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CONFIG_ARM_APPENDED_DTB: Use appended device tree blob to zImage (EXPERIMENTAL)

General informations

The Linux kernel configuration item CONFIG_ARM_APPENDED_DTB:

Help text

With this option, the boot code will look for a device tree binary (DTB) appended to zImage (e.g. cat zImage <filename>.dtb > zImage_w_dtb).

This is meant as a backward compatibility convenience for those systems with a bootloader that can't be upgraded to accommodate the documented boot protocol using a device tree.

Beware that there is very little in terms of protection against this option being confused by leftover garbage in memory that might look like a DTB header after a reboot if no actual DTB is appended to zImage. Do not leave this option active in a production kernel if you don't intend to always append a DTB. Proper passing of the location into r2 of a bootloader provided DTB is always preferable to this option.



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