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#@TYPE: Machine configuration
#@NAME: ixp4xx
#@DESCRIPTION: genric machine configuration for ixp4xx platforms
#-------------------------------------------------------------------------------
# INPUTS
#-------------------------------------------------------------------------------
# conf/${DISTRO}.conf is included after this file and should be used to modify
# variables identified as 'INPUTS' to the required values for the DISTRO, this
# will cause the board specific settings (which depend for the most part on the
# exact CPU used) to be set correctly within this file. The results are the
# variables identifies here as 'OUTPUTS'
#
#variable = "default"
# <possible values>
# description
ARCH_BYTE_SEX = "be"
# "be" "le"
# The memory byte sex and (on correctly implemented hardware - the IXP4XX is
# correct) the byte sex of the buses within the system. 'be' (big-endian)
# means that the first byte is the most significant byte on a bus, 'le'
# (little-endian) means that the first byte is the least significant byte.
ARM_INSTRUCTION_SET = "arm"
# "arm" "thumb"
# The instruction set the compiler should use when generating application
# code. The kernel is always compiled with arm code at present. arm code
# is the original 32 bit ARM instruction set, thumb code is the 16 bit
# encoded RISC sub-set. Thumb code is smaller (maybe 70% of the ARM size)
# but requires more instructions (140% for 70% smaller code) so may be
# slower.
THUMB_INTERWORK = "yes"
# "yes" "no"
# Whether to compile with code to allow interworking between the two
# instruction sets. This allows thumb code to be executed on a primarily
# arm system and vice versa. It is strongly recommended that DISTROs not
# turn this off - the actual cost is very small.
DISTRO_BASE = ""
# "" ":<base>"
# If given this must be the name of a 'distro' to add to the bitbake OVERRIDES
# after ${DISTRO}, this allows different distros to share a common base of
# overrides. The value given must include a leading ':' or chaos will result.
IXP4XX_SUFFIX = "${MACHINE_ARCH}"
# <string>
# Kernel suffix - 'ixp4xxbe' or 'ixp4xxle' for a truely generic image, controls
# the suffix on the name of the generated zImage, override in the DISTRO
# configuration if patches or defconfig are changed for the DISTRO.
#-------------------------------------------------------------------------------
# OUTPUTS
#-------------------------------------------------------------------------------
#OVERRIDES
# The standard ':' separated list of overrides used by bitbake - see the
# basic setting in bitbake.conf. This list is based on that used for the
# standard setting however :<base>, :thumb and :thumb-interwork will be
# inserted at appropriate points if a base distro, default use of thumb or
# arm/thumb interworking are enabled in the inputs.
OVERRIDE_THUMB = "${@['', ':thumb'][bb.data.getVar('ARM_INSTRUCTION_SET', d, 1) == 'thumb']}"
OVERRIDE_INTERWORK = "${@['', ':thumb-interwork'][bb.data.getVar('THUMB_INTERWORK', d, 1) == 'yes']}"
OVERRIDES = "local:${MACHINE}:ixp4xx:${DISTRO}${DISTRO_BASE}:${TARGET_OS}:${TARGET_ARCH}${OVERRIDE_THUMB}${OVERRIDE_INTERWORK}:build-${BUILD_OS}:fail-fast"
# TARGET_CC_ARCH
# TARGET_CC_KERNEL_ARCH
# TARGET_LD_ARCH
# TARGET_LD_KERNEL_ARCH
# Compiler and linker options for application code and kernel code. These
# options ensure that the compiler has the correct settings for the selected
# instruction set and interworking.
ARM_INTERWORK_M_OPT = "${@['-mno-thumb-interwork', '-mthumb-interwork'][bb.data.getVar('THUMB_INTERWORK', d, 1) == 'yes']}"
ARM_THUMB_M_OPT = "${@['-mno-thumb', '-mthumb'][bb.data.getVar('ARM_INSTRUCTION_SET', d, 1) == 'thumb']}"
#
TARGET_CC_ARCH = "-march=armv5te -mtune=xscale ${ARM_INTERWORK_M_OPT} ${ARM_THUMB_M_OPT}"
TARGET_CC_KERNEL_ARCH = "-march=armv5te -mtune=xscale -mno-thumb-interwork -mno-thumb"
TARGET_LD_ARCH = ""
TARGET_LD_KERNEL_ARCH = ""
# FULL_OPTIMIZATION
# Optimization settings. Os works fine and is significantly better than O2.
# The other settings are somewhat arbitrary. The optimisations chosen here
# include the ones which 'break' symbolic debugging (because the compiler does
# not include enough information to allow the debugger to know where given
# values are.) The -fno options are an attempt to cancel explicit use of space
# consuming options found in some packages (this isn't a complete list, this is
# just the ones which package writers seem to know about and abuse).
FULL_OPTIMIZATION = "-Os -fomit-frame-pointer -frename-registers \
-fno-unroll-loops -fno-inline-functions \
-fweb -funit-at-a-time"
# TARGET_ARCH
# The correct setting for the system endianness (ARCH_BYTE_SEX). This will
# be arm (le) or armeb (be) - it is difficult to be more precise in the
# setting because of the large number of ways it is used within OpenEmbedded.
TARGET_ARCH = "${@['armeb', 'arm'][bb.data.getVar('ARCH_BYTE_SEX', d, 1) == 'le']}"
# TARGET_PACKAGE_ARCH [not used]
# The correct setting for the generated packages. This corresponds to the
# -march flag passed to the compiler because that limits the architectures
# on which the generated code will run.
BYTE_SEX_CHAR = "${@['b', 'l'][bb.data.getVar('ARCH_BYTE_SEX', d, 1) == 'le']}"
TARGET_PACKAGE_ARCH_BASE = "${@['armv5te', 'thumbv5t'][bb.data.getVar('ARM_INSTRUCTION_SET', d, 1) == 'thumb']}"
TARGET_PACKAGE_ARCH = "${TARGET_PACKAGE_ARCH_BASE}${BYTE_SEX_CHAR}"
# MACHINE_ARCH
# The correct setting for packages which are specific to the machine, this
# defaults to ${MACHINE} in bitbake.conf, however it is set to ixp4xx here
# because everything built here is no more specific than that.
MACHINE_ARCH = "ixp4xx${ARCH_BYTE_SEX}"
# PACKAGE_EXTRA_ARCHS
# The full list of package architectures which should run on the system.
# This takes into account both the board level issues and the INPUTS set
# by the distro. The arm list is derived from the architecture settings
# known to gcc, the thumb list is then derived from that (only the 't'
# architectures of course).
#[not used]: TARGET_ARCH is handled below because it is also currently
# used for thumb packages.
#ARM_ARCHITECTURES = "${TARGET_ARCH} armv2${BYTE_SEX_CHAR} armv2a${BYTE_SEX_CHAR} armv3${BYTE_SEX_CHAR} armv3m${BYTE_SEX_CHAR} armv4${BYTE_SEX_CHAR} armv4t${BYTE_SEX_CHAR} armv5${BYTE_SEX_CHAR} armv5t${BYTE_SEX_CHAR} armv5e${BYTE_SEX_CHAR} armv5te${BYTE_SEX_CHAR} xscale${BYTE_SEX_CHAR}"
ARM_ARCHITECTURES = "armv2${BYTE_SEX_CHAR} armv2a${BYTE_SEX_CHAR} armv3${BYTE_SEX_CHAR} armv3m${BYTE_SEX_CHAR} armv4${BYTE_SEX_CHAR} armv4t${BYTE_SEX_CHAR} armv5${BYTE_SEX_CHAR} armv5t${BYTE_SEX_CHAR} armv5e${BYTE_SEX_CHAR} armv5te${BYTE_SEX_CHAR} xscale${BYTE_SEX_CHAR}"
THUMB_ARCHITECTURES = "thumbe${BYTE_SEX_CHAR} thumbv4t${BYTE_SEX_CHAR} thumbv5t${BYTE_SEX_CHAR}"
# NOTE: this list contains just the things which rootfs_ipk.bbclass does
# not add, rootfs_ipk.bbclass evaluates:
#
# ipkgarchs="all any noarch ${TARGET_ARCH} ${PACKAGE_EXTRA_ARCHS} ${MACHINE}"
#
# This is a priority ordered list - most desireable architecture at the end,
# so put <ARM_INSTRUCTION_SET>_ARCHITECTURES at the end and, if
# THUMB_INTERWORK precede this with the other architectures.
PACKAGE_EXTRA_ARCHS = "ixp4xx ${MACHINE} \
${@(lambda arch_thumb, arch_arm, is_arm, interwork: \
(interwork and (is_arm and arch_thumb or arch_arm) + ' ' or '') \
+ '${TARGET_ARCH} ' + (is_arm and arch_arm or arch_thumb)) \
(bb.data.getVar('THUMB_ARCHITECTURES', d, 1), \
bb.data.getVar('ARM_ARCHITECTURES', d, 1), \
bb.data.getVar('ARM_INSTRUCTION_SET', d, 1) != 'thumb', \
bb.data.getVar('THUMB_INTERWORK', d, 1) == 'yes')} \
${MACHINE_ARCH} ${MACHINE}${ARCH_BYTE_SEX}"
# IPKG_ARCH_LIST [not used]
# This is used to override the ipkgarchs settings in rootfs_ipk.bbclass, allowing
# the removal of the raw "${MACHINE}" from the end of the list. ${MACHINE} and
# ixp4xx are included at the start (lower priority) as the non-byte-sex specific
# versions.
IPKG_ARCH_LIST = "all any noarch ixp4xx ${MACHINE} ${PACKAGE_EXTRA_ARCHS}"
#-------------------------------------------------------------------------------
# Board defaults
#-------------------------------------------------------------------------------
# These values are board specific but they seem to be common to a large number
# of boards so are reasonable defaults.
SERIAL_CONSOLE = "115200 ttyS0"
KERNEL_CONSOLE = "ttyS0,115200n8"
USE_VT = "0"
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