[OE-core] [PATCH 2/3] wic: allow multiple /boot partitions with different content

[Enrico Scholz]

From: Enrico Scholz <enrico.scholz at ensc.de>

It can be useful to have multiple partitions with '--source bootimg-partition'
but different content.

E.g. for TI AM335x, one boot partition can contain an first stage
bootloader ("MLO"), while the real bootloader and kernel plus devicetree
are in another one.

Patch allows to specify multiple IMAGE_BOOT_FILES with optional "_label-XXX"
or "_uuid-XXX" overrides.

E.g. with this patch, a .wks file with

| part --source bootimg-partition ... --label=mlo --active
| part --source bootimg-partition ... --label=boot0
| part --source bootimg-partition ... --label=boot1

and a recipe with

| IMAGE_BOOT_FILES_label-mlo = "\
|   MLO-${MACHINE}.img;MLO \
| "
|
| IMAGE_BOOT_FILES_label-boot0 = "\
|   u-boot-${MACHINE}.img;u-boot.img \
|   zImage \
| "
|
| IMAGE_BOOT_FILES_label-boot1 = "${IMAGE_BOOT_FILES_label-boot0}"
|
| WICVARS += " \
|   IMAGE_BOOT_FILES_label-mlo \
|   IMAGE_BOOT_FILES_label-boot0 \
|   IMAGE_BOOT_FILES_label-boot1 \
| "

is possible.  It will create one partition with the MLO and two redundant
ones with the uboot + kernel.

Signed-off-by: Enrico Scholz <enrico.scholz at ensc.de>
---
 scripts/lib/wic/plugins/source/bootimg-partition.py | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/scripts/lib/wic/plugins/source/bootimg-partition.py b/scripts/lib/wic/plugins/source/bootimg-partition.py
index ca074a3..67e5498 100644
--- a/scripts/lib/wic/plugins/source/bootimg-partition.py
+++ b/scripts/lib/wic/plugins/source/bootimg-partition.py
@@ -54,7 +54,7 @@ class BootimgPartitionPlugin(SourcePlugin):
         - sets up a vfat partition
         - copies all files listed in IMAGE_BOOT_FILES variable
         """
-        hdddir = "%s/boot" % cr_workdir
+        hdddir = "%s/boot.%d" % (cr_workdir, part.lineno)
         install_cmd = "install -d %s" % hdddir
         exec_cmd(install_cmd)
 
@@ -65,10 +65,19 @@ class BootimgPartitionPlugin(SourcePlugin):
 
         logger.debug('Kernel dir: %s', bootimg_dir)
 
-        boot_files = get_bitbake_var("IMAGE_BOOT_FILES")
+        boot_files = None
+        for (fmt, id) in (("_uuid-%s", part.uuid), ("_label-%s", part.label), (None, None)):
+            if fmt:
+                var = fmt % id
+            else:
+                var = ""
+
+            boot_files = get_bitbake_var("IMAGE_BOOT_FILES" + var)
+            if boot_files is not None:
+                break
 
-        if not boot_files:
-            raise WicError('No boot files defined, IMAGE_BOOT_FILES unset')
+        if boot_files is None:
+            raise WicError('No boot files defined, IMAGE_BOOT_FILES unset for entry #%d' % part.lineno)
 
         logger.debug('Boot files: %s', boot_files)
 
-- 
2.9.5