Re: Using a custom device tree file
Am Sonntag, 11. Februar 2018, 22:24:51 CET schrieb Rainer Dorsch:
> Am Sonntag, 11. Februar 2018, 13:20:07 CET schrieb Vagrant Cascadian:
> > On 2018-02-11, Rainer Dorsch wrote:
> > > I try to use a custom device tree file, but uEnv.txt does not have any
> > > effect:
> > >
> > > rd@mohot:~$ cat /boot/uEnv.txt
> > > fdtfile=imx6dl-hummingboard-spi.dtb
> > ...
> > > Do I need to run flash-kernel or something else that uEnv.txt has any
> > > effect?
> > I don't believe the u-boot in Debian or mainline supports uEnv.txt for
> > the hummingboard variants. Or any of the variants supported in Debian's
> > u-boot package, though I haven't looked closely.
> > Try adding the following to /etc/flash-kernel/ubootenv.d/fdtfile:
> > setenv fdtfile imx6dl-hummingboard-spi.dtb
> > And running flash-kernel to regenerate the boot script.
> Thanks for your quick answer Vagrant.
> In case I try to boot a broken dtb (kernel does not boot), is there a way
> back to the previous dtb?
AFAIK there are two ways to tell the kernel where to find the device tree:
-> append to the kernel binary
-> the bootloader handles this during boot and makes it available for the
Can anybody tell, which method u-boot in Debian implements (in particular for
Can anybody tell, if it is possible to configure from u-boot shell to loada
custom device treefile?
Is that somewhere documented? The latest documentation on flash-kernelI found
is from 2011... https://wiki.debian.org/FlashKernelRework