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authorFabio Berton <fabio.berton@ossystems.com.br>2016-10-04 10:54:10 -0300
committerRichard Purdie <richard.purdie@linuxfoundation.org>2016-10-07 16:43:50 +0100
commit7c18abeb2a6ef8b7bb53aa92a9ee76bd465fada2 (patch)
tree52a416cb93cd948d254b4e77b4c4a2356032130a
parent8b18568591f66aa9770798bc61123898de92b8a9 (diff)
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classes/uboot-extlinux-config: Add class
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. This class can be inherited by u-boot recipes to create extlinux.conf and boot using menu options. U-boot with extlinux support is machine dependent, so to use this class you need to set UBOOT_EXTLINUX to 1 in machine configuration file and also set root= kernel cmdline UBOOT_EXTLINUX_ROOT. This variable is used to pass root kernel cmdline, e.g: UBOOT_EXTLINUX_ROOT = "root=/dev/mmcblk2p2" Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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diff --git a/meta/classes/uboot-extlinux-config.bbclass b/meta/classes/uboot-extlinux-config.bbclass
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+++ b/meta/classes/uboot-extlinux-config.bbclass
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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"