[PATCH v2] wic/plugins/bootimg-efi-isar: gate root= with creator.rootdev not None

[Gourav Singh]

From: Cedric Hombourger <cedric.h...@siemens.com>

Checks for creator.rootdev not being None were missing and would cause
the kernel command line to read "root=None". When using the Discoverable
Partitions Specification, we really want no root= parameter on the
kernel command line (and root=None is anyhow not a valid option).

Signed-off-by: Cedric Hombourger <cedric.h...@siemens.com>
Signed-off-by: Gourav Singh <goura...@siemens.com>
---
meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py b/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py
index 6bc78d42..6c6698d6 100644
--- a/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py
+++ b/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py
@@ -104,7 +104,7 @@ class BootimgEFIPlugin(SourcePlugin):
(get_bitbake_var("KERNEL_IMAGETYPE"), get_bitbake_var("INITRAMFS_LINK_NAME"))

label = source_params.get('label')
- label_conf = "root=%s" % creator.rootdev
+ label_conf = f" root={creator.rootdev}" if creator.rootdev else ""
if label:
label_conf = "LABEL=%s" % label

@@ -201,7 +201,8 @@ class BootimgEFIPlugin(SourcePlugin):
boot_conf += "linux /%s\n" % kernel

label = source_params.get('label')
- label_conf = "LABEL=Boot root=%s" % creator.rootdev
+ label_conf = "LABEL=Boot"
+ label_conf += f" root={creator.rootdev}" if creator.rootdev else ""
if label:
label_conf = "LABEL=%s" % label

@@ -366,7 +367,7 @@ class BootimgEFIPlugin(SourcePlugin):

with tempfile.TemporaryDirectory() as tmp_dir:
label = source_params.get('label')
- label_conf = "root=%s" % creator.rootdev
+ label_conf = f" root={creator.rootdev}" if creator.rootdev else ""
if label:
label_conf = "LABEL=%s" % label

--
2.39.5

[MOESSBAUER, Felix]

On Wed, 2026-04-08 at 12:14 +0530, 'Gourav Singh' via isar-users wrote:
> From: Cedric Hombourger <cedric.h...@siemens.com>
>
> Checks for creator.rootdev not being None were missing and would cause
> the kernel command line to read "root=None". When using the Discoverable
> Partitions Specification, we really want no root= parameter on the
> kernel command line (and root=None is anyhow not a valid option).

Hi, the change itself is fine, but please also apply the same
modification to bootimg-pcbios-isar.py.

As the isar variants of the plugins are based on upstream OE, please
also consider upstreaming this change (if not already fixed upstream).

Felix

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