[PATCH] commands: oftree: kill oftree -f
akurz at blala.de
Mon Jun 11 11:35:48 PDT 2018
On Mon, 11 Jun 2018, Sascha Hauer wrote:
> Being able to free the live device tree seemed like a good idea in the
> early days of device tree support when the first boards were brought up.
> It turned out to be illusory that noone stores pointers to the live tree
> which become invalid when oftree -f is executed. Enough people stumbled
> upon crashed boards with this option, so remove it finally.
oftree -f is still in use in boot scripts, e.g. for the kindle-mx50,
and at least one other board.
The usecase for the kindle-mx50 is
* DT based barebox
* ATAGs dependent antiquated, non upgradeable kernel
start_linux() (arch/arm/lib32/armlinux.c) wont do setup_tags() if there
still exists an oftree.
If there is an alternative way to make boot issue
ATAGs, removing the -f option would be fine.
May I mention an old (rejected) proposal about this issue
Also note: it's still in Documentation/user/devicetree.rst
More information about the barebox