diff --git a/include/filesys/block/sdmm_vfs.c b/include/filesys/block/sdmm_vfs.c
new file mode 100644
index 000000000..5e7708fb4
--- /dev/null
+++ b/include/filesys/block/sdmm_vfs.c
@@ -0,0 +1,83 @@
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/vfs.h>
+#include <dirent.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+vfs_file_t *
+_sdmm_open(int pclk, int pss, int pdi, int pdo)
+{
+    int r;
+    int drv = 0;
+    struct __using("filesys/block/sdmm.cc") *SDMM;
+    unsigned long long pmask;
+    vfs_file_t *handle;
+    
+    SDMM = _gc_alloc_managed(sizeof(*SDMM));
+
+#ifdef _DEBUG
+    __builtin_printf("sdmm_open: using pins: %d %d %d %d\n", pclk, pss, pdi, pdo);
+#endif    
+    pmask = (1ULL << pclk) | (1ULL << pss) | (1ULL << pdi) | (1ULL << pdo);
+    if (!_usepins(pmask)) {
+        _gc_free(SDMM);
+        _seterror(EBUSY);
+        return 0;
+    }
+    SDMM->f_pinmask = pmask;
+    r = SDMM->disk_setpins(drv, pclk, pss, pdi, pdo);
+    if (r == 0)
+        r = SDMM->disk_initialize(0);
+    if (r != 0) {
+#ifdef _DEBUG
+       __builtin_printf("sd card initialize: result=[%d]\n", r);
+       _waitms(1000);
+#endif
+       goto cleanup_and_out;
+    }
+    handle = _get_vfs_file_handle();
+    if (!handle) goto cleanup_and_out;
+
+    handle->flags = O_RDWR;
+    handle->bufmode = _IONBF;
+    handle->state = _VFS_STATE_INUSE | _VFS_STATE_WROK | _VFS_STATE_RDOK;
+    handle->read = &SDMM->v_read;
+    handle->write = &SDMM->v_write;
+    handle->close = &SDMM->v_close;
+    handle->ioctl = &SDMM->v_ioctl;
+    handle->flush = &SDMM->v_flush;
+    handle->lseek = &SDMM->v_lseek;
+    handle->putcf = &SDMM->v_putc;
+    handle->getcf = &SDMM->v_getc;
+    return handle;
+cleanup_and_out:
+    _freepins(pmask);
+    _gc_free(SDMM);
+    _seterror(EIO);
+    return 0;
+}
+
+struct vfs *
+_vfs_open_sdcardx(int pclk, int pss, int pdi, int pdo)
+{
+    vfs_file_t *handle;
+    struct vfs *result;
+    
+    handle = _sdmm_open(pclk, pss, pdi, pdo);
+    if (!handle) return 0;
+    result = _vfs_open_fat_handle(handle);
+    if (!result) {
+        /* go ahead and close the handle */
+        handle->close(handle);
+    }
+    return result;
+}
+
+struct vfs *
+_vfs_open_sdcard()
+{
+    return _vfs_open_sdcardx(61, 60, 59, 58);
+}
+
diff --git a/include/filesys/fatfs/fatfs_vfs.c b/include/filesys/fatfs/fatfs_vfs.c
index ff08c697f..f8f670813 100644
--- a/include/filesys/fatfs/fatfs_vfs.c
+++ b/include/filesys/fatfs/fatfs_vfs.c
@@ -7,80 +7,6 @@
 #include <fcntl.h>
 #include "ff.h"
 
-vfs_file_t *
-_sdmm_open(int pclk, int pss, int pdi, int pdo)
-{
-    int r;
-    int drv = 0;
-    struct __using("filesys/block/sdmm.cc") *SDMM;
-    unsigned long long pmask;
-    vfs_file_t *handle;
-    
-    SDMM = _gc_alloc_managed(sizeof(*SDMM));
-
-#ifdef _DEBUG
-    __builtin_printf("sdmm_open: using pins: %d %d %d %d\n", pclk, pss, pdi, pdo);
-#endif    
-    pmask = (1ULL << pclk) | (1ULL << pss) | (1ULL << pdi) | (1ULL << pdo);
-    if (!_usepins(pmask)) {
-        _gc_free(SDMM);
-        _seterror(EBUSY);
-        return 0;
-    }
-    SDMM->f_pinmask = pmask;
-    r = SDMM->disk_setpins(drv, pclk, pss, pdi, pdo);
-    if (r == 0)
-        r = SDMM->disk_initialize(0);
-    if (r != 0) {
-#ifdef _DEBUG
-       __builtin_printf("sd card initialize: result=[%d]\n", r);
-       _waitms(1000);
-#endif
-       goto cleanup_and_out;
-    }
-    handle = _get_vfs_file_handle();
-    if (!handle) goto cleanup_and_out;
-
-    handle->flags = O_RDWR;
-    handle->bufmode = _IONBF;
-    handle->state = _VFS_STATE_INUSE | _VFS_STATE_WROK | _VFS_STATE_RDOK;
-    handle->read = &SDMM->v_read;
-    handle->write = &SDMM->v_write;
-    handle->close = &SDMM->v_close;
-    handle->ioctl = &SDMM->v_ioctl;
-    handle->flush = &SDMM->v_flush;
-    handle->lseek = &SDMM->v_lseek;
-    handle->putcf = &SDMM->v_putc;
-    handle->getcf = &SDMM->v_getc;
-    return handle;
-cleanup_and_out:
-    _freepins(pmask);
-    _gc_free(SDMM);
-    _seterror(EIO);
-    return 0;
-}
-
-struct vfs *
-_vfs_open_sdcardx(int pclk, int pss, int pdi, int pdo)
-{
-    vfs_file_t *handle;
-    struct vfs *result;
-    
-    handle = _sdmm_open(pclk, pss, pdi, pdo);
-    if (!handle) return 0;
-    result = _vfs_open_fat_handle(handle);
-    if (!result) {
-        /* go ahead and close the handle */
-        handle->close(handle);
-    }
-    return result;
-}
-
-struct vfs *
-_vfs_open_sdcard()
-{
-    return _vfs_open_sdcardx(61, 60, 59, 58);
-}
 
 struct vfs *
 _vfs_open_fat_handle(vfs_file_t *fhandle)
diff --git a/include/libc.a b/include/libc.a
index 7ca9f1a80..53dbad8fb 100644
--- a/include/libc.a
+++ b/include/libc.a
@@ -8,12 +8,14 @@
 #define DIR struct _dir
 #define DIRENT struct dirent
 
+/* filesys/block/sdmm_vfs.c */
+_FILE *_sdmm_open(int pclk, int pss, int pdi, int pdo) __fromfile("filesys/block/sdmm_vfs.c");
+struct vfs *_vfs_open_sdcard(void) __fromfile("filesys/block/sdmm_vfs.c");
+struct vfs *_vfs_open_sdcardx(int pclk, int pss, int pdi, int pdo) __fromfile("filesys/block/sdmm_vfs.c");
+
 /* filesys/fatfs/fatfs_vfs.c */
-_FILE *_sdmm_open(int pclk, int pss, int pdi, int pdo) __fromfile("filesys/fatfs/fatfs_vfs.c");
 struct vfs *_vfs_open_fat_handle(_FILE *fhandle) __fromfile("filesys/fatfs/fatfs_vfs.c");
 struct vfs *_vfs_open_fat_file(const char *name) __fromfile("filesys/fatfs/fatfs_vfs.c");
-struct vfs *_vfs_open_sdcard(void) __fromfile("filesys/fatfs/fatfs_vfs.c");
-struct vfs *_vfs_open_sdcardx(int pclk, int pss, int pdi, int pdo) __fromfile("filesys/fatfs/fatfs_vfs.c");
 
 /* filesys/fs9p/fs9p_vfs.c */
 struct vfs *_vfs_open_host(void) __fromfile("filesys/fs9p/fs9p_vfs.c");
diff --git a/include/sys/vfs.h b/include/sys/vfs.h
index cf6d14613..41c818067 100644
--- a/include/sys/vfs.h
+++ b/include/sys/vfs.h
@@ -56,8 +56,8 @@ struct vfs *_vfs_open_fat_handle(vfs_file_t *handle) _IMPL("filesys/fatfs/fatfs_
 struct vfs *_vfs_open_fat_file(const char *name) _IMPL("filesys/fatfs/fatfs_vfs.c");
 
 /* legacy calls */
-struct vfs *_vfs_open_sdcard(void) _IMPL("filesys/fatfs/fatfs_vfs.c");
-struct vfs *_vfs_open_sdcardx(int pclk = 61, int pss = 60, int pdi = 59, int pdo = 58) _IMPL("filesys/fatfs/fatfs_vfs.c");
+struct vfs *_vfs_open_sdcard(void) _IMPL("filesys/block/sdmm_vfs.c");
+struct vfs *_vfs_open_sdcardx(int pclk = 61, int pss = 60, int pdi = 59, int pdo = 58) _IMPL("filesys/block/sdmm_vfs.c");
 
 /* parallax file system */
 struct vfs *_vfs_open_parallaxfs(void) _IMPL("filesys/parallax/parallaxfs_vfs.c");