diff --git a/base/scripts/mount.tb b/base/scripts/mount.tb
index 4a95daf..e079ce8 100644
--- a/base/scripts/mount.tb
+++ b/base/scripts/mount.tb
@@ -1 +1,2 @@
 print 'Mounting filesystems...\n'
+$fs mount -mp system -fs LittleFS -dev atasd-mst -fmt no
diff --git a/scripts/mkbaseimg.sh b/scripts/mkbaseimg.sh
index 08ec5d1..f4c270c 100755
--- a/scripts/mkbaseimg.sh
+++ b/scripts/mkbaseimg.sh
@@ -2,4 +2,4 @@
 
 rm -f base.img
 cat user/FILES.txt | while read line; do cp -v $line base/bin; done
-mklittlefs -c base -b 4096 -s $((1<<20)) base.img
+mklittlefs -c base -b 512 -s $((1<<20)) base.img
diff --git a/ulib/system/system.c b/ulib/system/system.c
index b954d67..afbcae3 100644
--- a/ulib/system/system.c
+++ b/ulib/system/system.c
@@ -43,3 +43,11 @@ int32_t devctl(Dev_t *devh, uint64_t cmd, uint8_t *buffer, size_t len, uint64_t
 int32_t rand(void) {
   return syscall(SYS_RAND, 0, 0, 0, 0, 0, 0);
 }
+
+int32_t vfsmount(char *mountpoint, char *fstype, Dev_t *dev, bool format) {
+  return syscall(SYS_VFSMOUNT, (uint64_t)mountpoint, (uint64_t)fstype, (uint64_t)dev, (uint64_t)format, 0, 0);
+}
+
+int32_t vfsunmount(char *mountpoint) {
+  return syscall(SYS_VFSUNMOUNT, (uint64_t)mountpoint, 0, 0, 0, 0, 0);
+}
diff --git a/ulib/system/system.h b/ulib/system/system.h
index 1d7a611..7be2d3f 100644
--- a/ulib/system/system.h
+++ b/ulib/system/system.h
@@ -3,6 +3,7 @@
 
 #include <stdint.h>
 #include <stddef.h>
+#include <stdbool.h>
 #include <sysdefs/devctl.h>
 
 void debugprint(const char *string);
@@ -14,5 +15,7 @@ int32_t mman_unmap(uint8_t *addr);
 int32_t schedrelease(void);
 int32_t devctl(Dev_t *devh, uint64_t cmd, uint8_t *buffer, size_t len, uint64_t extra);
 int32_t rand(void);
+int32_t vfsmount(char *mountpoint, char *fstype, Dev_t *dev, bool format);
+int32_t vfsunmount(char *mountpoint);
 
 #endif // ULIB_SYSTEM_SYSTEM_H_
diff --git a/user/fs/main.c b/user/fs/main.c
index 07f3539..c3183ae 100644
--- a/user/fs/main.c
+++ b/user/fs/main.c
@@ -2,9 +2,9 @@
 #include <stddef.h>
 #include <ulib.h>
 
-#define CMDS(X)                 \
-  X(fetch)    X(mkf)    X(mkd)  \
-  X(tree)
+#define CMDS(X)                     \
+  X(fetch)    X(mkf)    X(mkd)      \
+  X(tree)     X(mount)
 
 void main(void) {
   if (argslen() == 0) {
diff --git a/user/fs/mkf.c b/user/fs/mkf.c
index 28780ce..15d33cc 100644
--- a/user/fs/mkf.c
+++ b/user/fs/mkf.c
@@ -27,6 +27,10 @@ void fs_mkf(void) {
   }
 
   IOH ioh = ioctl(IOCTL_NOHANDLE, IOCTL_OPENF, (uint64_t)path, IOCTL_F_MAKE | IOCTL_F_WRITE, 0);
+  if (ioh < 0) {
+    uprintf("fs mkf: could not create %s\n", path);
+    return;
+  }
   if (FS_MKF_CONFIG.write != NULL) {
     if (ioctl(ioh, IOCTL_WRITE, (uint64_t)FS_MKF_CONFIG.write, string_len(FS_MKF_CONFIG.write), 0) < 0) {
       uprintf("fs mkf: could not write to %s\n", path);
diff --git a/user/fs/mount.c b/user/fs/mount.c
new file mode 100644
index 0000000..778b5b6
--- /dev/null
+++ b/user/fs/mount.c
@@ -0,0 +1,56 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <ulib.h>
+
+struct {
+  char *mountpoint;
+  char *fstype;
+  char *devname;
+  bool format;
+} FS_MOUNT_CONFIG = {0};
+
+static Arg ARGS[] = {
+  ARG("-mp", ARG_STRING, &FS_MOUNT_CONFIG.mountpoint),
+  ARG("-fs", ARG_STRING, &FS_MOUNT_CONFIG.fstype),
+  ARG("-dev", ARG_STRING, &FS_MOUNT_CONFIG.devname),
+  ARG("-fmt", ARG_BOOL, &FS_MOUNT_CONFIG.format),
+  ARG_END(),
+};
+
+void fs_mount(void) {
+  int32_t ret;
+  if ((ret = parse_args(args()+1, argslen()-1, ARGS)) < 0) {
+    uprintf("fs: could not parse args: %d\n", ret);
+    return;
+  }
+
+  if (FS_MOUNT_CONFIG.mountpoint == NULL) {
+    uprintf("fs: mountpoint missing\n");
+    return;
+  }
+  
+  if (FS_MOUNT_CONFIG.fstype == NULL) {
+    uprintf("fs: filesystem type missing\n");
+    return;
+  }
+  
+  if (FS_MOUNT_CONFIG.devname == NULL) {
+    uprintf("fs: device name missing\n");
+    return;
+  }
+
+  Dev_t dev;
+  ret = devctl(&dev, DEVCTL_GET_HANDLE, (uint8_t *)FS_MOUNT_CONFIG.devname, 0, 0);
+  if (ret != E_OK) {
+    uprintf("fs: device %s not found\n", FS_MOUNT_CONFIG.devname);
+    return;
+  }
+
+  ret = vfsmount(FS_MOUNT_CONFIG.mountpoint, FS_MOUNT_CONFIG.fstype, &dev, FS_MOUNT_CONFIG.format);
+  if (ret != E_OK) {
+    uprintf("fs: mount error %s\n", ERRSTRING(ret));
+    return;
+  } else {
+    uprintf("OK %s\n", FS_MOUNT_CONFIG.mountpoint);
+  }
+}