defaultenv: use a compressed version when embedded in barebox

enable it only if a compression is enabled
support gzip, bzip2 and lzo

you will be able to choose which compression to use

-rw-r--r--  1 root root    8436 Dec 15 01:35 barebox_default_env
-rw-r--r--  1 root root    2782 Dec 15 01:35 barebox_default_env.bz2
-rw-r--r--  1 root root    2691 Dec 15 01:38 barebox_default_env.gz
-rw-r--r--  1 root root    3262 Dec 15 01:38 barebox_default_env.lzo

with using gzip and the default env we can save 5.6KiB (5,745 bytes)
with using bzip2 and the default env we can save 5.5KiB (5,654 bytes)
with using lzo and the default env we can save 5.1KiB (5,174 bytes)

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 28 insertions, 0 deletions

diff --git a/common/Kconfig b/common/Kconfig
index f8df3dd358..ca4f09922c 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -427,6 +427,34 @@ config DEFAULT_ENVIRONMENT
 	  Enabling this option will give you a default environment when
 	  the environment found in the environment sector is invalid
 
+config DEFAULT_ENVIRONMENT_COMPRESSED
+	bool
+	depends on DEFAULT_ENVIRONMENT
+	default y if ZLIB
+	default y if BZLIB
+	default y if LZO_DECOMPRESS
+
+if DEFAULT_ENVIRONMENT_COMPRESSED
+
+choice
+	prompt "compression"
+
+config DEFAULT_ENVIRONMENT_COMPRESSED_GZIP
+	bool "gzip"
+	depends on ZLIB
+
+config DEFAULT_ENVIRONMENT_COMPRESSED_BZIP2
+	bool "bzip2"
+	depends on BZLIB
+
+config DEFAULT_ENVIRONMENT_COMPRESSED_LZO
+	bool "lzo"
+	depends on LZO_DECOMPRESS
+
+endchoice
+
+endif
+
 config DEFAULT_ENVIRONMENT_GENERIC
 	bool
 	depends on DEFAULT_ENVIRONMENT