Hi Michal,
On Fri, 28 Feb 2020 at 04:03, Michal Simek michal.simek@xilinx.com wrote:
On 26. 02. 20 16:33, Simon Glass wrote:
Hi Michal,
On Tue, 18 Feb 2020 at 09:02, Michal Simek michal.simek@xilinx.com 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 michal.simek@xilinx.com
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