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Options available to override the compression algorithm used by the linker
4.7.2 Options available to override the compression algorithm used by the linkerThe linker has options to disable compression or to specify a compression algorithm to be used. You can override the compression algorithm used by the linker by either:
To specify a compression algorithm, use the number of the required compressor on the linker
command line, for example:
armlink --datacompressor 2 …
Use the command-line option
--datacompressor list to get a list of
compression algorithms available in the linker:armlink --datacompressor list
…
Num Compression algorithm
========================================================
0 Run-length encoding
1 Run-length encoding, with LZ77 on small-repeats
2 Complex LZ77 compression
When choosing a compression algorithm be aware that:
The linker prefers compressor 0 or 1 where the
data contains mostly zero-bytes (>75%). Compressor 2 is chosen where the data contains
few zero-bytes (<10%). If the image is made up only of ARM code, then ARM decompressors
are used automatically. If the image contains any Thumb code, Thumb decompressors are used.
If there is no clear preference, all compressors are tested to produce the best overall
size.
NoteIt is not possible to add your own compressors into the linker. The algorithms that are available, and how the linker chooses to use them, might change in the future.Related conceptsRelated reference | ||||||||||
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