Hello, 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 kernel Can anybody tell, which method u-boot in Debian implements (in particular for the hummingboard)? 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 Thanks Rainer -- Rainer Dorsch http://bokomoko.de/
