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-rw-r--r--diag/mbr/README4
1 files changed, 3 insertions, 1 deletions
diff --git a/diag/mbr/README b/diag/mbr/README
index fb7a7dd8..96b67c6c 100644
--- a/diag/mbr/README
+++ b/diag/mbr/README
@@ -5,11 +5,13 @@ handoff.bin Show the data that the BIOS/MBR hands off to an MBR/VBR.
+++ USAGE +++
+NOTE: in the examples, mbr.bin, /dev/hda and /dev/hda1 are used as generic representations.
+
Writing out an MBR is straight forward (it is assumed below that /dev/hda is the target raw device and /dev/hda1 is the target partition):
dd conv=notrunc bs=440 count=1 if=mbr.bin of=/dev/hda
-Writing a VBR to match Syslinux requires more work as it must have a jump and be offset into the partition:
+Writing a VBR to match Syslinux requires more work as it must have a jump and be offset into the partition (and as a result the code must be compaible with this offset):
echo -en "\0353\0130\0220" |dd conv=notrunc bs=1 count=3 of=/dev/hda1
dd conv=notrunc bs=2 count=210 seek=45 if=mbr.bin of=/dev/hda1