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xz_wrap.sh parses the the xz help output to test if the selected BCJ
filter is actually supported. $BCJ might be empty though for some
architectures like Mips, so test the variable for being non-empty before
grepping for the BCJ filter to avoid warnings from grep:
Usage: grep [OPTION]... PATTERNS [FILE]...
Try 'grep --help' for more information.
Fixes: 02898c798d ("scripts: Select XZ --arm64 BCJ filter for 64-bit arm")
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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The XZ decompressor in barebox has BCJ filter support for THUMB, but
like Linux, it's unused and instead the ARM BCJ filter is used.
Fixing that lets us save a few kilobytes, which is especially useful for
legacy configuration that fit a whole barebox into limited on-chip SRAM
(and not only the prebootloader). For example, with this patch applied
barebox-am33xx-beaglebone-mlo.img is shrinked 3K from 109236 to 106028 bytes.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20231020180912.2914428-1-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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This change will select the arm64 BCJ filter for aarch64 instead of
the arm filter which was always selected for arm based architectures.
The selected filter is also tested, by looking if it is present in
the long help message of xz, this is because the arm64 BCJ filter is
a recent addition to xz.
Signed-off-by: Jules Maselbas <jmaselbas@zdiv.net>
Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20230907152047.102747-2-jmaselbas@zdiv.net
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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This adds xz decompression support from the kernel. Both compressing
the barebox binary with xz and decompressing xz files on the commandline
is supported.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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