Hi Michal, On Fri, 28 Feb 2020 at 04:03, Michal Simek <[email protected]> wrote: > > On 26. 02. 20 16:33, Simon Glass wrote: > > Hi Michal, > > > > On Tue, 18 Feb 2020 at 09:02, Michal Simek <[email protected]> wrote: > >> > >> Users have option to overwrite default device tree > >> (CONFIG_DEFAULT_DEVICE_TREE) via environment variable DEVICE_TREE. > >> > >> Feature has been added long time ago by commit 74de8c9a1672 > >> ("dts/Makefile: Build the user specified dts") for a little bit different > >> reason. > >> > >> But this variable can be also used for different purpose like choosing > >> proper configuration from FIT image in SPL. > >> And this is the functionality I would like to use on Xilinx Zynq devices > >> that current u-boot.img can be composed in the same way based on OF_LIST > >> and different configuration is taken based on platform specific SPL. > >> SPL requires low level ps7_init_gpl configuration that's why different > >> boards require different SPL with fixed board_fit_config_name_match(). > >> > >> Signed-off-by: Michal Simek <[email protected]> > >> --- > >> > >> I have done it in this way but maybe there is any smarter way how this can > >> be done. Also macro name can change if you want. > > > > Can you please add a bit of documentation to doc/README.fdt-control ? > > This feature is cover by documentation in this file already. What > exactly do you think that should be added? >
Then I suppose I am confused as to what this patch does. I thought it was allowing U-Boot to pass the DT to Linux, which wasn't previously supported? Regards, Simon > Thanks, > Michal > > 169 Build: > 170 > 171 After board configuration is done, fdt supported u-boot can be build > in two ways: > 172 1) build the default dts which is defined from > CONFIG_DEFAULT_DEVICE_TREE > 173 $ make > 174 2) build the user specified dts file > 175 $ make DEVICE_TREE=<dts-file-name> > 176 > 177 >
