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| author | Gene Cumm <gene.cumm@gmail.com> | 2013-09-08 23:22:22 -0400 |
|---|---|---|
| committer | Gene Cumm <gene.cumm@gmail.com> | 2014-01-08 20:39:41 -0500 |
| commit | a5fef9bb39d2712e17a9e77644a55bfa6ccdc6c9 (patch) | |
| tree | 718d1bd2ca9844c55bcd634f1cc4d27de6674b5f | |
| parent | a561eb2b62e5f6bfd764738523774e8a69ed3d26 (diff) | |
| download | syslinux-a5fef9bb39d2712e17a9e77644a55bfa6ccdc6c9.tar.gz syslinux-a5fef9bb39d2712e17a9e77644a55bfa6ccdc6c9.tar.xz syslinux-a5fef9bb39d2712e17a9e77644a55bfa6ccdc6c9.zip | |
diag/geodsp: README fixes
Should clarify the situation; also word-wrap & save example
Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
| -rw-r--r-- | diag/geodsp/README | 32 |
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 |