Is there an
MBR?
Get Booting File
Is this a
FAT12/16/32
partition?
Yes
No
Success
Failed
No
Read 1st sector
Is there an
active primary
FAT 12/16/32
partition?
Read partition 1st sector
Yes
Yes No
Buffers FAT entries in FAT
Buffer
Failed
Passed
Failed
Passed
Failed
Failed
Find booting file
in the root directory
Functional Description
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Figure 26-19. MMC/SD Booting, Get Booting File
26.1.7.5.7.1 Master Boot Record (MBR)
The Master Boot Record is the 1
st
sector of a memory device. It is made out of some executable code and
4 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 (i.e. Microsoft Windows™, Linux, …). Its structure is described in Table 26-
22 and Table 26-23. The valid partition types searched by the ROM Code are described in Table 26-24.
Table 26-22. Master Boot Record Structure
Offset Length[bytes] Entry Description Value
0000h 446 Optional Code
01BEh 16 Partition Table Entry (see Table 26-23)
01CEh 16 Partition Table Entry (see Table 26-23)
01DEh 16 Partition Table Entry (see Table 26-23)
01EEh 16 Partition Table Entry (see Table 26-23)
01FEh 2 Signature AA55h
4134
Initialization SPRUH73H–October 2011–Revised April 2013
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