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Added a description of SUN Disk Label for SUN SPARC machines.

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This commit is contained in:
Thomas Schmitt 2010-11-01 16:05:47 +01:00
parent 8ad92a08ea
commit ea8da1f7d3
1 changed files with 106 additions and 1 deletions
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105
doc/boot_sectors.txt
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@ -23,6 +23,8 @@ MIPS Volume Header, for MIPS Big Endian, e.g. SGI Indigo2.
DEC Boot Block, for MIPS Little Endian , e.g. DECstation.
SUN Disk Label and boot images, for SUN SPARC
------------------------------------------------------------------------------
@ -648,6 +650,109 @@ Byte Range | Value | Meaning
16 - 19 | p_filesz | /* Segment size in file */
|-> seg_size | Needed for seg_size
| |
---------- | ---------- | ----------------------------------------------------
------------------------------------------------------------------------------
SUN Disk Label and boot images
for SUN SPARC
Sources:
cdrtools-2.01.01a77/mkisofs/sunlabel.h
cdrtools-2.01.01a77/mkisofs/mkisofs.8
by Joerg Schilling
The Disk Label is written to the first 512 bytes of the image. It can mark
8 partitions (slices ) of which the first contains the ISO image. The other
7 may contain boot images.
Words are composed big-endian style.
Boot images are provided externally. mkisofs arranges them after the end of
the ISO image so that each starts at a cylinder boundary (320 kB).
There is a mechanism in mkisofs which fills unused partitions by copies of
their predecessor in the partition table:
"If the special filename ... is used, the actual and all following
boot partitions are mapped to the previous partition.
If mkisofs is called with -G image -B ... all boot partitions are
mapped to the partition that contains the ISO9660 filesystem."
Disk Label components:
Byte Range | Value | Meaning
---------- | ---------- | ----------------------------------------------------
0 - 127 | label | ASCII Label
| | "CD-ROM Disc with Sun sparc boot created by ..."
| | mkisofs option -sparc-label
| |
128 - 263 | ========== | /* vtoc inclusions from AT&T SVr4 */
| |
128 - 131 | 1 | Layout version
132 - 139 | 0 | /* volume name */
140 - 141 | 8 | Number of partitions
| |
142 - 173 | ========== | 8 partition entries of 4 bytes
| |
142 - 145 | ========== | Entry for partition 1
142 - 143 | 4 | ID tag of partition: 4 = User partition
144 - 145 | 0x10 | Permissions: 0x10 = read-only
| |
146 - 149 | ========== | Entry for partition 2
146 - 147 | id_tag2 | ID tag of partition:
| | 0 = unused
| | 2 = Root partition with boot image
148 - 149 | perm2 | Permissions:
| | 0 = unused
| | 0x10 = read-only (if used)
| |
150 - 173 | ========== | Entries for partition 3 to 8.
| | See above: Entry for partition 2
| |
174 - 175 | 0 | Padding
| |
176 - 187 | 0 | /* info for mboot */
| |
188 - 191 | 0x600ddeee | /* to verify vtoc sanity */
| |
192 - 231 | 0 | Reserved
| |
232 - 263 | 0 | 8 Timestamps of yet unknown format
| |
264 - 419 | 0 | Padding
| |
420 - 443 | ========== | Disk properties
| |
420 - 421 | 350 | Rotations per minute
422 - 423 | 2048 | Number of physical cylinders (fixely 640 MB)
424 - 425 | 0 | /* alternates per cylinder */
426 - 429 | 0 | /* obsolete */
430 - 431 | 1 | /* interleave factor */
432 - 433 | 2048 | Number of data cylinders (fixely 640 MB)
434 - 435 | 0 | /* # of alternate cylinders */
436 - 437 | 1 | Number of heads per cylinder (i.e. 1 cyl = 320 kB)
438 - 439 | 640 | Number of sectors per head (i.e. 1 head = 320 kB)
440 - 443 | 0 | /* obsolete */
| |
444 - 507 | ========== | Partition table
| |
444 - 451 | ========== | Partition table entry #1
| |
444 - 447 | start_cyl | Start cylinder
| |
448 - 451 | num_blocks | Number of blocks in partition
| |
452 - 507 | ========== | Partition table entries #2 to #8
| ... | See above Partition table entry #1
| |
508 - 509 | 0xdabe | Magic Number
| |
510 - 511 | checksum | The result of exoring 2-byte words 0 to 254
| |
---------- | ---------- | ----------------------------------------------------
------------------------------------------------------------------------------