On Sun, 10 Aug 2014 18:22:41 +0400 Reco <recovery...@gmail.com> wrote:
> Hi. > > On Sun, 10 Aug 2014 17:09:58 +0300 > Martin T <m4rtn...@gmail.com> wrote: > > > Reco, > > > > thanks for this explanation! Could you please explain this hardware > > enumeration provided by x86/x86-64 CPU's to kernel bit more? What kind > > of information is provided to kernel in case of x86/x86-64 CPU? > > Sure: > > 1) Obtain any x86 hardware. > > 2) Boot Linux. > > 3) Run lspci. Observe a non-empty result, which will probably include > SATA, Ethernet, USB, Memory controllers and probably much more. > > 4) Repeat steps 1-3 with any ARM board (assuming successful boot, of > course). Observe exactly one line that says (in my case, and that's > good one, usually there's nothing at all): > > 00:00.0 Host bridge: Marvell Technology Group Ltd. 88F6281 [Kirkwood] > ARM SoC (rev 03) > > And that particular hardware has at least Memory, Ethernet, 4-port > SATA controller and USB. > > > That's they mean then they talk about hardware enumeration - it's all > there yet ARM platform has no means to discover it or to tell Linux > kernel its there. > > So, you count the hardware, produce device tree, compile it into the > kernel - and you can work with said hardware. > > You have a different set of hardware - you'll need a different device > tree. And that means a different kernel. Thanks for this explanation. I also run Debian on a Kirkwood platform (a Seagate GoFlex Net (STAK100)) (in addition to my x86 hardware), and I kept seeing all this talk about flattened device trees, and was aware of the need for special kernels, but I never really understood why ... http://forum.doozan.com/read.php?2,12096,12096 Now, I'm still not sure about the difference between flattened and non-flattened trees, and what they're relative advantages and disadvantages are ... Celejar -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20140810141453.683129494fbf5545a64d8...@gmail.com
