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# Standard definitions for any NSLU2 Linux kernel.
# Include this file in a .bb which specifies, at least,
# PN,PV,PR for the desired kernel
#
# Define the following *before* including this file as
# required:
#
# N2K_PATCHES - full list of patches to apply, to add files
# generate a patch against /dev/null
# N2K_SUFFIX - the suffix to add after 'zImage-' in the
# deploy/images directory, should identify the image config
#
# DEFAULT_PREFERENCE is set automagically in this file as
# follows:
#
# 10 For *released* kernels
# 8 For mm or ac patched versions of released kernels
# 6 For rc patched kernels (release candidates)
# 4 For mm or ac patched rc (release candidate) kernels
# 2 For pre or bk versions
# 0 For mm or ac patched pre or bk versions
#
# --------------------------------------------------------------
#
# Within this file bitbake variables local to the file are
# named N2K_FOO
#
SECTION = "kernel"
DESCRIPTION = "Linux kernel for the Linksys NSLU2 device"
LICENSE = "GPL"
DEPENDS += "devio-native"
# Linux kernel source has the general form linux-X.Y.Z-patchP,
# X.Y is the major version number, Z (which may have multiple
# parts) is a sub-version and 'patch' is something like 'mm' or
# 'ac' with a patch version. The original bz2 archive will be
# in a directory/file vX.Y/linux-X.Y.Z.tar.bz2. The unpacked
# source will be in the directory linux-X.Y.Z and this directory
# name corresponds to the module directory (in /lib/modules).
#
# The corresponding .bb file should be called:
#
# package_X.Y.Z-patchP
#
# Giving PN=package PV=X.Y.Z-patchP (and PR is set in the .bb
# file). Files, including the all important defconfig, are
# searched for in the following directories (last one first):
#
# nslu2-kernel/files
# nslu2-kernel/X.Y
# nslu2-kernel/X.Y.Z
# nslu2-kernel/X.Y.Z-patch
# nslu2-kernel/X.Y.Z-patchP
# package-X.Y.Z-patchP
#
# This allows sharing of patch files and other useful source!
# To share a file or patch with an earlier version put it in
# the shared directory - e.g. to use foo.patch on 2.6.11.2 and
# 2.6.11.4 it should be in directory nslu2-kernel/2.6.11.
#
# Note that when there are multiple patches the X.Y.Z-patch form
# uses base-patch (e.g. 2.6.12-mm) whereas X.Y.Z-patchP has the
# full form, for example 2.6.12-rc3-mm1 (in the same case).
#PN=package-name
#PV=package-version (full)
# The patch has the general form (rcN|preN|acN|mmN|bkN)* with the
# separate patch items being separated by '-' characters. The
# rc patch is first and has the important property that it
# requires the *preceding* kernel base version and that this
# will be the source directory name.
python () {
# The patches list may be empty. This code starts with the base
# kernel version and steps through the patches. Because the rc and
# pre patches actually require the *preceding* kernel version the code
# fixes that up appropriately.
pv = bb.data.getVar("PV",d,1).split('-')
kernel = pv[0].split('.')
base = pv[0]
name = [base]
major = '.'.join(name[0].split('.')[0:2])
minor = '.'.join(name[0].split('.')[0:3])
patch_uri = [ None ]
filedir = "${FILE_DIRNAME}/nslu2-kernel/%s"
# This entry will become the last one (everything is inserted before it)
filepath = [ filedir % "files" ]
pref = 10
mmac = 0
for patch in pv[1:]:
name.append(patch)
pname = '-'.join(name)
if patch[0:2] == "rc" or patch[0:3] == "pre":
patch_uri.append("${KERNELORG_MIRROR}/pub/linux/kernel/v%s/testing/patch-%s.bz2;patch=1;pname=%s" % (major, pname, pname))
kernel[-1] = str(int(kernel[-1]) - 1)
if patch[0:2] == "rc" and pref == 10:
pref = 6
filepath[0:0] = [ filedir % name[0] ]
filepath[0:0] = [ filedir % (name[0] + "-rc") ]
else:
pref = 2
elif patch[0:2] == "bk" or patch[0:3] == "git":
patch_uri.append("${KERNELORG_MIRROR}/pub/linux/kernel/v%s/snapshots/patch-%s.bz2;patch=1;pname=%s" % (major, pname, pname))
pref = 2
elif patch[0:2] == "ac":
patch_uri.append("${KERNELORG_MIRROR}/pub/linux/kernel/people/alan/linux-%s/%s/patch-%s" % (major, base, pname))
mmac = 2
filepath[0:0] = [ filedir % (name[0] + "-ac") ]
elif patch[0:2] == "mm":
patch_uri.append("${KERNELORG_MIRROR}/pub/linux/kernel/people/akpm/patches/%s/%s/%s/%s.bz2;patch=1;pname=%s" % (major, base, pname, pname, pname))
mmac = 2
filepath[0:0] = [ filedir % (name[0] + "-mm") ]
else:
raise bb.build.FuncFailed("nslu2-kernel: patch %s not recognized in %s" % (patch, '-'.join(pv)))
filepath[0:0] = [ filedir % pname ]
base = pname
base = '.'.join(kernel)
patch_uri[0] = "${KERNELORG_MIRROR}/pub/linux/kernel/v%s/linux-%s.tar.bz2" % (major, base)
filepath[-1:-1] = [ filedir % base ]
if base != minor:
filepath[-1:-1] = [ filedir % minor ]
filepath[-1:-1] = [ filedir % major ]
bb.data.setVar("N2K_SRCMAJ", major, d)
# bb.note("N2K_SRCMAJ := %s" % major)
bb.data.setVar("N2K_SRCVER", base, d)
# bb.note("N2K_SRCVER := %s" % base)
bb.data.setVar("N2K_SRCURI", ' '.join(patch_uri), d)
# bb.note("N2K_SRCURI := %s" % ' '.join(patch_uri))
bb.data.setVar("N2K_FILESPATH", ':'.join(filepath), d)
# bb.note("N2K_FILESPATH := %s" % ' '.join(filepath))
bb.data.setVar("DEFAULT_PREFERENCE", pref-mmac, d)
# bb.note("DEFAULT_PREFERENCE := %s" % (pref-mmac))
}
# FILESPATH: this list is in order last-searched-first, therefore
# the first entry is the *latest* and/or most specific
FILESPATH = "${FILE_DIRNAME}/${P}:${N2K_FILESPATH}"
# The working directory will be the 'base' version (which may not be the
# same as implied by the PV variable because it corresponds to the prior
# minor version for rc and pre patched versions).
S = "${WORKDIR}/linux-${N2K_SRCVER}"
# N2K_PATCHES is the list of patches.
N2K_PATCHES ?= ""
# Image suffix - actually set in conf/machine/nslu2.conf as it is also
# used by anything which needs to know the name of the generated image.
# Should be overridden in the distro if patches or defconfig are changed.
N2K_SUFFIX ?= "nslu2${SITEINFO_ENDIANESS}"
SRC_URI = "${N2K_SRCURI}"
SRC_URI += "${N2K_PATCHES}"
SRC_URI += "file://defconfig"
COMPATIBLE_HOST = 'arm.*-linux'
inherit kernel
ARCH = "arm"
KERNEL_IMAGETYPE = "zImage"
# To specify the console set KERNEL_CONSOLE in the .bb file.
# CMDLINE_ROOT contains the boot options, CMDLINE_KERNEL_OPTIONS
# contains the things for a specific kernel.
CMDLINE_KERNEL_OPTIONS ?= "reboot=s"
CMDLINE_ROOT ?= "root=/dev/mtdblock4 rw rootfstype=jffs2 mem=32M@0x00000000 init=/linuxrc"
# Add distro specific debug (or non-debug) options to this
CMDLINE_DEBUG ?= ""
CMDLINE = "${CMDLINE_ROOT} ${CMDLINE_KERNEL_OPTIONS} ${CMDLINE_DEBUG} ${CMDLINE_CONSOLE}"
# Set EXTRAVERSION and LOCALVERSION to "" so that the kernel version
# remains pinned to the x.y.z form, also turn off the directory
# printing which provides almost all the output of an incremental build.
EXTRA_OEMAKE += "EXTRAVERSION="
EXTRA_OEMAKE += "LOCALVERSION="
EXTRA_OEMAKE += "MAKEFLAGS='--no-print-directory'"
addtask unpacklocal before do_patch after do_unpack
# NOTE: in MM kernel builds the config options (oldconfig, menuconfig
# and so on) do not allow an option to be overridden, so the following
# removes the options which must be changed.
do_configure_prepend() {
rm -f ${S}/.config
echo "CONFIG_CMDLINE=\"${CMDLINE}\"" >>'${S}/.config'
if test '${SITEINFO_ENDIANESS}' = be
then
echo 'CONFIG_CPU_BIG_ENDIAN=y' >>'${S}/.config'
fi
if test '${SLUGOS_IMAGESEX}' = big-endian
then
echo 'CONFIG_JFFS2_BIG_ENDIAN=y' >>'${S}/.config'
fi
if test '${SLUGOS_IMAGESEX}' = little-endian
then
echo 'CONFIG_JFFS2_LITTLE_ENDIAN=y' >>'${S}/.config'
fi
sed -e '/CONFIG_CPU_BIG_ENDIAN/d' -e '/CONFIG_CMDLINE=/d' \
-e '/CONFIG_JFFS2_NATIVE_ENDIAN=/d' \
-e '/CONFIG_JFFS2_BIG_ENDIAN=/d' \
-e '/CONFIG_JFFS2_LITTLE_ENDIAN=/d' \
'${WORKDIR}/defconfig' >>'${S}/.config'
rm -rf ${S}/include/asm-arm/arch ${S}/include/asm-arm/proc \
${S}/include/asm-arm/.proc ${S}/include/asm-arm/.arch
}
# This function adds the required prefix to the image to deal with two
# problems:
#
# 1) The machine type set by RedBoot is wrong - the type for an ixdp425, not an NSLU2
# e3a01c02 e3811055
# 2) For LE kernels it is necessary to prefix change-to-le code to the kernel image:
# ee110f10 e3c00080 ee010f10
# and to byte swap the (LE) image to match the BE flash layout
#
# The argument to the function is the destination directory
redboot_fixup_armeb() {
rm -f "$1".new
devio '<<arch/${ARCH}/boot/${KERNEL_IMAGETYPE}' >"$1".new \
'wb 0xe3a01c02,4' \
'wb 0xe3811055,4' \
'cp$'
mv "$1".new "$1"
}
redboot_fixup_arm() {
rm -f "$1".new
devio '<<arch/${ARCH}/boot/${KERNEL_IMAGETYPE}' >"$1".new \
'wb 0xe3a01c02,4' \
'wb 0xe3811055,4' \
'wb 0xee110f10,4' \
'wb 0xe3c00080,4' \
'wb 0xee010f10,4' \
'xp $,4' || {
echo 'ERROR: arch/${ARCH}/boot/${KERNEL_IMAGETYPE}: failed to byteswap zImage' >&2
return 1
}
mv "$1".new "$1"
}
do_install_append() {
redboot_fixup '${STAGING_KERNEL_DIR}/${KERNEL_IMAGETYPE}'
}
do_deploy[dirs] = "${S}"
do_deploy() {
install -d ${DEPLOY_DIR_IMAGE}
redboot_fixup '${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}-${N2K_SUFFIX}'
}
addtask deploy before do_build after do_compile
COMPATIBLE_MACHINE = "nslu2"
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