# uboot-extlinux-config.bbclass
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#
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# This class allow the extlinux.conf generation for U-Boot use. The
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# U-Boot support for it is given to allow the Generic Distribution
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# Configuration specification use by OpenEmbedded-based products.
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#
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# External variables:
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#
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# UBOOT_EXTLINUX_CONSOLE - Set to "console=ttyX" to change kernel boot
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# default console.
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# UBOOT_EXTLINUX_LABELS - A list of targets for the automatic config.
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# UBOOT_EXTLINUX_KERNEL_ARGS - Add additional kernel arguments.
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# UBOOT_EXTLINUX_KERNEL_IMAGE - Kernel image name.
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# UBOOT_EXTLINUX_FDTDIR - Device tree directory.
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# UBOOT_EXTLINUX_FDT - Device tree file.
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# UBOOT_EXTLINUX_INITRD - Indicates a list of filesystem images to
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# concatenate and use as an initrd (optional).
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# UBOOT_EXTLINUX_MENU_DESCRIPTION - Name to use as description.
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# UBOOT_EXTLINUX_ROOT - Root kernel cmdline.
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# UBOOT_EXTLINUX_TIMEOUT - Timeout before DEFAULT selection is made.
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# Measured in 1/10 of a second.
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# UBOOT_EXTLINUX_DEFAULT_LABEL - Target to be selected by default after
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# the timeout period
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#
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# If there's only one label system will boot automatically and menu won't be
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# created. If you want to use more than one labels, e.g linux and alternate,
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# use overrides to set menu description, console and others variables.
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#
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# Ex:
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#
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# UBOOT_EXTLINUX_LABELS ??= "default fallback"
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#
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# UBOOT_EXTLINUX_DEFAULT_LABEL ??= "Linux Default"
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# UBOOT_EXTLINUX_TIMEOUT ??= "30"
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#
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# UBOOT_EXTLINUX_KERNEL_IMAGE_default ??= "../zImage"
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# UBOOT_EXTLINUX_MENU_DESCRIPTION_default ??= "Linux Default"
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#
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# UBOOT_EXTLINUX_KERNEL_IMAGE_fallback ??= "../zImage-fallback"
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# UBOOT_EXTLINUX_MENU_DESCRIPTION_fallback ??= "Linux Fallback"
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#
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# Results:
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#
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# menu title Select the boot mode
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# TIMEOUT 30
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# DEFAULT Linux Default
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# LABEL Linux Default
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# KERNEL ../zImage
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# FDTDIR ../
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# APPEND root=/dev/mmcblk2p2 rootwait rw console=${console}
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# LABEL Linux Fallback
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# KERNEL ../zImage-fallback
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# FDTDIR ../
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# APPEND root=/dev/mmcblk2p2 rootwait rw console=${console}
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#
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# Copyright (C) 2016, O.S. Systems Software LTDA. All Rights Reserved
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# Released under the MIT license (see packages/COPYING)
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#
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# The kernel has an internal default console, which you can override with
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# a console=...some_tty...
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UBOOT_EXTLINUX_CONSOLE ??= "console=${console},${baudrate}"
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UBOOT_EXTLINUX_LABELS ??= "linux"
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UBOOT_EXTLINUX_FDT ??= ""
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UBOOT_EXTLINUX_FDTDIR ??= "../"
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UBOOT_EXTLINUX_KERNEL_IMAGE ??= "../${KERNEL_IMAGETYPE}"
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UBOOT_EXTLINUX_KERNEL_ARGS ??= "rootwait rw"
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UBOOT_EXTLINUX_MENU_DESCRIPTION:linux ??= "${DISTRO_NAME}"
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UBOOT_EXTLINUX_CONFIG = "${B}/extlinux.conf"
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python do_create_extlinux_config() {
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if d.getVar("UBOOT_EXTLINUX") != "1":
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return
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if not d.getVar('WORKDIR'):
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bb.error("WORKDIR not defined, unable to package")
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labels = d.getVar('UBOOT_EXTLINUX_LABELS')
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if not labels:
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bb.fatal("UBOOT_EXTLINUX_LABELS not defined, nothing to do")
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if not labels.strip():
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bb.fatal("No labels, nothing to do")
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cfile = d.getVar('UBOOT_EXTLINUX_CONFIG')
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if not cfile:
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bb.fatal('Unable to read UBOOT_EXTLINUX_CONFIG')
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localdata = bb.data.createCopy(d)
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try:
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with open(cfile, 'w') as cfgfile:
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cfgfile.write('# Generic Distro Configuration file generated by OpenEmbedded\n')
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if len(labels.split()) > 1:
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cfgfile.write('menu title Select the boot mode\n')
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timeout = localdata.getVar('UBOOT_EXTLINUX_TIMEOUT')
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if timeout:
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cfgfile.write('TIMEOUT %s\n' % (timeout))
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if len(labels.split()) > 1:
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default = localdata.getVar('UBOOT_EXTLINUX_DEFAULT_LABEL')
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if default:
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cfgfile.write('DEFAULT %s\n' % (default))
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# Need to deconflict the labels with existing overrides
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label_overrides = labels.split()
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default_overrides = localdata.getVar('OVERRIDES').split(':')
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# We're keeping all the existing overrides that aren't used as a label
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# an override for that label will be added back in while we're processing that label
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keep_overrides = list(filter(lambda x: x not in label_overrides, default_overrides))
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for label in labels.split():
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localdata.setVar('OVERRIDES', ':'.join(keep_overrides + [label]))
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extlinux_console = localdata.getVar('UBOOT_EXTLINUX_CONSOLE')
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menu_description = localdata.getVar('UBOOT_EXTLINUX_MENU_DESCRIPTION')
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if not menu_description:
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menu_description = label
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root = localdata.getVar('UBOOT_EXTLINUX_ROOT')
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if not root:
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bb.fatal('UBOOT_EXTLINUX_ROOT not defined')
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kernel_image = localdata.getVar('UBOOT_EXTLINUX_KERNEL_IMAGE')
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fdtdir = localdata.getVar('UBOOT_EXTLINUX_FDTDIR')
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fdt = localdata.getVar('UBOOT_EXTLINUX_FDT')
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if fdt:
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cfgfile.write('LABEL %s\n\tKERNEL %s\n\tFDT %s\n' %
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(menu_description, kernel_image, fdt))
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elif fdtdir:
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cfgfile.write('LABEL %s\n\tKERNEL %s\n\tFDTDIR %s\n' %
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(menu_description, kernel_image, fdtdir))
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else:
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cfgfile.write('LABEL %s\n\tKERNEL %s\n' % (menu_description, kernel_image))
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kernel_args = localdata.getVar('UBOOT_EXTLINUX_KERNEL_ARGS')
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initrd = localdata.getVar('UBOOT_EXTLINUX_INITRD')
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if initrd:
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cfgfile.write('\tINITRD %s\n'% initrd)
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kernel_args = root + " " + kernel_args
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cfgfile.write('\tAPPEND %s %s\n' % (kernel_args, extlinux_console))
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except OSError:
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bb.fatal('Unable to open %s' % (cfile))
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}
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UBOOT_EXTLINUX_VARS = "CONSOLE MENU_DESCRIPTION ROOT KERNEL_IMAGE FDTDIR FDT KERNEL_ARGS INITRD"
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do_create_extlinux_config[vardeps] += "${@' '.join(['UBOOT_EXTLINUX_%s_%s' % (v, l) for v in d.getVar('UBOOT_EXTLINUX_VARS').split() for l in d.getVar('UBOOT_EXTLINUX_LABELS').split()])}"
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do_create_extlinux_config[vardepsexclude] += "OVERRIDES"
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addtask create_extlinux_config before do_install do_deploy after do_compile
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