Hi,
attached is a small fix for getroot.c to make the conversion between partition 
names and drive names work correctly on OpenBSD.
After applying this and previous patch, I am able to build GRUB2 both on 
5.3/amd64 and 5.3/i386 and invoke grub-install, and the GRUB2 gets installed 
in the MBR and then able to load the L4 kernel + tons of modules from FAT32 
filesystem (using multiboot).

Thanks!

diff --git a/contrib/grub2/util/getroot.c b/contrib/grub2/util/getroot.c
index 103a3d2..2dd8486 100644
--- a/contrib/grub2/util/getroot.c
+++ b/contrib/grub2/util/getroot.c
@@ -913,7 +913,7 @@ grub_find_device (const char *dir, dev_t dev)
          /* Found!  */
          char *res;
          char *cwd;
-#if defined(__NetBSD__)
+#if defined(__NetBSD__) || defined(__OpenBSD__)
          /* Convert this block device to its character (raw) device.  */
          const char *template = "%s/r%s";
 #else
@@ -2360,7 +2360,7 @@ grub_util_biosdisk_get_grub_dev (const char *os_dev)
     }
   free (sys_disk);
 
-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || 
defined(__APPLE__) || defined(__NetBSD__) || defined (__s
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || 
defined(__APPLE__) || defined(__NetBSD__) || defined (__s
   if (! S_ISCHR (st.st_mode))
 #else
   if (! S_ISBLK (st.st_mode))

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