GE DS200TCEAG1BRE module
Technical data of product parameters
Embedding the symbol table creates self contained images. A target may not have any external
media, for example RTEMS tests, or there is a requirement to avoid the management need to
match the symbol table with the kernel base image. Embedding the symbol table requires a
2-pass link process making the application’s build system more complicated.
A dynamically loadable symbol table is simpler to create however the symbol table and the kernel base image must match or the behaviour is undefined. There is currently no mechnanisumDS200TCEAG1BREnsure the symbol table and the kernel image match The rtems-syms command is run against
the base kernel image and the generated symbol table is installed on to the target hardware and
loaded before any other modules.
DS200TCEAG1BRE
The symbol table is an ELF object file in the target’s ELF format and is built using the target’s
RTEMS C compiler. The rtems-syms command searches for the C compller under the prefix this
command is installed under or the system path. If the target’s C compiler is not located in either
of these paths use the option -c or –cc to specify the path to the compiler.
The rtems-syms command loads the base kernel image’s ELF file and reads the global or public
symbols, creates a temporary C file and then compiles it using the target’s RTEMS C compiler.
The command automatically detects the architecture from the base kernel image’s ELF file and
uses it to create the C compiler’s name. The optionDS200TCEAG1BREprefix can be used to override
the executable prefix used.
It is important to supply suitable C compiler flags (cflags) that match the kernel image’s so the
symbol table can be linked or loade2-Pass linking is used to embed a symbol table in a base kernel image. The first link pass is a
normal RTEMS kernel link process. The link output is passed to the rtems-syms command and
the -e or –embed option is used. The symbol table object file created by rtems-syms is added
to the linker command used in the first pass to create the second pass. The address map will
change between the first pass and second pass without causing a problem, the symbol table
embedded in the second link pass will adjust the symbol addresses to match
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