Improve friendliness of misconfigured bootloader error

If a user specifies an improper grub.conf entry for Xen (does not specify a module line or mispells module), Xen outputs the following error:

FATAL ERROR: Require at least one Multiboot module.

The attached patch changes this error to:

FATAL ERROR: dom0 kernel not specified! Check bootloader configuration.

I've had a few people ask for help debugging this problem and usually they have no idea what a multiboot module is so the error is not helpful to them.

Regards,

Anthony Liguori

@@ -262,7 +262,7 @@
     /* Check that we have at least one Multiboot module. */
     if ( !(mbi->flags & MBI_MODULES) || (mbi->mods_count == 0) )
     {
-        printk("FATAL ERROR: Require at least one Multiboot module.\n");
+        printk("FATAL ERROR: dom0 kernel not specified! Check bootloader configuration.\n");
         EARLY_FAIL();
     }
 

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