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Mentioned boot image address in newer GRUB2 MBR

release-1.5.4.branch
Thomas Schmitt 8 years ago
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654ff82345
  1. 15
      doc/boot_sectors.txt

15
doc/boot_sectors.txt

@ -1351,12 +1351,21 @@ Sources:
Mailing list conversations with Vladimir Serbinenko.
The MBR file that is used with GRUB2 script grub-mkrescue needs only a
partition table entry which describes the image size.
The MBR file that is used with older versions of GRUB2 script grub-mkrescue
needs only a partition table entry which describes the image size.
Newer versions get patched by the block address of the content of the first
El Torito boot image. See grub-mkrescue use of xorrisofs option --grub2-mbr.
Byte Range | Value | Meaning
---------- | ---------- | ----------------------------------------------------
0 - 445 | = opaque = | GRUB2 machine code provided by MBR template
0 - 431 | = opaque = | GRUB2 machine code provided by MBR template
| |
432 - 439 | bootimg_adr| With newer versions of grub-mkrescue:
| | Block address of the start of the boot image file
| | content plus 4. Block size is 512.
| | 64 bit Little-endian.
| |
440 - 445 | = opaque = | provided by MBR template
| |
446 - 509 | ========== | Partition table
| |

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