Chapter 7: Flash Application Layout
33
TI
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89 / TI
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92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
7.1.3. Application Header
The OS keeps track of apps through the application header. The application
header contains information about the application itself. The header contains the
internal name of the application, flags, the length of the application’s data
segment, an offset to the beginning of application code, an offset to the
beginning of initial data, and the length of initial data.
Lengths and offsets are stored most significant byte first — the convention used
in the Motorola 68000 microprocessor.
This header is created by the MKAPPLET utility.
The following fields may be accessed through the AppHdr structure.
Offset
(bytes)
Length
(bytes) Contents
0 4 magic number (0x167B533D)
4 8 internal application name (padded with trailing zeros to eight
bytes)
12 24 reserved (fill with zeros)
36 2 flags
38 4 length of data segment
42 4 byte offset to code segment
46 4 byte offset to initial data table
50 4 length of initial data table
54 4 length of optional header — additional information can be stored
just after the application header.
58
n
optional header — this information is ignored by the OS.
Table 7.2: Application Header Format
7.1.3.1. Magic Number
The magic number marks the beginning of the app header.
7.1.3.2. Internal Application Name
Every application has a unique internal name.
Note:
This field must match the internal application name in the Flash header. The internal
application names in the app header and Flash header are case sensitive and must be
identical.
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