diff --git a/grub-core/kern/ieee1275/ieee1275.c b/grub-core/kern/ieee1275/ieee1275.c
index cd2dead83..86f81a3c4 100644
--- a/grub-core/kern/ieee1275/ieee1275.c
+++ b/grub-core/kern/ieee1275/ieee1275.c
@@ -784,3 +784,26 @@ grub_ieee1275_no_data_command (grub_ieee1275_ihandle_t ihandle,
 
   return args.catch_result;
 }
+
+int
+grub_ieee1275_get_block_size (grub_ieee1275_ihandle_t ihandle)
+{
+  struct size_args_ieee1275
+    {
+      struct grub_ieee1275_common_hdr common;
+      grub_ieee1275_cell_t method;
+      grub_ieee1275_cell_t ihandle;
+      grub_ieee1275_cell_t result;
+      grub_ieee1275_cell_t size;
+    } args;
+
+  INIT_IEEE1275_COMMON (&args.common, "call-method", 2, 2);
+  args.method = (grub_ieee1275_cell_t) "block-size";
+  args.ihandle = ihandle;
+  args.result = 1;
+
+  if ((IEEE1275_CALL_ENTRY_FN (&args) == -1) || (args.result))
+    return 0;
+
+  return args.size;
+}
diff --git a/include/grub/ieee1275/ieee1275.h b/include/grub/ieee1275/ieee1275.h
index 6dfb57b8b..d0dc2746e 100644
--- a/include/grub/ieee1275/ieee1275.h
+++ b/include/grub/ieee1275/ieee1275.h
@@ -228,6 +228,7 @@ char *EXPORT_FUNC(grub_ieee1275_encode_uint4) (grub_ieee1275_ihandle_t ihandle,
                                              grub_uint32_t lun_lo,
                                              grub_uint32_t lun_hi,
                                              grub_size_t *size);
+int EXPORT_FUNC(grub_ieee1275_get_block_size) (grub_ieee1275_ihandle_t ihandle);
 
 grub_err_t EXPORT_FUNC(grub_claimmap) (grub_addr_t addr, grub_size_t size);