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-rw-r--r--diag/geodsp/README32
1 files changed, 25 insertions, 7 deletions
diff --git a/diag/geodsp/README b/diag/geodsp/README
index 55e08438..9129b694 100644
--- a/diag/geodsp/README
+++ b/diag/geodsp/README
@@ -1,11 +1,29 @@
-GeoDsp: Images to display the geometry as the BIOS has choosen to interpret it. Both images are intended to be written to the first ~8MiB of a raw device (ie /dev/hda, /dev/sda) and be over one large cylinder of 255*63 512-byte sectors in size.
+GeoDsp: Images to display the geometry as the BIOS has choosen to
+interpret it. Both images are intended to be written to the first ~8MiB
+of a raw device (ie /dev/hda, /dev/sda) and be over one large cylinder
+of 255*63 512-byte sectors in size.
-GeoDsp1S is a one-sector variant containing all code in one sector that is intended to test behavior with a typical MBR/partition table layout. A partition table should be written after writting an image.
+To save the existing data for restore later:
-GeoDspMS is a multi sector variant intended to look like Syslinux installed on a file system on the raw device (as opposed to a file system within a partition).
+ dd bs=1M iflag=fullblock count=8 if=/dev/sda of=sda.img
-GeoDspMS can also be used to attempt to make the boot sector look like a normal file system's boot sector (ie FAT12/FAT16/FAT32). In order to do this, you must first save a portion the existing boot sector (the majority of the BIOS parameter block).
- dd bs=1 skip=3 count=87 if=/dev/sda of=sda.bpb
- dd conv=notrunc if=geodspms.img of=/dev/sda
- dd conv=notrunc bs=1 seek=3 count=87 if=sda.bpb of=/dev/sda
+GeoDsp1S is a one-sector variant containing all code in one sector that
+is intended to test behavior with a typical MBR/partition table layout.
+A partition table should be written after writting an image.
+GeoDspMS is a multi sector variant intended to look like Syslinux
+installed on a file system on the raw device (as opposed to a file
+system within a partition).
+
+GeoDspMS can also be used to attempt to make the boot sector look like a
+normal file system's boot sector (ie FAT12/FAT16/FAT32). In order to do
+this, you must first save a portion the existing boot sector (the
+majority of the BIOS parameter block).
+
+ dd bs=1 skip=3 count=87 if=/dev/sda1 of=sda1.bpb
+ dd conv=notrunc if=geodspms.img of=/dev/sda1
+ dd conv=notrunc bs=1 seek=3 count=87 if=sda1.bpb of=/dev/sda1
+
+ dd bs=1 skip=3 count=87 if=/dev/fd0 of=fd0.bpb
+ dd conv=notrunc if=geodspms.img of=/dev/fd0
+ dd conv=notrunc bs=1 seek=3 count=87 if=fd0.bpb of=/dev/fd0