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