[ptxdist] [PATCH] image-root-cpio: Add compressor options to the env.

[Christian Melki <christian.melki@t2data.com>]

* xz needs crc32 instead of crc64 for the kernel cpio.
* Set zstd compression level to the same as for the kernel (19).
* Use multithreading for zstd (deterministic, afaiu).

Actively decided against -T0 for xz, as compression
is not deterministic when number of threads varies.

Signed-off-by: Christian Melki <christian.melki@t2data.com>
---
 rules/image-root-cpio.make | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/rules/image-root-cpio.make b/rules/image-root-cpio.make
index fdb0ccfff..eb09dd53e 100644
--- a/rules/image-root-cpio.make
+++ b/rules/image-root-cpio.make
@@ -26,6 +26,9 @@ IMAGE_ROOT_CPIO_CONFIG	:= cpio.config
 
 IMAGE_ROOT_CPIO_ENV := \
 	FORMAT="newc" \
+	ZSTD_CLEVEL="19" \
+	ZSTD_NBTHREADS="0" \
+	XZ_OPT="--check=crc32" \
 	COMPRESS=$(call remove_quotes, $(PTXCONF_IMAGE_ROOT_CPIO_COMPRESSION_UTIL))
 
 ifdef PTXCONF_IMAGE_ROOT_CPIO
-- 
2.30.2


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