From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from astoria.ccjclearline.com ([64.235.106.9]) by bombadil.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1Ruv8Z-00024m-QS for barebox@lists.infradead.org; Wed, 08 Feb 2012 00:11:52 +0000 Received: from cpec03f0ed08c7f-cm001ac318e826.cpe.net.cable.rogers.com ([99.241.91.63] helo=crashcourse.ca) by astoria.ccjclearline.com with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.69) (envelope-from ) id 1Ruv8W-0003Ob-5O for barebox@lists.infradead.org; Tue, 07 Feb 2012 19:11:48 -0500 Date: Tue, 7 Feb 2012 19:11:42 -0500 (EST) From: "Robert P. J. Day" Message-ID: MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: need some clarification on how environments work To: "U-Boot Version 2 (barebox)" ok, i'm trying to figure out how environments work so bear with me as i'm going to ask a number of questions. i'm reading this page: http://wiki.barebox.org/doku.php?id=user:environment and based on that, i took a look at what i have running on my beagle xM having configured and built *entirely* using defaults. confusingly, i have no /dev/env0 as that web page seems to suggest. here's what's in my dev directory: barebox@Texas Instrument's Beagle:/ ls -l dev cr-------- 4294967295 zero crw------- 134217728 ram0 crw------- 7496 defaultenv crw------- 4294967295 mem crw------- 1024 twl4030 crw------- 3963617280 disk0 crw------- 123346944 disk0.0 so i have a "defaultenv" file there. i puzzled over this for a while until i noticed that there is no arch/arm/boards/beagle/env/ directory, as there is for most of the other boards. so let's step back and look at the relevant source in common/Makefile: ===== ifdef CONFIG_DEFAULT_ENVIRONMENT $(obj)/startup.o: include/generated/barebox_default_env.h $(obj)/env.o: include/generated/barebox_default_env.h ifeq ($(CONFIG_DEFAULT_ENVIRONMENT_GENERIC),y) DEFAULT_ENVIRONMENT_PATH = "defaultenv" endif ifneq ($(CONFIG_DEFAULT_ENVIRONMENT_PATH),"") DEFAULT_ENVIRONMENT_PATH += $(CONFIG_DEFAULT_ENVIRONMENT_PATH) endif ENV_FILES := $(shell cd $(srctree); for i in $(DEFAULT_ENVIRONMENT_PATH); do find $${i} -type f -exec readlink -f '{}' \;; done) endif # ifdef CONFIG_DEFAULT_ENVIRONMENT barebox_default_env: $(ENV_FILES) $(Q)$(srctree)/scripts/genenv $(srctree) $(objtree) $(DEFAULT_ENVIRONMENT_PATH) ===== as well as the menu selections from "make menuconfig": [*] Compile in default environment [*] Default environment generic () Default environment path so now, the questions. first, what is the "default" environment? is that the one found for the board in arch/arm/boards//env/config? so that there is *no* current default environment for the beagleboard right now? also, from the Kconfig help text: CONFIG_DEFAULT_ENVIRONMENT: Enabling this option will give you a default environment when the environment found in the environment sector is invalid is that true? as in, the "default" environment will only be used if what's in the environment sector is found to be invalid? next, what is meant by the "generic" default environment? from the Kconfig file, "With this option barebox will use the generic default environment found under defaultenv/ in the src tree. The Directory given with DEFAULT_ENVIRONMENT_PATH will be added to the default environment. This should at least contain a /env/config file. This will be able to overwrite the files from defaultenv." ok, i can appreciate that -- it's a "generic" environment, defined by the file defaultenv/config, and it's apparently what i got, is that it? but why the reference to DEFAULT_ENVIRONMENT_PATH, which is an entirely separate Kconfig option? and regarding the final setting, CONFIG_DEFAULT_ENVIRONMENT_PATH, how does that affect the first two settings? i'm just trying to puzzle all this out. rday -- ======================================================================== Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ======================================================================== _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox