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Ian Campbell
af82a77f3a
It is the compatible string which matters, not the absolute path, and in any case /chosen/module@N is more often used than /chosen/modules/module@N. Reported-by: Fu Wei <fu.wei@linaro.org> Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Julien Grall <julien.gral@linaro.org>
53 lines
1.6 KiB
Plaintext
53 lines
1.6 KiB
Plaintext
Dom0 kernel and ramdisk modules
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================================
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Xen is passed the dom0 kernel and initrd via a reference in the /chosen
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node of the device tree.
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Each node contains the following properties:
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- compatible
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Must be:
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"xen,<type>", "xen,multiboot-module"
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where <type> must be one of:
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- "linux-zimage" -- the dom0 kernel
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- "linux-initrd" -- the dom0 ramdisk
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- reg
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Specifies the physical address of the module in RAM and the
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length of the module.
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- bootargs (optional)
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Command line associated with this module. This is deprecated and should
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be replaced by the bootargs variations described below.
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Command lines
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=============
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Xen also checks for properties directly under /chosen to find suitable command
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lines for Xen and Dom0. The logic is the following:
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- If xen,xen-bootargs is present, it will be used for Xen.
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- If xen,dom0-bootargs is present, it will be used for Dom0.
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- If xen,xen-bootargs is _not_ present, but xen,dom0-bootargs is,
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bootargs will be used for Xen.
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- If a kernel boot module is present and has a bootargs property then
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the top-level bootargs will used for Xen.
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- If no Xen specific properties are present, bootargs is for Dom0.
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- If xen,xen-bootargs is present, but xen,dom0-bootargs is missing,
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bootargs will be used for Dom0.
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Most of these cases is to make booting with Xen-unaware bootloaders easier.
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For those you would hardcode the Xen commandline in the DTB under
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/chosen/xen,xen-bootargs and would let the bootloader set the Dom0 command
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line by writing bootargs (as for native Linux).
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A Xen-aware bootloader would set xen,xen-bootargs for Xen, xen,dom0-bootargs
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for Dom0 and bootargs for native Linux.
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