On Tue, Nov 3, 2015 at 9:56 AM, Baptiste <[email protected]> wrote: > Hello, > > > > I’m using a BeagleBone as a base to develop a custom board. I’ve read pages > and pages of doc and I feel I need some highlights to make sense of it all. > Note that I’m mainly trying to understand the custom Linux distribution > workflow at the lowest level here, for instance to be able to recreate from > scratch the OE BeagleBoard stack… and I’m confused by all the available > resources. > > > So, here is my question spree to shed some light on these matters, not > necessarily specific to the BeagleBone but it's a great platform to > understand it all. Feel free to contribute even if you don’t have all the > answers. > > > I don’t understand why is the meta-beagleboard layer that huge. First, why > is it using the kernel 3.8 where the meta-ti layer supports 4.1? (is > meta-beagleboard depending on meta-ti in the first place, and if not, why? > There are references to the BB in the meta-ti tree, why is an other layer > even needed?) What's the difference with the layer meta-bbb?
"meta-beagleboard" has been 'un-maintained' for over a year now (actually 2 years..), consider it dead... > Then, why is recipes-kernel so full of all kind of patches? Where do those > come from, why does the kernel need so much patching? Then, if those patches > are here to “fix” the mainline kernel for the BB, what is exactly the > RobertCNelson/bb-kernel repo? And the beagleboard/linux repo? What’s the > relationship between all those projects? It depends on the branch... https://github.com/RobertCNelson/bb-kernel/tree/am33x-v3.8 -> beagleboard/linux (3.8) https://github.com/RobertCNelson/ti-linux-kernel-dev/tree/ti-linux-3.14.y -> beagleboard/linux (3.14) https://github.com/RobertCNelson/ti-linux-kernel-dev/tree/ti-linux-4.1.y -> beagleboard/linux (4.1) > Also, I’ve read the DeviceTree story, but it seems that the actual > BeagleBone DTS is in the kernel > (arch/arm/boot/dts/am335x-bone-common.dtsi)... yet I thought the whole point > of the DTS transition was not to add all ARM board files to the kernel. > Moreover, many mach-omap2/ and DTS files are patched in bb-kernel and in > meta-beagleboard... is it just because they’ve not been merged back to > mainline yet? Yet again, 3.8 was over two years ago.. Look again at the "v4.3.0" kernel.. > > When it comes to customizing the DTS, I’ve seen for instance a reference to > https://github.com/bradfa/beaglebone_pinmux_tables/blob/master/beaglebone_pins_p8 > or https://github.com/jadonk/bonescript/blob/master/src/bone.js to find out > the actual pin numbers. How are these files have even been generated? > > > I know I am mixing up different concepts here but they all coexist in the > different docs… so I thought I’d give it a try here. Some resources clearing > that up would be great too. Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
