08:40 <pagnol> does anyone happen to have a recommendation for a 5G USB dongle?

20:31 <Guest9782> Is beagleboard ai-64 available for order anywhere in the US? I cant find a single place its not soldout

20:31 <Guest9782> EU and SG seem to still have availablility

21:29 <rcn-ee> Guest9782: should show up in another week or two...

21:35 <azarubkin> Hi everyone, I have a question regarding device tree modification. Is it enough to modify it in U-Boot sources, or I should make similar changes in the Linux kernel sources?

21:48 <zmatt> azarubkin: regardless of how you build it, you need to ensure u-boot passes a dtb to the kernel that's correct for your board

21:52 <azarubkin> So U-Boot passes dtb to the kernel, so it's not necessary to modify the dts file in Linux kernel sources?

21:54 <zmatt> typically the kernel source tree is where the dts resides to be build and installed alongside the kernel (unless you build and install it separately), then u-boot loads it from the filesystem and passes it to the loaded kernel

21:54 <zmatt> I know recent u-boot versions also does something with embedded dtbs or something but I don't really know anything about it, I've not really worked with any such u-boot versions

21:56 <zmatt> most information in the dtb is irrelevant to u-boot, it only needs to perform some board-specific initialization (and it needs to do so before it can load the dtb, so the dtb can't really be used by u-boot as a source of useful information)

21:57 <zmatt> in practice dtbs are kernel-version-specific to some degree which is why they're normally built and installed alongside the kernel itself

22:04 <azarubkin> Thank you. I'm trying to get my head around all the U-Boot, device tree & Linux kernel stuff, trying to modify the original setup for a custom board with TPS65910 instead of TPS65217 PMIC :(

22:04 <zmatt> that may require significant modification to board initialization in u-boot

22:10 <azarubkin> I'm looking into it. There are two functions - `scale_vcores_bone` dealing with TPS65217 and `scale_vcores_generic` dealing with TPS65910. I guess I should make U-Boot call the latter.

22:16 <azarubkin> Also I need to enable config options for the new chip, I guess they are called CONFIG_DM_PMIC and CONFIG_DM_PMIC_TPS65910

22:30 <zmatt> if CONFIG_DM_PMIC wasn't already enabled then I don't know if you want to enable it

22:31 <zmatt> CONFIG_DM_* stuff is the new "device model" which iirc is different from the older way of doing board initialization, so changing something from non-DM to DM presumably means further changes are required

22:31 <zmatt> but it's been ages since I've done anything with u-boot, and mostly pre-DM, so anything I say here should be taken with a grain of salt

22:33 <azarubkin> Thank you, I'll look at the available configuration options carefully