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New system area type 2 for Little Endian MIPS DEC boot block.

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This commit is contained in:
Thomas Schmitt
2010-10-14 22:34:32 +02:00
parent a0ba4b976c
commit a75fb9a894
4 changed files with 215 additions and 19 deletions
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26
doc/boot_sectors.txt
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@ -16,13 +16,17 @@ specifications, some is just rumor which happens to work (maybe not even that).
EL Torito CD booting, for PC-BIOS x86, PowerPC, (old) Mac, EFI.
MBR, for PC-BIOS x86 from (pseudo-) hard disk
- SYSLINUX Isohybrid MBR
- SYSLINUX isohybrid MBR
- GRUB2 grub-mkrescue MBR.
MIPS Volume Header, for MIPS Big Endian, e.g. SGI Indigo2.
DEC Boot Block, for MIPS Little Endian , e.g. DECstation.
------------------------------------------------------------------------------
EL Torito CD booting
for PC-BIOS x86, PowerPC, (old) Mac, EFI
@ -239,9 +243,9 @@ Byte Range | Value | Meaning
24 - 63 | 0 | Reserved
---------- | ---------- | ----------------------------------------------------
------------------------------------------------------------------------------
MBR
for PC-BIOS x86 from (pseudo-) hard disk
@ -480,7 +484,9 @@ Cleartext part:
------------------------------------------------------------------------------
MIPSEL Little Endian MIPS , e.g. DECstation
DEC Boot Block
for MIPS Little Endian , e.g. DECstation
Sources:
cdrkit-1.1.10/genisoimage/boot-mipsel.c
@ -495,6 +501,7 @@ Sources:
There seems to be only one boot file possible.
Some information needs to be read out of the ELF headers of this boot file.
Byte Range | Value | Meaning
---------- | ---------- | ----------------------------------------------------
@ -514,12 +521,13 @@ Byte Range | Value | Meaning
| |
24 - 31 | ========== | Boot Map Entry 1
| |
24 - 27 | count | Segment size in file.
24 - 27 | seg_size | Segment size in file. Blocks of 512 bytes.
| | Stems from ELF header of boot file.
| | (Elf32_Phdr field p_filesz + 511) / 512;
| |
28 - 31 | start | Segment file offset
| | Stems from ELF header of boot file.
28 - 31 | seg_start | Segment file offset. Blocks 512 bytes.
| | ISO 9660 LBA of boot file * 4 plus offset
| | + offset which stems from ELF header of boot file:
| | (Elf32_Phdr field p_offset + 511) / 512;
| |
32 - 431 | ========== | Boot Map Entries 2 to 51
@ -547,15 +555,15 @@ Byte Range | Value | Meaning
0 - 3 | | ( Segment type )
| |
4 - 7 | p_offset | /* Segment file offset */
| -> start | Needed for start
|-> seg_start| Needed for seg_start
| |
8 - 11 | p_vaddr | /* Segment virtual address */
=load_address| Needed for load_address
| =load_adr | Needed for load_adr
| |
12 - 15 | | (Segment physical address)
| |
16 - 19 | p_filesz | /* Segment size in file */
| -> count | Needed for count
|-> seg_size | Needed for seg_size
| |