[PATCH] bootm: filter out "<NULL>" rootopts to avoid kernel cmdline noise

[Sascha Hauer]

Hi Alexander,

On Thu, Apr 16, 2026 at 03:55:12PM +0300, Alexander Shiyan wrote:
> When rootopts is set to the literal string "<NULL>" (e.g., due to a
> missing or invalid value in cdev_get_linux_root_and_opts), the resulting
> kernel command line contains "root=/dev/... <NULL>", which is invalid
> and may cause boot failures or confusion.
> 
> This patch checks for the "<NULL>" string in rootopts and replaces it
> with NULL before calling format_root_bootarg(), effectively omitting
> the erroneous token from the command line.

I would rather avoid setting it to "<NULL>" in the first place.

Does the patch I just sent help or is there another place where this
happens?

Sascha

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