On 01. 04. 20 20:09, Mark Kettenis wrote: >> From: Michal Simek <michal.simek@xxxxxxxxxx> >> Date: Wed, 1 Apr 2020 11:23:13 +0200 >> >> Hi Rob and others, >> >> for couple of years already u-boot is using config node in root DT for >> u-boot configuration. >> >> Here is one example in u-boot source code. >> https://gitlab.denx.de/u-boot/u-boot/-/blob/master/arch/arm/dts/exynos5250-spring.dts#L47 >> >> And here is dt binding description >> https://gitlab.denx.de/u-boot/u-boot/-/blob/master/doc/device-tree-bindings/config.txt >> >> I was checking dt binding specification and there no such a thing >> described there. It means I expect this is more adhoc u-boot solution. >> We have reached the point where could be beneficial to put some u-boot >> specific configurations to DT. >> >> Actually I have done similar thing some time ago too by using chosen >> node and add xilinx specific property there to point to eeprom. >> https://gitlab.denx.de/u-boot/u-boot/-/blob/master/arch/arm/dts/zynqmp-zcu102-revA.dts#L39 >> >> I think it is a time to discuss it and do it properly. >> >> First of all my question is where we could list SW prefixes to make sure >> that they are listed and everybody is aware about it. We have >> vendor-prefixes and we should have a way to record also prefixes for sw >> projects. U-Boot is using u-boot. Xen has file in the kernel with using >> xen prefix. At least these two should be listed. > > OpenBSD is using "openbsd," as a prefix. I've always thought it would > be good to have it listed in the list of vendor prefixes there. In an > open source world it shouldn't matter whether an entity sells > something or not. And in fact "inux," is already there. And so is > "qemu,". Good we have more. > >> Next my question is what is the recommended way to pass sw specific >> parameters via DT? I think using chosen node is more appropriate then >> adhoc config node. Or is there a better way how this should be done? > > On OpenBSD we do indeed use the the chosen node to pass information > between the bootloader and the kernel. Can you please point me to any example or description what you are adding there? Thanks, Michal
