[syslinux:master] diag/geodsp: README fixes

[syslinux-bot for Gene Cumm]

Commit-ID:  a5fef9bb39d2712e17a9e77644a55bfa6ccdc6c9
Gitweb:     http://www.syslinux.org/commit/a5fef9bb39d2712e17a9e77644a55bfa6ccdc6c9
Author:     Gene Cumm <gene.cumm at gmail.com>
AuthorDate: Sun, 8 Sep 2013 23:22:22 -0400
Committer:  Gene Cumm <gene.cumm at gmail.com>
CommitDate: Wed, 8 Jan 2014 20:39:41 -0500

diag/geodsp: README fixes

Should clarify the situation; also word-wrap & save example

Signed-off-by: Gene Cumm <gene.cumm at gmail.com>

---
 diag/geodsp/README | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/diag/geodsp/README b/diag/geodsp/README
index 55e0843..9129b69 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