**** BEGIN LOGGING AT Sun Jul 24 02:59:57 2022 Jul 24 09:40:39 does anyone happen to have a recommendation for a 5G USB dongle? Jul 24 21:31:02 Is beagleboard ai-64 available for order anywhere in the US? I cant find a single place its not soldout Jul 24 21:31:08 EU and SG seem to still have availablility Jul 24 22:29:20 Guest9782: should show up in another week or two... Jul 24 22:35:57 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? Jul 24 22:48:57 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 Jul 24 22:52:15 So U-Boot passes dtb to the kernel, so it's not necessary to modify the dts file in Linux kernel sources? Jul 24 22:54:02 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 Jul 24 22:54:56 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 Jul 24 22:56:13 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) Jul 24 22:57:22 in practice dtbs are kernel-version-specific to some degree which is why they're normally built and installed alongside the kernel itself Jul 24 23:04:09 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 :( Jul 24 23:04:40 that may require significant modification to board initialization in u-boot Jul 24 23:10:16 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. Jul 24 23:16:28 Also I need to enable config options for the new chip, I guess they are called CONFIG_DM_PMIC and CONFIG_DM_PMIC_TPS65910 Jul 24 23:30:13 if CONFIG_DM_PMIC wasn't already enabled then I don't know if you want to enable it Jul 24 23:31:32 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 Jul 24 23:31:56 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 Jul 24 23:33:50 Thank you, I'll look at the available configuration options carefully Jul 25 01:07:52 salt? Jul 25 01:09:15 Sorry. I read that incorrectly. Grains? Of salt. Crystals! Jul 25 01:10:02 @zmatt: What is the difference b/c a crystal and other type keepers? Jul 25 01:10:09 type = time Jul 25 01:10:48 the difference is that crystals are crystals, and other things that are not crystals are, in fact, not crystals Jul 25 01:10:54 Fine. Jul 25 01:11:05 Is an oscillator not a crystal. Jul 25 01:11:06 ? Jul 25 01:11:29 I keep reading where they are interchangeable but then they are not. Jul 25 01:11:29 an oscillator is anything that oscillates... a crystal can be used as part of an oscillator (the result being called a crystal oscillator) Jul 25 01:11:37 Aw. Jul 25 01:11:39 Okay. Jul 25 01:11:43 Thank you, kind sir. Jul 25 01:12:01 a crystal is literally just a piece of quartz crystal with transducers on it to convert between mechanical vibrations and electrical signals Jul 25 01:12:29 and the vibration of that crystal is used as source for timekeeping Jul 25 01:12:37 Aw. Jul 25 01:13:04 like a tuning fork making a tone Jul 25 01:13:12 Ding! Jul 25 01:13:26 in fact, some crystals are exactly tuning forks: https://en.wikipedia.org/wiki/File:32768_Hz_quartz_crystal_resonator.jpg Jul 25 01:13:35 Nice. Jul 25 01:14:01 radial resonance. Jul 25 01:14:27 Thwanggggg! Jul 25 01:15:00 Speaking of loud noises and oscillating quartz, what have you done lately w/ the BBB? Jul 25 01:15:21 I ask b/c I have done something silly lately. Jul 25 01:15:31 Sort of silly. But! Here goes it. Jul 25 01:15:35 I'm gonna have to cut you short, since I'm heading to bed Jul 25 01:15:41 Oh. Jul 25 01:15:43 Okay. Jul 25 01:15:49 No issue. Jul 25 01:16:01 g'night Jul 25 01:16:03 Chat another day to chat another day. **** ENDING LOGGING AT Mon Jul 25 02:59:56 2022