commit 3c72765ec760a51f0e879dc792be82c93141e318
Author: Anatol Pomozov <anatol.pomozov@gmail.com>
Date:   Tue Jun 6 20:07:03 2017 -0700

    Remove restriction that prevents bootimg elf64 images
    
    It is possible to create a 64 bit elf image that has valid multiboot header.
    qemu should be able to boot such images.
    
    Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>

diff --git a/hw/i386/multiboot.c b/hw/i386/multiboot.c
index 663f35a658..cf1b4f5fb3 100644
--- a/hw/i386/multiboot.c
+++ b/hw/i386/multiboot.c
@@ -192,11 +192,6 @@ int load_multiboot(FWCfgState *fw_cfg,
         int kernel_size;
         fclose(f);
 
-        if (((struct elf64_hdr*)header)->e_machine == EM_X86_64) {
-            fprintf(stderr, "Cannot load x86-64 image, give a 32bit one.\n");
-            exit(1);
-        }
-
         kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
                                &elf_low, &elf_high, 0, I386_ELF_MACHINE,
                                0, 0);