30 lines
1.3 KiB
Plaintext
30 lines
1.3 KiB
Plaintext
GeoDsp: Images to display the geometry as the BIOS has choosen to
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interpret it. Both images are intended to be written to the first ~8MiB
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of a raw device (ie /dev/hda, /dev/sda) and be over one large cylinder
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of 255*63 512-byte sectors in size.
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To save the existing data for restore later:
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dd bs=1M iflag=fullblock count=8 if=/dev/sda of=sda.img
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GeoDsp1S is a one-sector variant containing all code in one sector that
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is intended to test behavior with a typical MBR/partition table layout.
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A partition table should be written after writting an image.
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GeoDspMS is a multi sector variant intended to look like Syslinux
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installed on a file system on the raw device (as opposed to a file
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system within a partition).
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GeoDspMS can also be used to attempt to make the boot sector look like a
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normal file system's boot sector (ie FAT12/FAT16/FAT32). In order to do
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this, you must first save a portion the existing boot sector (the
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majority of the BIOS parameter block).
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dd bs=1 skip=3 count=87 if=/dev/sda1 of=sda1.bpb
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dd conv=notrunc if=geodspms.img of=/dev/sda1
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dd conv=notrunc bs=1 seek=3 count=87 if=sda1.bpb of=/dev/sda1
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dd bs=1 skip=3 count=87 if=/dev/fd0 of=fd0.bpb
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dd conv=notrunc if=geodspms.img of=/dev/fd0
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dd conv=notrunc bs=1 seek=3 count=87 if=fd0.bpb of=/dev/fd0
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