The layout of the Multiboot header must be as follows:
| Offset | Type | Field Name | Note
|
| 0 | u32 | magic | required
|
| 4 | u32 | flags | required
|
| 8 | u32 | checksum | required
|
| 12 | u32 | header_addr | if flags[16] is set
|
| 16 | u32 | load_addr | if flags[16] is set
|
| 20 | u32 | load_end_addr | if flags[16] is set
|
| 24 | u32 | bss_end_addr | if flags[16] is set
|
| 28 | u32 | entry_addr | if flags[16] is set
|
| 32 | u32 | mode_type | if flags[2] is set
|
| 36 | u32 | width | if flags[2] is set
|
| 40 | u32 | height | if flags[2] is set
|
| 44 | u32 | depth | if flags[2] is set
|
The fields magic, flags and checksum are defined in
Header magic fields, the fields header_addr,
load_addr, load_end_addr, bss_end_addr and
entry_addr are defined in Header address fields, and the
fields mode_type, width, height and depth are
defind in Header graphics fields.