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Diffstat (limited to 'docs/misc/arm/device-tree/booting.txt')
| -rw-r--r-- | docs/misc/arm/device-tree/booting.txt | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/docs/misc/arm/device-tree/booting.txt b/docs/misc/arm/device-tree/booting.txt index 94cd3f18a4..08ed775185 100644 --- a/docs/misc/arm/device-tree/booting.txt +++ b/docs/misc/arm/device-tree/booting.txt @@ -1,3 +1,6 @@ +Dom0 kernel and ramdisk modules +================================ + Xen is passed the dom0 kernel and initrd via a reference in the /chosen node of the device tree. @@ -22,4 +25,27 @@ properties: - bootargs (optional) - Command line associated with this module + Command line associated with this module. This is deprecated and should + be replaced by the bootargs variations described below. + + +Command lines +============= + +Xen also checks for properties directly under /chosen to find suitable command +lines for Xen and Dom0. The logic is the following: + + - If xen,xen-bootargs is present, it will be used for Xen. + - If xen,dom0-bootargs is present, it will be used for Dom0. + - If xen,xen-bootargs is _not_ present, but xen,dom0-bootargs is, + bootargs will be used for Xen. + - If no Xen specific properties are present, bootargs is for Dom0. + - If xen,xen-bootargs is present, but xen,dom0-bootargs is missing, + bootargs will be used for Dom0. + +Most of these cases is to make booting with Xen-unaware bootloaders easier. +For those you would hardcode the Xen commandline in the DTB under +/chosen/xen,xen-bootargs and would let the bootloader set the Dom0 command +line by writing bootargs (as for native Linux). +A Xen-aware bootloader would set xen,xen-bootargs for Xen, xen,dom0-bootargs +for Dom0 and bootargs for native Linux. |