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Option -no-fd-bootchk asks the BIOS to attempt booting from a floppy even when the boot sector signature isn't there, by setting a bit in RTC CMOS. It was added back in 2006 (commit 52ca8d6a). Two years later, commit 0ecdffbb added monitor command boot_set. Implemented by new function pc_boot_set(). It unconditionally clears the floppy signature bit in CMOS. Commit e0f084bf added -boot option once to automatically change the boot order on first reset. Reuses pc_boot_set(), thus also clears the floppy signature bit. Commit d9346e81 took care to preserve this behavior. Thus, -no-fd-bootchk applies to any number of boots. Except it applies just to the first boot with -boot once, and never after boot_set. Weird. Make it stick instead: set the bit according to -no-fd-bootchk in pc_boot_set(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Anthony Liguori <aliguori@us.ibm.com> Message-id: 1371208516-7857-6-git-send-email-armbru@redhat.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>