Adapted HP-PA boot sector code to upcomming PALO header version 5
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@ -33,7 +33,8 @@ PowerPC Reference Platform (PReP), for IBM PowerPC
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Common Hardware Reference Platform (CHRP), for IBM PowerPC
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HP-PA via PALO
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HP-PA via PALO header version 4
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HP-PA via PALO header version 5
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Combinations of boot mechanisms:
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- SYSLINUX isohybrid MBR
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@ -949,7 +950,7 @@ in the ISO image [without causing overlapping between partitions].
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------------------------------------------------------------------------------
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HP-PA via PALO
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HP-PA via PALO header version 4
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for HP PA-RISC
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Sources:
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@ -970,8 +971,10 @@ Boot sector components:
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Byte Range | Value | Meaning
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---------- | ---------- | ----------------------------------------------------
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0 - 1 | 0x8000 | Magic
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2 - 5 | "PALO" |
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6 - 7 | 0x0004 | Version
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2 - 6 | "PALO" | Zero terminated string
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7 - 7 | 4 | Version
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8 - 11 | kern32_adr | Byte address of the "HPPA 32-bit kernel" file
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| | genisoimage option -hppa-kernel-32
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@ -995,6 +998,116 @@ Byte Range | Value | Meaning
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---------- | ---------- | ----------------------------------------------------
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------------------------------------------------------------------------------
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HP-PA via PALO header version 5
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for HP PA-RISC
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Sources:
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Public mail conversations with Helge Deller, beginning with
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https://lists.debian.org/debian-hppa/2014/01/msg00016.html
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http://git.kernel.org/cgit/linux/kernel/git/deller/palo.git/tree/lib/
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(especially struct firstblock in common.h and struct partition in part.h)
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There are five parameters which get encoded into the first 248 bytes of the
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System Area: cmdline, bootloader, 32-bit kernel, 64-bit kernel, and ramdisk.
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They are all mandatory.
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While cmdline is simply a string of at most 1023 characters, the other four
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point to data files inside the ISO image.
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Several fields of the firstblock shall be hardcoded to 0, on advise of
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Helge Deller. Their description is shown in round brackets.
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The partition table format is the same as with MBR.
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>>> ??? what block range gets marked in which partition ?
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>>> If this is only for CD/DVD/BD images, then no partitioning is needed.
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All numbers are recorded big endian.
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Except flags, all 4-byte integers are signed.
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Boot sector components:
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Byte Range | Value | Meaning
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---------- | ---------- | ----------------------------------------------------
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0 - 1 | 0x8000 | Magic
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2 - 6 | "PALO" | Zero terminated string
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7 - 7 | 5 | Version
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8 - 11 | kern32_adr | Byte address of the 32-bit kernel file
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12 - 15 | kern32_len | Byte count of the 32-bit kernel file
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16 - 19 | ramdsk_adr | Byte address of the ramdisk file
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20 - 23 | ramdsk_len | Byte count of the ramdisk file
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24 - 141 | 0 | All 0s. Old command line of version 4.
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220 - 223 | 0 | (Length of uncompressed 32-bit kernel)
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224 - 227 | 0 | (Length of uncompressed 64-bit kernel)
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228 - 231 | 0 | (flags)
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232 - 235 | kern64_adr | Byte address of the 64-bit kernel file
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236 - 239 | kern64_len | Byte count of the 64-bit kernel file
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240 - 243 | ipl_adr | Byte address of the bootloader file
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244 - 247 | ipl_len | Byte count of the bootloader file
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248 - 251 | ipl_entry | >>> Meaning unclear
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446 - 461 | ========== | MBR/DOS Partition Table Entry for partition 1
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446 - 446 | status | Governs bootability:
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| | 0x80 = bootable/active , 0x00 non-bootable/inactive
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447 - 449 | ========== | C/H/S address of partition start
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447 - 447 | start_head | Heads part of start address.
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448 - 448 | start_c_s | Bits 0 to 5 : Sectors part of start address.
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| | Bits 6 to 7 : Bits 8 to 9 of cylinders part.
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449 - 449 | start_cyl | Lower 8 bits of cylinders part of start address
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450 - 450 | part_type | Partition type indicates the purpose or kind of
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| | filesystem in the partition.
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451 - 453 | ========== | C/H/S address of last absolute sector in partition
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451 - 451 | end_head | Heads part of end address.
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452 - 452 | end_c_s | Bits 0 to 5 : Sectors part of end address.
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| Values: 1 to 63, not 0.
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| | Bits 6 to 7 : Bits 8 to 9 of cylinders part.
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453 - 453 | end_cyl | Lower 8 bits of cylinders part of end address
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454 - 457 | start_lba | LBA of first absolute sector in partiton.
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| | Block size is 512. Counting starts at 0.
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458 - 461 | num_blocks | Number of sectors in partition.
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462 - 477 | ========== | Partition Table Entry for partition 2
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| part_entr2 | 16 bytes. Format as with partition 1.
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| | All 0 means that partition is unused/undefined.
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478 - 493 | ========== | Partition Table Entry for partition 3
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| part_entr3 | 16 bytes. See above.
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494 - 509 | ========== | Partition Table Entry for partition 4
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| part_entr4 | 16 bytes. See above.
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510 - 510 | 0x55 | MBR signature
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511 - 511 | 0xaa | MBR signature
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1024 -2047 | cmdline | Zero terminated command line of up to
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| | 1023 characters
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---------- | ---------- | ----------------------------------------------------
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------------------------------------------------------------------------------
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