On 04/05/2012 02:05 PM, Denys Dmytriyenko wrote: > On Thu, Apr 05, 2012 at 09:17:28PM +0100, Chris Tapp wrote: >> On 5 Apr 2012, at 21:10, Gary Thomas wrote: >> >>> On 2012-04-05 14:02, Chris Tapp wrote: >>>> Quite a few machine conf files specify the kernel26 machine feature. e.g., >>>> crownbay.conf has: >>>> >>>> MACHINE_FEATURES = "kernel26 screen keyboard pci usbhost ext2 ext3 x86 \ >>>> acpi serial usbgadget" >>>> >>>> What does this do? It's not listed at >>>> http://www.yoctoproject.org/docs/latest/poky-ref-manual/poky-ref-manual.html#ref-features-machine >>>> and seems to be at odds with: >>>> >>>> PREFERRED_PROVIDER_virtual/kernel ?= "linux-yocto" >>>> PREFERRED_VERSION_linux-yocto = "3.0%" >>> >>> I don't think it does anything any more. I'm pretty sure it used >>> to be used to select which style of kernel module utilities to >>> install (there was a change in kernel module format between 2.4 >>> and 2.6), but it seems that's gone now. At least in the Poky/Yocto >>> tree (oe-core + meta-yocto), there is no active use of this feature. > > Yes, Classic OE (unlike OE-Core) used to support 2.4 and 2.6 kernels, hence > the use flag. > >> Thanks, I was hoping it was something as simple as that. >> >> Another (possibly related) question - when the kernel built I noticed that >> linux_libc_headers_yocto-2.6.37 was 'mentioned' in the log output. Why was >> this used and not the headers for 3.0.18 ? The host is 2.6.32, so it doesn't >> look like is was for the tool chain. > > Those are "user-space" kernel headers for libc. Those usually don't need to > match the exact kernel version, as APIs don't change that often between the > kernel and user-space. Unless you need some specific new API that got added > in > the latest kernel... >
It's done this way to speed the build process as it uses a simple tarball download of the kernel sources to do this. Ultimately I believe we should build this package as part of the kernel build and PROVIDE it as well. -- Darren Hart Intel Open Source Technology Center Yocto Project - Linux Kernel _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto