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Technical Support
On-Line Manuals
Linker User Guide
Preface
Overview of the Linker
Linking Models Supported by armlink
Image Structure and Generation
Linker Optimization Features
Elimination of common debug sections
Elimination of common groups or sections
Elimination of unused sections
Elimination of unused virtual functions
About linker feedback
Example of using linker feedback
Optimization with RW data compression
How the linker chooses a compressor
Options available to override the compression algo
How compression is applied
Considerations when working with RW data compressi
Function inlining with the linker
Factors that influence function inlining
About branches that optimize to a NOP
Linker reordering of tail calling sections
Restrictions on reordering of tail calling section
Linker merging of comment sections
Getting Image Details
Accessing and Managing Symbols with armlink
Scatter-loading Features
Scatter File Syntax
Linker Command-line Options
Linker Steering File Command Reference
Via File Syntax
Considerations when working with RW data compression
| Non-Confidential |  PDF version | ARM DUI0377H | ||
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| Home > Linker Optimization Features > Optimization with RW data compression > Considerations when working with RW data compression | ||||
4.7.4 Considerations when working with RW data compression
There are some considerations to be aware of when working with RW data compression.
When working with RW data compression:
-
Use the linker option
--mapto see where compression has been applied to regions in your code. - The linker in RealView Compiler Tools (RVCT) v4.0 and later turns off RW compression if there is a reference from a compressed region to a linker-defined symbol that uses a load address.
- If you are using an ARM® processor with on-chip cache, enable the cache after decompression to avoid code coherency problems.
Compressed data sections are automatically decompressed at run time, providing
__main is executed, using code from the ARM libraries. This code must be
placed in a root region. This is best done using InRoot$$Sections in a
scatter file.If you are using a scatter file, you can specify that a load or execution region is not to
be compressed by adding the
NOCOMPRESS attribute.Related concepts
| Non-Confidential | PDF version | ARM DUI0377H |
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