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Cap altmbr at 439 bytes, so that the partition select byte is not part
of the file. This means that:
a) updating the altmbr doesn't clobber the configuration;
b) it is easier to simply concatenate the select byte to the file.
This also matches gptmbr behavior.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Fix CBIOS in isohybrid mode. Also allow an isohybrid image to be
booted from a partition. Unfortunately this breaks compatibility
between differing versions of isohybrid and isolinux.bin.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Produce MBR variants with normal (DL) behavior, force to drive 80
behavior, and force to 80 on Ctrl pressed behavior.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Impact: new feature
Create an alternative MBR which takes a partition number in byte 439
instead of looking at the active flag. This is useful when
dual-booting legacy operating systems which assume that their
particular partition must be the active partition.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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New MBR which supports logical partitions. Move the MBR to a subdirectory,
and convert it to gas with the expectation of including it in util-linux.
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