# Distribution definition for: poky-tiny # # Copyright (c) 2011, Intel Corporation. # All rights reserved. # # This file is released under the MIT license as described in # ../meta/COPYING.MIT. # # Poky-tiny is intended to define a tiny Linux system comprised of a # Linux kernel tailored to support each specific MACHINE and busybox. # Poky-tiny sets some basic policy to ensure a usable system while still # keeping the rootfs and kernel image as small as possible. # # The policies defined are intended to meet the following goals: # o Serial consoles only (no framebuffer or VGA console) # o Basic support for IPV4 networking # o Single user ash shell # o Static images (no support for adding packages or libraries later) # o Read-only or RAMFS root filesystem # o Combined Linux kernel + rootfs in under 4MB # o Allow the user to select between eglibc or uclibc with the TCLIBC variable # # This is currently a partial definition, the following tasks remain: # [ ] Integrate linux-yocto-tiny ktype into linux-yocto # [ ] Define linux-yocto-tiny configs for all supported BSPs # [ ] Drop ldconfig from the installation # [ ] Modify the runqemu scripts to work with ext2 parameter: # runqemu qemux86 qemuparams="-nographic" bootparams="console=ttyS0,115200 root=0800" # [ ] Modify busybox to allow for DISTRO_FEATURES-like confiruration require conf/distro/poky.conf DISTRO = "poky-tiny" DISTROOVERRIDES = "poky:poky-tiny" TCLIBC = "musl" # FIXME: consider adding a new "tiny" feature #DISTRO_FEATURES_append = " tiny" # Distro config is evaluated after the machine config, so we have to explicitly # set the kernel provider to override a machine config. PREFERRED_PROVIDER_virtual/kernel = "linux-yocto-tiny" PREFERRED_VERSION_linux-yocto-tiny ?= "5.0%" # We can use packagegroup-core-boot, but in the future we may need a new packagegroup-core-tiny #POKY_DEFAULT_EXTRA_RDEPENDS += "packagegroup-core-boot" # Drop kernel-module-af-packet from RRECOMMENDS POKY_DEFAULT_EXTRA_RRECOMMENDS = "" # FIXME: what should we do with this? TCLIBCAPPEND = "" # Disable wide char support for ncurses as we don't include it in # in the LIBC features below. # Leave native enable to avoid build failures ENABLE_WIDEC = "false" ENABLE_WIDEC_class-native = "true" # Drop native language support. This removes the # eglibc->bash->gettext->libc-posix-clang-wchar dependency. USE_NLS="no" # Comment out any of the lines below to disable them in the build # DISTRO_FEATURES options: # alsa bluetooth ext2 pcmcia usbgadget usbhost wifi nfs zeroconf pci DISTRO_FEATURES_TINY = "pci" DISTRO_FEATURES_NET = "ipv4 ipv6" DISTRO_FEATURES_USB = "usbhost" #DISTRO_FEATURES_USBGADGET = "usbgadget" #DISTRO_FEATURES_WIFI = "wifi" DISTRO_FEATURES = "${DISTRO_FEATURES_TINY} \ ${DISTRO_FEATURES_NET} \ ${DISTRO_FEATURES_USB} \ ${DISTRO_FEATURES_USBGADGET} \ ${DISTRO_FEATURES_WIFI} \ " # Enable LFS - see bug YOCTO #5865 DISTRO_FEATURES_append_libc-uclibc = " largefile" DISTRO_FEATURES_append_libc-musl = " largefile" DISTRO_FEATURES_class-native = "${DISTRO_FEATURES_DEFAULT} ${POKY_DEFAULT_DISTRO_FEATURES}" DISTRO_FEATURES_class-nativesdk = "${DISTRO_FEATURES_DEFAULT} ${POKY_DEFAULT_DISTRO_FEATURES}" # enable mdev/busybox for init INIT_MANAGER ?= "mdev-busybox" # FIXME: Consider adding "modules" to MACHINE_FEATURES and using that in # packagegroup-core-base to select modutils-initscripts or not. Similar with "net" and # netbase. # By default we only support initramfs. We don't build live as that # pulls in a lot of dependencies for the live image and the installer, like # udev, grub, etc. These pull in gettext, which fails to build with wide # character support. IMAGE_FSTYPES = "cpio.gz" QB_DEFAULT_FSTYPE = "${IMAGE_FSTYPES}" # Drop v86d from qemu dependency list (we support serial) # Drop grub from meta-intel BSPs # FIXME: A different mechanism is needed here. We could define -tiny # variants of all compatible machines, but that leads to a lot # more machine configs to maintain long term. MACHINE_ESSENTIAL_EXTRA_RDEPENDS = "" # The mtrace script included by eglibc is a perl script. This means the system # will build perl in case this package is installed. Since we don't care about # this script for the purposes of tiny, remove the dependency from here. RDEPENDS_${PN}-mtrace_pn-eglibc = "" PNBLACKLIST[build-appliance-image] = "not buildable with poky-tiny" PNBLACKLIST[core-image-base] = "not buildable with poky-tiny" PNBLACKLIST[core-image-clutter] = "not buildable with poky-tiny" PNBLACKLIST[core-image-full-cmdline] = "not buildable with poky-tiny" PNBLACKLIST[core-image-rt] = "not buildable with poky-tiny" PNBLACKLIST[core-image-rt-sdk] = "not buildable with poky-tiny" PNBLACKLIST[core-image-sato] = "not buildable with poky-tiny" PNBLACKLIST[core-image-sato-dev] = "not buildable with poky-tiny" PNBLACKLIST[core-image-sato-sdk] = "not buildable with poky-tiny" PNBLACKLIST[core-image-x11] = "not buildable with poky-tiny" PNBLACKLIST[core-image-weston] = "not buildable with poky-tiny" # Disable python usage in opkg-utils since it won't build with tiny config PACKAGECONFIG_remove_pn-opkg-utils = "python"