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# uboot-extlinux-config.bbclass
#
# This class allow the extlinux.conf generation for U-Boot use. The
# U-Boot support for it is given to allow the Generic Distribution
# Configuration specification use by OpenEmbedded-based products.
#
# External variables:
#
# UBOOT_EXTLINUX_CONSOLE - Set to "console=ttyX" to change kernel boot
# default console.
# UBOOT_EXTLINUX_LABELS - A list of targets for the automatic config.
# UBOOT_EXTLINUX_KERNEL_ARGS - Add additional kernel arguments.
# UBOOT_EXTLINUX_KERNEL_IMAGE - Kernel image name.
# UBOOT_EXTLINUX_FDTDIR - Device tree directory.
# UBOOT_EXTLINUX_INITRD - Indicates a list of filesystem images to
# concatenate and use as an initrd (optional).
# UBOOT_EXTLINUX_MENU_DESCRIPTION - Name to use as description.
# UBOOT_EXTLINUX_ROOT - Root kernel cmdline.
#
# If there's only one label system will boot automatically and menu won't be
# created. If you want to use more than one labels, e.g linux and alternate,
# use overrides to set menu description, console and others variables.
#
# Ex:
#
# UBOOT_EXTLINUX_LABELS ??= "default fallback"
#
# UBOOT_EXTLINUX_KERNEL_IMAGE_default ??= "../zImage"
# UBOOT_EXTLINUX_MENU_DESCRIPTION_default ??= "Linux Default"
#
# UBOOT_EXTLINUX_KERNEL_IMAGE_fallback ??= "../zImage-fallback"
# UBOOT_EXTLINUX_MENU_DESCRIPTION_fallback ??= "Linux Fallback"
#
# Results:
#
# menu title Select the boot mode
# LABEL Linux Default
# KERNEL ../zImage
# FDTDIR ../
# APPEND root=/dev/mmcblk2p2 rootwait rw console=${console}
# LABEL Linux Fallback
# KERNEL ../zImage-fallback
# FDTDIR ../
# APPEND root=/dev/mmcblk2p2 rootwait rw console=${console}
#
# Copyright (C) 2016, O.S. Systems Software LTDA. All Rights Reserved
# Released under the MIT license (see packages/COPYING)
#
# The kernel has an internal default console, which you can override with
# a console=...some_tty...
UBOOT_EXTLINUX_CONSOLE ??= "console=${console}"
UBOOT_EXTLINUX_LABELS ??= "linux"
UBOOT_EXTLINUX_FDTDIR ??= "../"
UBOOT_EXTLINUX_KERNEL_IMAGE ??= "../${KERNEL_IMAGETYPE}"
UBOOT_EXTLINUX_KERNEL_ARGS ??= "rootwait rw"
UBOOT_EXTLINUX_MENU_DESCRIPTION_linux ??= "${DISTRO_NAME}"
UBOOT_EXTLINUX_CONFIG = "${B}/extlinux.conf"
python create_extlinux_config() {
if d.getVar("UBOOT_EXTLINUX", True) != "1":
return
if not d.getVar('WORKDIR', True):
bb.error("WORKDIR not defined, unable to package")
labels = d.getVar('UBOOT_EXTLINUX_LABELS', True)
if not labels:
bb.fatal("UBOOT_EXTLINUX_LABELS not defined, nothing to do")
if not labels.strip():
bb.fatal("No labels, nothing to do")
cfile = d.getVar('UBOOT_EXTLINUX_CONFIG', True)
if not cfile:
bb.fatal('Unable to read UBOOT_EXTLINUX_CONFIG')
try:
with open(cfile, 'w') as cfgfile:
cfgfile.write('# Generic Distro Configuration file generated by OpenEmbedded\n')
if len(labels.split()) > 1:
cfgfile.write('menu title Select the boot mode\n')
for label in labels.split():
localdata = bb.data.createCopy(d)
overrides = localdata.getVar('OVERRIDES', True)
if not overrides:
bb.fatal('OVERRIDES not defined')
localdata.setVar('OVERRIDES', label + ':' + overrides)
bb.data.update_data(localdata)
extlinux_console = localdata.getVar('UBOOT_EXTLINUX_CONSOLE', True)
menu_description = localdata.getVar('UBOOT_EXTLINUX_MENU_DESCRIPTION', True)
if not menu_description:
menu_description = label
root = localdata.getVar('UBOOT_EXTLINUX_ROOT', True)
if not root:
bb.fatal('UBOOT_EXTLINUX_ROOT not defined')
kernel_image = localdata.getVar('UBOOT_EXTLINUX_KERNEL_IMAGE', True)
fdtdir = localdata.getVar('UBOOT_EXTLINUX_FDTDIR', True)
if fdtdir:
cfgfile.write('LABEL %s\n\tKERNEL %s\n\tFDTDIR %s\n' %
(menu_description, kernel_image, fdtdir))
else:
cfgfile.write('LABEL %s\n\tKERNEL %s\n' % (menu_description, kernel_image))
kernel_args = localdata.getVar('UBOOT_EXTLINUX_KERNEL_ARGS', True)
initrd = localdata.getVar('UBOOT_EXTLINUX_INITRD', True)
if initrd:
cfgfile.write('\tINITRD %s\n'% initrd)
kernel_args = root + " " + kernel_args
cfgfile.write('\tAPPEND %s %s\n' % (kernel_args, extlinux_console))
except OSError:
bb.fatal('Unable to open %s' % (cfile))
}
do_install[prefuncs] += "create_extlinux_config"
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