
 Some [plugins](https://github.com/grblHAL/plugins) implements additional M-codes.
 
 ---
-20241217
+20241219
diff --git a/changelog.md b/changelog.md
index 3c43501..d626aaa 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,26 @@
 ## grblHAL changelog
 
+<a name="20241219">Build 20241219
+
+Core:
+
+* Added directory \(mounts\) listing capabilities to the default root file system when no real root file system \(SD card\) is mounted.
+
+Boards:
+
+* ESP32, iMXRT1062, RP2040: added option to mount littlefs as root filesystem when SD card is not enabled.  
+Ref. RP2040 issue [#103](https://github.com/grblHAL/RP2040/issues/103).
+
+* STM32F3xx: added serial port to `$pins` report.
+
+Plugins:
+
+* WebUI, Networking and SD card: updated to handle littlefs mounted as root filesystem.
+
+---
+
+## grblHAL changelog
+
 <a name="20241217">Build 20241217
 
 Core:
diff --git a/driver_opts.h b/driver_opts.h
index a724b23..6ae061c 100644
--- a/driver_opts.h
+++ b/driver_opts.h
@@ -531,7 +531,7 @@
 #endif
 #ifndef FTP_ENABLE
 #define FTP_ENABLE          0
-#elif !SDCARD_ENABLE
+#elif !(SDCARD_ENABLE || LITTLEFS_ENABLE)
 #undef FTP_ENABLE
 #define FTP_ENABLE          0
 #endif
@@ -648,6 +648,19 @@
 #define SDCARD_ENABLE       0
 #endif
 
+#if LITTLEFS_ENABLE == 2 && SDCARD_ENABLE
+#undef LITTLEFS_ENABLE
+#define LITTLEFS_ENABLE     1
+#endif
+
+#if LITTLEFS_ENABLE
+#if LITTLEFS_ENABLE == 2
+#define LITTLEFS_MOUNT_DIR "/"
+#else
+#define LITTLEFS_MOUNT_DIR "/littlefs"
+#endif
+#endif
+
 #ifndef SPI_ENABLE
 #if SDCARD_ENABLE || TRINAMIC_SPI_ENABLE
 #define SPI_ENABLE 1
diff --git a/grbl.h b/grbl.h
index dfb2cf2..91f55e8 100644
--- a/grbl.h
+++ b/grbl.h
@@ -42,7 +42,7 @@
 #else
 #define GRBL_VERSION "1.1f"
 #endif
-#define GRBL_BUILD 20241217
+#define GRBL_BUILD 20241219
 
 #define GRBL_URL "https://github.com/grblHAL"
 
diff --git a/ngc_flowctrl.c b/ngc_flowctrl.c
index 12abdf0..a7e8985 100644
--- a/ngc_flowctrl.c
+++ b/ngc_flowctrl.c
@@ -669,7 +669,7 @@ status_code_t ngc_flowctrl (uint32_t o_label, char *line, uint_fast8_t *pos, boo
                         if((subname = ngc_string_param_get((ngc_string_id_t)o_label))) {
                             char filename[60];
                             vfs_file_t *file;
-#if LITTLEFS_ENABLE
+#if LITTLEFS_ENABLE == 1
                             sprintf(filename, "/littlefs/%s.macro", subname);
 
                             if((file = stream_redirect_read(filename, onNamedSubError, onNamedSubEOF)) == NULL) {
diff --git a/stream_file.c b/stream_file.c
index e1eb9bd..391fa39 100644
--- a/stream_file.c
+++ b/stream_file.c
@@ -62,7 +62,7 @@ static int16_t stream_read_file (void)
             return ASCII_LF;    // Return a linefeed if the last character was not a linefeed.
         }
     } else
-        c = SERIAL_NO_DATA; // TODO: close all streams?
+        return SERIAL_NO_DATA; // TODO: close all streams?
 
     return (int16_t)c;
 }
@@ -120,6 +120,11 @@ static void onReportHandlersInit (void)
     grbl.report.status_message = trap_status_messages;
 }
 
+bool stream_is_file (void)
+{
+    return hal.stream.type == StreamType_File;
+}
+
 vfs_file_t *stream_redirect_read (char *filename, status_message_ptr status_handler, on_file_end_ptr eof_handler)
 {
     static bool error_handler_ok = false;
diff --git a/stream_file.h b/stream_file.h
index 9776d5b..11d04ec 100644
--- a/stream_file.h
+++ b/stream_file.h
@@ -24,5 +24,6 @@
 #include "vfs.h"
 #include "core_handlers.h"
 
+bool stream_is_file (void);
 void stream_redirect_close (vfs_file_t *file);
 vfs_file_t *stream_redirect_read (char *filename, status_message_ptr status_handler, on_file_end_ptr eof_handler);
diff --git a/vfs.c b/vfs.c
index a55754c..dd8fe87 100644
--- a/vfs.c
+++ b/vfs.c
@@ -31,6 +31,28 @@
 #undef feof
 #endif
 
+static vfs_mount_t *get_rootfs (void);
+
+static inline vfs_mount_t *path_is_mount_dir (const char *path)
+{
+    size_t plen = strlen(path);
+
+    vfs_mount_t *mount = get_rootfs();
+
+    if(*path == '/' && plen == 1)
+        return mount;
+
+    size_t mlen;
+
+    if((mount = mount->next)) do {
+        mlen = strlen(mount->path) - 1;
+        if(mlen == plen && !strncmp(mount->path, path, mlen))
+            break;
+    } while((mount = mount->next));
+
+    return mount;
+}
+
 // NULL file system
 
 static vfs_file_t *fs_open (const char *filename, const char *mode)
@@ -79,7 +101,38 @@ static int fs_dirop (const char *path)
 
 static vfs_dir_t *fs_opendir (const char *path)
 {
-    return NULL;
+    static vfs_dir_t *dir = NULL;
+
+    if(dir == NULL)
+        dir = calloc(sizeof(vfs_dir_t) + 3, 1);
+
+    if(dir) {
+        vfs_mount_t **mount = (vfs_mount_t **)&dir->handle;
+        *mount = get_rootfs()->next;
+    }
+
+    return !strcmp(path, "/") ? dir : NULL;
+}
+
+static char *fs_readdir (vfs_dir_t *dir, vfs_dirent_t *dirent)
+{
+    vfs_mount_t **mount = (vfs_mount_t **)&dir->handle;
+
+    vfs_errno = 0;
+
+    if(*mount) {
+        strcpy(dirent->name, (*mount)->path);
+        *(strchr(dirent->name, '\0') - 1) = '\0';
+        dirent->st_mode = (*mount)->mode;
+        dirent->st_mode.directory = true;
+        while((*mount = (*mount)->next)) {
+            if(!(*mount)->mode.hidden)
+                break;
+        }
+    } else
+        *dirent->name = '\0';
+
+    return *dirent->name ? dirent->name : NULL;
 }
 
 static void fs_closedir (vfs_dir_t *dir)
@@ -88,6 +141,22 @@ static void fs_closedir (vfs_dir_t *dir)
 
 static int fs_stat (const char *filename, vfs_stat_t *st)
 {
+    char path[64];
+    vfs_mount_t *mount;
+
+    if((mount = path_is_mount_dir(strcat(strcpy(path, "/"), filename)))) {
+
+        st->st_size = 1024;
+        st->st_mode = mount->mode;
+        st->st_mode.directory = true;
+#if ESP_PLATFORM
+        st->st_mtim = (time_t)0;
+#else
+        st->st_mtime = (time_t)0;
+#endif
+        return 0;
+    }
+
     return -1;
 }
 
@@ -114,6 +183,7 @@ static const vfs_t fs_null = {
     .fchdir = fs_chdir,
     .frmdir = fs_dirop,
     .fopendir = fs_opendir,
+    .readdir = fs_readdir,
     .fclosedir = fs_closedir,
     .fstat = fs_stat,
     .fgetcwd = fs_getcwd
@@ -133,6 +203,11 @@ static char cwd[100] = "/";
 int vfs_errno = 0;
 vfs_events_t vfs = {0};
 
+static vfs_mount_t *get_rootfs (void)
+{
+    return &root;    
+}
+
 // Strip trailing directory separator, FatFS dont't like it (WinSCP adds it)
 char *vfs_fixpath (char *path)
 {
@@ -143,25 +218,6 @@ char *vfs_fixpath (char *path)
     return path;
 }
 
-static inline vfs_mount_t *path_is_mount_dir (const char *path)
-{
-    size_t plen = strlen(path);
-
-    if(*path == '/' && plen == 1)
-        return &root;
-
-    size_t mlen;
-    vfs_mount_t *mount = root.next;
-
-    if(mount) do {
-        mlen = strlen(mount->path) - 1;
-        if(mlen == plen && !strncmp(mount->path, path, mlen))
-            break;
-    } while((mount = mount->next));
-
-    return mount;
-}
-
 static vfs_mount_t *get_mount (const char *path)
 {
     vfs_errno = 0;
@@ -324,7 +380,7 @@ int vfs_chdir (const char *path)
 
     vfs_errno = 0;
 
-    if(*path != '/') {
+    if(*path != '/' && strcmp(cwd, "/")) {
         if(strcmp(path, "..")) {
             if(strlen(cwd) > 1)
                 strcat(cwd, "/");
@@ -336,24 +392,24 @@ int vfs_chdir (const char *path)
         }
     } else {
 
-        strcpy(cwd, path);
+        if(*path == '/')
+            strcpy(cwd, path);
+        else
+            strcat(strcpy(cwd, "/"), path);
 
-        if((cwdmount = get_mount(path)) && strchr(path + 1, '/') == NULL && cwdmount != &root) {
+        vfs_fixpath(cwd);
+
+        if((cwdmount = get_mount(cwd)) && strchr(cwd + 1, '/') == NULL && cwdmount != &root) {
 
             strcpy(cwd, cwdmount->path);
-            char *s;
-            if((s = strrchr(cwd, '/')))
-                *s = '\0';
+            vfs_fixpath(cwd);
 
             return 0;
         }
     }
 
-    if((ret = cwdmount ? cwdmount->vfs->fchdir(path) : -1) != 0) { // + strlen(mount->path));))
-        char *s = strrchr(cwd, '/');
-        if(s)
-            *s = '\0';
-    }
+    if((ret = cwdmount ? cwdmount->vfs->fchdir(path) : -1) != 0) // + strlen(mount->path));))
+        vfs_fixpath(cwd);
 
     return ret;
 }