Master Boot Record Structure; Partition Entry; Partition Types - Texas Instruments TMS320C6A816 Series Technical Reference Manual

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21.7.4.7.1 Master Boot Record: MBR
The Master Boot Record is the 1st sector of a memory device. It is made out of some executable code
and four partition entries. The aim of such a structure is to be able to divide the hard disk in partitions
mostly used to boot different systems (Microsoft Windows™, Linux, ...). Its structure is described in
Table 21-18 and Table
Table 21-20.
Offset
0000h
01BEh
01CEh
01DEh
01EEh
01FEh
Offset
0000h
0001h
0002h
0004h
0005h
0006h
0008h
000Ch
SPRUGX9 – 15 April 2011
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Preliminary
21-19. The valid partition types searched by the ROM Code are described in
Table 21-18. Master Boot Record Structure
Length [bytes] Entry Description
446 Optional Code
16 Partition Table Entry
16 Partition Table Entry
16 Partition Table Entry
16 Partition Table Entry
2 Signature
Table 21-19. Partition Entry
Length [bytes] Entry Description
1 Partition State
1 Partition Start Head
2 Partition Start Cylinder and Sector
1 Partition Type
16 Partition End Head
2 Partition End Cylinder and Sector
4 First sector position relative to the
beginning of media
4 Number of sectors in partition
Table 21-20. Partition Types
Partition Type
01h
04h, 06h, 0Eh
0Bh, 0Ch, 0Fh
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Value
(see Table 21-19)
(see Table 21-19)
(see Table 21-19)
(see Table 21-19)
AA55h
Value
00h: Inactive
80h: Active
H
s
C [7:0]-C [9:8]-S [5:0]
s s s
Refer to Table 21-20 for partial partition
types
H
e
C [7:0] - C [9:8] - S [5:0]
e e e
LBA = C .H.S + H .S + S
s s s
LBA = C .H.S + H .S + S
e e e
Nb = LBA - LBA + 1
s e s
Description
FAT12
FAT16
FAT32
ROM Code Memory and Peripheral Booting
Memory Booting
- 1
s
- 1
e
2017