It is sometimes useful to be able to define the entire default
environment in an external file. This implements a Kconfig option for
allowing that.
It is somewhat annoying to have two visible Kconfig options; it would
probably be more user-friendly to just have the string option (with
empty string obviously meaning not to use this feature). But then we'd
also need a hidden CONFIG that we can use in the #ifdef in
env_default.h, and I don't think one can set a def_bool based on
whether a string-valued config is empty or not.
I've tried to make the accepted format the same as the one the
mkenvimage tool accepts. I have no idea how portable the sed script
implementing the "allow embedded newlines in values" is. Nor do I know
if one can expect xxd to be available.
Signed-off-by: Rasmus Villemoes <rasmus.villem...@prevas.dk>
---
Makefile | 16 ++++++++++++++++
env/Kconfig | 18 ++++++++++++++++++
include/env_default.h | 4 ++++
3 files changed, 38 insertions(+)
diff --git a/Makefile b/Makefile
index 4981a2ed6f..e5ba5213fd 100644
--- a/Makefile
+++ b/Makefile
@@ -423,6 +423,7 @@ endif
version_h := include/generated/version_autogenerated.h
timestamp_h := include/generated/timestamp_autogenerated.h
+defaultenv_h := include/generated/defaultenv_autogenerated.h
no-dot-config-targets := clean clobber mrproper distclean \
help %docs check% coccicheck \
@@ -1366,6 +1367,10 @@ ifeq ($(wildcard $(LDSCRIPT)),)
@/bin/false
endif
+ifeq ($(CONFIG_DEFAULT_ENV_FROM_FILE),y)
+prepare1: $(defaultenv_h)
+endif
+
archprepare: prepare1 scripts_basic
prepare0: archprepare FORCE
@@ -1413,12 +1418,23 @@ define filechk_timestamp.h
fi)
endef
+define filechk_defaultenv.h
+ (grep -v '^#' | \
+ grep -v '^$$' | \
+ tr '\n' '\0' | \
+ sed -e 's/\\\x0/\n/' | \
+ xxd -i ; echo ", 0x00" ; )
+endef
+
$(version_h): include/config/uboot.release FORCE
$(call filechk,version.h)
$(timestamp_h): $(srctree)/Makefile FORCE
$(call filechk,timestamp.h)
+$(defaultenv_h): $(CONFIG_DEFAULT_ENV_FILE:"%"=%) FORCE
+ $(call filechk,defaultenv.h)
+
# ---------------------------------------------------------------------------
quiet_cmd_cpp_lds = LDS $@
cmd_cpp_lds = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) \
diff --git a/env/Kconfig b/env/Kconfig
index a24370786b..1baebd743b 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -482,4 +482,22 @@ config ENV_SIZE
endif
+config DEFAULT_ENV_FROM_FILE
+ bool "Create default environment from file"
+ help
+ Normally, the default environment is automatically generated
+ based on the settings of various CONFIG_* options, as well
+ as the CONFIG_EXTRA_ENV_SETTINGS. By selecting this option,
+ you can instead define the entire default environment in an
+ external file.
+
+config DEFAULT_ENV_FILE
+ string "Path to default environment file"
+ depends on DEFAULT_ENV_FROM_FILE
+ help
+ The path containing the default environment. The format is
+ the same as accepted by the mkenvimage tool: lines
+ containing key=value pairs, blank lines and lines beginning
+ with # are ignored.
+
endmenu
diff --git a/include/env_default.h b/include/env_default.h
index b574345af2..656d202cc7 100644
--- a/include/env_default.h
+++ b/include/env_default.h
@@ -22,6 +22,7 @@ static char default_environment[] = {
#else
const uchar default_environment[] = {
#endif
+#ifndef CONFIG_DEFAULT_ENV_FROM_FILE
#ifdef CONFIG_ENV_CALLBACK_LIST_DEFAULT
ENV_CALLBACK_VAR "=" CONFIG_ENV_CALLBACK_LIST_DEFAULT "\0"
#endif
@@ -108,6 +109,9 @@ const uchar default_environment[] = {
CONFIG_EXTRA_ENV_SETTINGS
#endif
"\0"
+#else /* CONFIG_DEFAULT_ENV_FROM_FILE */
+#include "generated/defaultenv_autogenerated.h"
+#endif
#ifdef DEFAULT_ENV_INSTANCE_EMBEDDED
}
#endif
--
2.15.1
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