A recent update to boot-deploy 0.9.x has dropped support for using /etc/boot/cmdline.txt to configure the kernel parameters used on boot. If you are currently using this file to configure kernel parameters, please move these parameters to a new variable named deviceinfo_kernel_cmdline_append in the /etc/deviceinfo file.
For example, if you have the following in /etc/boot/cmdline.txt:
quiet ipv6.disable=1 iomem=relaxed
Then you will want to add the following to /etc/deviceinfo:
deviceinfo_kernel_cmdline_append="quiet ipv6.disable=1 iomem=relaxed"
After this manual migration is performed, it is safe to remove /etc/boot/cmdline.txt.
Also see: