when use linux xz command to create .xz file for embedded device to decompress, memory must be taken into
consideration.
to control memory used, following opt should be considerated:
(https://www.freebsd.org/cgi/man.cgi?query=xz&sektion=1)
--memlimit-compress=limit
--memlimit-decompress=limit
--lzma2[=options]
Add LZMA1 or LZMA2 filter to the filter chain. These filters
can be used only as the last filter in the chain.
LZMA1 is a legacy filter, which is supported almost solely due
to the legacy .lzma file format, which supports only LZMA1.
LZMA2 is an updated version of LZMA1 to fix some practical
issues of LZMA1. The .xz format uses LZMA2 and doesn't support
LZMA1 at all. Compression speed and ratios of LZMA1 and LZMA2
are practically the same.
LZMA1 and LZMA2 share the same set of options:
preset=preset
Reset all LZMA1 or LZMA2 options to preset. Preset con-
sist of an integer, which may be followed by single-let-
ter preset modifiers. The integer can be from 0 to 9,
matching the command line options -0 ... -9. The only
supported modifier is currently e, which matches
--extreme. If no preset is specified, the default values
of LZMA1 or LZMA2 options are taken from the preset 6.
dict=size
--info-memory
Display, in human-readable format, how much physical memory
(RAM) xz thinks the system has and the memory usage limits for
compression and decompression, and exit successfully.
xz --keep --check=crc32 --memlimit-decompress=32KiB --lzma2=dict=32KiB toxz.bin
