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The printf(3) function has support for the %X format specifier, to output an unsigned hexadecimal integer in uppercase. This can be achived in GRUB using the %x format specifier in grub_printf() and calling grub_toupper(), but it is more convenient if there is support for %X in grub_printf(). Signed-off-by: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>