diff --git a/shell.c b/shell.c
index d9b0d90..e55d040 100644
--- a/shell.c
+++ b/shell.c
@@ -34,6 +34,7 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <errno.h>
 #include "vdisk.h"
 #include "vnet.h"
 #include "umka.h"
@@ -288,6 +289,36 @@ void shell_disk_list_partitions(disk_t *d) {
     }
 }
 
+void shell_ramdisk_init(int argc, char **argv) {
+    const char *usage = \
+        "usage: ramdisk_init <file>\n"
+        "  <file>           absolute or relative path";
+    if (argc != 2) {
+        puts(usage);
+        return;
+    }
+    const char *fname = argv[1];
+    FILE *f = fopen(fname, "r");
+    if (!f) {
+        fprintf(fout, "[!] can't open file '%s': %s\n", fname, strerror(errno));
+        return;
+    }
+    fseek(f, 0, SEEK_END);
+    size_t fsize = ftell(f);
+    if (fsize > 2880*512) {
+        fprintf(fout, "[!] file '%s' is too big, max size is 1474560 bytes\n",
+                fname);
+        return;
+    }
+    rewind(f);
+    fread(kos_ramdisk, fsize, 1, f);
+    fclose(f);
+    COVERAGE_ON();
+    void *ramdisk = kos_ramdisk_init();
+    COVERAGE_OFF();
+    shell_disk_list_partitions(ramdisk);
+}
+
 void shell_disk_add(int argc, char **argv) {
     const char *usage = \
         "usage: disk_add <file> <name> [option]...\n"
@@ -1133,7 +1164,9 @@ void shell_acpi_call(int argc, char **argv) {
     }
     const char *method = argv[1];
     fprintf(fout, "calling acpi method: '%s'\n", method);
+    COVERAGE_ON();
     kos_acpi_call_name(acpi_ctx, method);
+    COVERAGE_OFF();
     fprintf(fout, "acpi method returned\n");
 }
 
@@ -1866,6 +1899,7 @@ typedef struct {
 
 func_table_t funcs[] = {
     { "i40",                     shell_i40 },
+    { "ramdisk_init",            shell_ramdisk_init },
     { "disk_add",                shell_disk_add },
     { "disk_del",                shell_disk_del },
     { "ls70",                    shell_ls70 },
diff --git a/test/016_#f01_#draw_all.ref.log b/test/016_#f01_#draw_all.ref.log
index 025149b..08fac13 100644
--- a/test/016_#f01_#draw_all.ref.log
+++ b/test/016_#f01_#draw_all.ref.log
@@ -1,4 +1,5 @@
-/> disk_add ../img/kolibri.img rd -c 0
+#disk_add ../img/kolibri.img rd -c 0
+/> ramdisk_init ../img/kolibri.img
 /rd/1: fat
 /> set_skin /sys/DEFAULT.SKN
 status: 0
diff --git a/test/016_#f01_#draw_all.t b/test/016_#f01_#draw_all.t
index 908d9e1..5657678 100644
--- a/test/016_#f01_#draw_all.t
+++ b/test/016_#f01_#draw_all.t
@@ -1,4 +1,5 @@
-disk_add ../img/kolibri.img rd -c 0
+#disk_add ../img/kolibri.img rd -c 0
+ramdisk_init ../img/kolibri.img
 set_skin /sys/DEFAULT.SKN
 window_redraw 1
 draw_window 10 300 5 200 0x000088 1 1 1 0 1 4 hello
diff --git a/umka.asm b/umka.asm
index 2415989..c73ccb8 100644
--- a/umka.asm
+++ b/umka.asm
@@ -43,6 +43,7 @@ public WIN_POS as 'kos_win_pos'
 public lfb_base as 'kos_lfb_base'
 
 public RAMDISK as 'kos_ramdisk'
+public ramdisk_init as 'kos_ramdisk_init'
 
 public enable_acpi
 public acpi.call_name
diff --git a/umka.h b/umka.h
index 6b449f5..5dba18f 100644
--- a/umka.h
+++ b/umka.h
@@ -325,7 +325,7 @@ void kos_init(void);
 void i40(void);
 uint32_t kos_time_to_epoch(uint32_t *time);
 
-void *disk_add(diskfunc_t *disk, const char *name, void *userdata, uint32_t flags) __attribute__((__stdcall__));
+disk_t *disk_add(diskfunc_t *disk, const char *name, void *userdata, uint32_t flags) __attribute__((__stdcall__));
 void *disk_media_changed(diskfunc_t *disk, int inserted) __attribute__((__stdcall__));
 void disk_del(disk_t *disk)  __attribute__((__stdcall__));
 
@@ -337,6 +337,7 @@ extern uint8_t fat_user_functions[];
 extern uint8_t ntfs_user_functions[];
 
 extern uint8_t kos_ramdisk[2880*512];
+disk_t *kos_ramdisk_init(void);
 
 static inline void kos_enable_acpi() {
     __asm__ __inline__ __volatile__ (