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The defaultenv should be rebuilt once a file in it has changed.
the genenv script always generates the environment file to a temporary
file. Only if it has changed to the last target file the temporary file
is moved over the target file. This means we always have to call genenv,
thus replace "if_changed" with "cmd".
With this dependencies are correctly tracked. New or changed files
result in new image builds whereas unchanged environments do not
unnecessarily result in new images.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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From fcffd0176b3394cc664d9bf5b31b053253323bfb Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <sam@ravnborg.org>
Date: Tue, 26 Dec 2017 16:47:16 +0100
Subject: [PATCH 1/4] build: fix that defaultenv is always rebuilt
Using following pattern:
target: prerequisite FORCE
$(call cmd,foo)
is almost always wrong. Due to FORCE target will be rebuilt
using cmd_foo no mater the timestamps.
The following pattern:
target: prerequisite FORCE
$(call if_changed,foo)
Will call cmd_foo only if:
- target is not updated
- or command to built target has changed
But to make this work target must be added to the
list af targets built.
This can be done by assigning target to extra-y or targets.
Use the latter pattern for defaultenv to avoid rebuilding
the environmentt for each build.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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DFU is for device firmware upgrade, but for development purposes it's
sometmes useful to just start a kernel vie DFU. This adds a boot option
for doing this and also the corresponding counterpart on the host. With
this it's possible to boot a system with:
scripts/dfuboot.sh -k linuximage -d dtb -c "root=ubi0:root ubi.mtd=ubi rootfstype=ubifs ignore_loglevel"
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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We can compile barebox for multiple boards at once, but currently
they all share a single default environment. This patch adds a
defaultenv_append() which boards can call to customize the default
environment during runtime. Each board now generate default environment
snippets using bbenv-y and add them during runtime with defaultenv_append()
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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