1# Distribution definition for: poky-tiny 2# 3# Copyright (c) 2011, Intel Corporation. 4# All rights reserved. 5# 6# This file is released under the MIT license as described in 7# ../meta/COPYING.MIT. 8# 9# Poky-tiny is intended to define a tiny Linux system comprised of a 10# Linux kernel tailored to support each specific MACHINE and busybox. 11# Poky-tiny sets some basic policy to ensure a usable system while still 12# keeping the rootfs and kernel image as small as possible. 13# 14# The policies defined are intended to meet the following goals: 15# o Serial consoles only (no framebuffer or VGA console) 16# o Basic support for IPV4 networking 17# o Single user ash shell 18# o Static images (no support for adding packages or libraries later) 19# o Read-only or RAMFS root filesystem 20# o Combined Linux kernel + rootfs in under 4MB 21# o Allow the user to select between eglibc or uclibc with the TCLIBC variable 22# 23# This is currently a partial definition, the following tasks remain: 24# [ ] Integrate linux-yocto-tiny ktype into linux-yocto 25# [ ] Define linux-yocto-tiny configs for all supported BSPs 26# [ ] Drop ldconfig from the installation 27# [ ] Modify the runqemu scripts to work with ext2 parameter: 28# runqemu qemux86 qemuparams="-nographic" bootparams="console=ttyS0,115200 root=0800" 29# [ ] Modify busybox to allow for DISTRO_FEATURES-like configuration 30 31require conf/distro/poky.conf 32require conf/distro/include/gcsections.inc 33 34DISTRO = "poky-tiny" 35DISTROOVERRIDES = "poky:poky-tiny" 36TCLIBC = "musl" 37 38FULL_OPTIMIZATION="-Os -pipe ${DEBUG_FLAGS}" 39 40# FIXME: consider adding a new "tiny" feature 41#DISTRO_FEATURES_append = " tiny" 42 43# Distro config is evaluated after the machine config, so we have to explicitly 44# set the kernel provider to override a machine config. 45PREFERRED_PROVIDER_virtual/kernel = "linux-yocto-tiny" 46PREFERRED_VERSION_linux-yocto-tiny ?= "5.13%" 47 48# We can use packagegroup-core-boot, but in the future we may need a new packagegroup-core-tiny 49#POKY_DEFAULT_EXTRA_RDEPENDS += "packagegroup-core-boot" 50# Drop kernel-module-af-packet from RRECOMMENDS 51POKY_DEFAULT_EXTRA_RRECOMMENDS = "" 52 53# FIXME: what should we do with this? 54TCLIBCAPPEND = "" 55 56# Disable wide char support for ncurses as we don't include it in 57# in the LIBC features below. 58# Leave native enable to avoid build failures 59ENABLE_WIDEC = "false" 60ENABLE_WIDEC:class-native = "true" 61 62# Drop native language support. This removes the 63# eglibc->bash->gettext->libc-posix-clang-wchar dependency. 64USE_NLS="no" 65 66# Comment out any of the lines below to disable them in the build 67# DISTRO_FEATURES options: 68# alsa bluetooth ext2 pcmcia usbgadget usbhost wifi nfs zeroconf pci 69DISTRO_FEATURES_TINY = "pci" 70DISTRO_FEATURES_NET = "ipv4 ipv6" 71DISTRO_FEATURES_USB = "usbhost" 72#DISTRO_FEATURES_USBGADGET = "usbgadget" 73#DISTRO_FEATURES_WIFI = "wifi" 74 75DISTRO_FEATURES = "${DISTRO_FEATURES_TINY} \ 76 ${DISTRO_FEATURES_NET} \ 77 ${DISTRO_FEATURES_USB} \ 78 ${DISTRO_FEATURES_USBGADGET} \ 79 ${DISTRO_FEATURES_WIFI} \ 80 " 81 82# Enable LFS - see bug YOCTO #5865 83DISTRO_FEATURES:append:libc-musl = " largefile" 84 85DISTRO_FEATURES:class-native = "${DISTRO_FEATURES_DEFAULT} ${POKY_DEFAULT_DISTRO_FEATURES}" 86DISTRO_FEATURES:class-nativesdk = "${DISTRO_FEATURES_DEFAULT} ${POKY_DEFAULT_DISTRO_FEATURES}" 87 88# enable mdev/busybox for init 89INIT_MANAGER ?= "mdev-busybox" 90 91# FIXME: Consider adding "modules" to MACHINE_FEATURES and using that in 92# packagegroup-core-base to select modutils-initscripts or not. Similar with "net" and 93# netbase. 94 95# By default we only support initramfs. We don't build live as that 96# pulls in a lot of dependencies for the live image and the installer, like 97# udev, grub, etc. These pull in gettext, which fails to build with wide 98# character support. 99IMAGE_FSTYPES = "cpio.gz" 100 101QB_DEFAULT_FSTYPE = "${IMAGE_FSTYPES}" 102 103# Drop v86d from qemu dependency list (we support serial) 104# Drop grub from meta-intel BSPs 105# FIXME: A different mechanism is needed here. We could define -tiny 106# variants of all compatible machines, but that leads to a lot 107# more machine configs to maintain long term. 108MACHINE_ESSENTIAL_EXTRA_RDEPENDS = "" 109 110# The mtrace script included by eglibc is a perl script. This means the system 111# will build perl in case this package is installed. Since we don't care about 112# this script for the purposes of tiny, remove the dependency from here. 113RDEPENDS:${PN}-mtrace:pn-eglibc = "" 114 115PNBLACKLIST[build-appliance-image] = "not buildable with poky-tiny" 116PNBLACKLIST[core-image-base] = "not buildable with poky-tiny" 117PNBLACKLIST[core-image-full-cmdline] = "not buildable with poky-tiny" 118PNBLACKLIST[core-image-rt] = "not buildable with poky-tiny" 119PNBLACKLIST[core-image-rt-sdk] = "not buildable with poky-tiny" 120PNBLACKLIST[core-image-sato] = "not buildable with poky-tiny" 121PNBLACKLIST[core-image-sato-dev] = "not buildable with poky-tiny" 122PNBLACKLIST[core-image-sato-sdk] = "not buildable with poky-tiny" 123PNBLACKLIST[core-image-x11] = "not buildable with poky-tiny" 124PNBLACKLIST[core-image-weston] = "not buildable with poky-tiny" 125 126# Disable python usage in opkg-utils since it won't build with tiny config 127PACKAGECONFIG:remove:pn-opkg-utils = "python" 128