Added a description of SUN Disk Label for SUN SPARC machines.
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@ -11,7 +11,7 @@ This information is collected from various sources. Some is backed by
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specifications, some is just rumor which happens to work (maybe not even that).
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specifications, some is just rumor which happens to work (maybe not even that).
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Content
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Content
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EL Torito CD booting, for PC-BIOS x86, PowerPC, (old) Mac, EFI.
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EL Torito CD booting, for PC-BIOS x86, PowerPC, (old) Mac, EFI.
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@ -23,6 +23,8 @@ MIPS Volume Header, for MIPS Big Endian, e.g. SGI Indigo2.
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DEC Boot Block, for MIPS Little Endian , e.g. DECstation.
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DEC Boot Block, for MIPS Little Endian , e.g. DECstation.
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SUN Disk Label and boot images, for SUN SPARC
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------------------------------------------------------------------------------
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------------------------------------------------------------------------------
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@ -648,6 +650,109 @@ Byte Range | Value | Meaning
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16 - 19 | p_filesz | /* Segment size in file */
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16 - 19 | p_filesz | /* Segment size in file */
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|-> seg_size | Needed for seg_size
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|-> seg_size | Needed for seg_size
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---------- | ---------- | ----------------------------------------------------
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------------------------------------------------------------------------------
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SUN Disk Label and boot images
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for SUN SPARC
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Sources:
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cdrtools-2.01.01a77/mkisofs/sunlabel.h
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cdrtools-2.01.01a77/mkisofs/mkisofs.8
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by Joerg Schilling
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The Disk Label is written to the first 512 bytes of the image. It can mark
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8 partitions (slices ) of which the first contains the ISO image. The other
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7 may contain boot images.
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Words are composed big-endian style.
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Boot images are provided externally. mkisofs arranges them after the end of
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the ISO image so that each starts at a cylinder boundary (320 kB).
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There is a mechanism in mkisofs which fills unused partitions by copies of
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their predecessor in the partition table:
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"If the special filename ... is used, the actual and all following
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boot partitions are mapped to the previous partition.
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If mkisofs is called with -G image -B ... all boot partitions are
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mapped to the partition that contains the ISO9660 filesystem."
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Disk Label components:
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Byte Range | Value | Meaning
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---------- | ---------- | ----------------------------------------------------
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0 - 127 | label | ASCII Label
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| | "CD-ROM Disc with Sun sparc boot created by ..."
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| | mkisofs option -sparc-label
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128 - 263 | ========== | /* vtoc inclusions from AT&T SVr4 */
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128 - 131 | 1 | Layout version
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132 - 139 | 0 | /* volume name */
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140 - 141 | 8 | Number of partitions
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142 - 173 | ========== | 8 partition entries of 4 bytes
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142 - 145 | ========== | Entry for partition 1
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142 - 143 | 4 | ID tag of partition: 4 = User partition
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144 - 145 | 0x10 | Permissions: 0x10 = read-only
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146 - 149 | ========== | Entry for partition 2
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146 - 147 | id_tag2 | ID tag of partition:
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| | 0 = unused
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| | 2 = Root partition with boot image
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148 - 149 | perm2 | Permissions:
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| | 0 = unused
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| | 0x10 = read-only (if used)
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150 - 173 | ========== | Entries for partition 3 to 8.
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| | See above: Entry for partition 2
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174 - 175 | 0 | Padding
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176 - 187 | 0 | /* info for mboot */
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188 - 191 | 0x600ddeee | /* to verify vtoc sanity */
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192 - 231 | 0 | Reserved
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232 - 263 | 0 | 8 Timestamps of yet unknown format
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264 - 419 | 0 | Padding
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420 - 443 | ========== | Disk properties
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420 - 421 | 350 | Rotations per minute
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422 - 423 | 2048 | Number of physical cylinders (fixely 640 MB)
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424 - 425 | 0 | /* alternates per cylinder */
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426 - 429 | 0 | /* obsolete */
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430 - 431 | 1 | /* interleave factor */
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432 - 433 | 2048 | Number of data cylinders (fixely 640 MB)
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434 - 435 | 0 | /* # of alternate cylinders */
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436 - 437 | 1 | Number of heads per cylinder (i.e. 1 cyl = 320 kB)
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438 - 439 | 640 | Number of sectors per head (i.e. 1 head = 320 kB)
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440 - 443 | 0 | /* obsolete */
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444 - 507 | ========== | Partition table
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444 - 451 | ========== | Partition table entry #1
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444 - 447 | start_cyl | Start cylinder
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448 - 451 | num_blocks | Number of blocks in partition
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452 - 507 | ========== | Partition table entries #2 to #8
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| ... | See above Partition table entry #1
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508 - 509 | 0xdabe | Magic Number
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510 - 511 | checksum | The result of exoring 2-byte words 0 to 254
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---------- | ---------- | ----------------------------------------------------
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------------------------------------------------------------------------------
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------------------------------------------------------------------------------
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