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Michal Orzel
ddcc208ccd
Some time ago, Linux switched the format of docs to ReST and the format of device-tree bindings to json-schema. Signed-off-by: Michal Orzel <michal.orzel@amd.com> Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com> Release-acked-by: Henry Wang <Henry.Wang@arm.com>
42 lines
1.4 KiB
Plaintext
42 lines
1.4 KiB
Plaintext
Booting Xen
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===========
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Xen follows the zImage protocol defined for 32-bit ARM Linux[1] and the
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Image protocol defined for ARM64 Linux[2].
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In both cases the recommendation to boot in HYP/EL2 mode is a strict
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requirement for Xen.
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The exceptions to this on 32-bit ARM are as follows:
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Xen does not require the machine type to be passed in r1. This
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register is ignored (so may be invalid or the actual machine type).
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Xen does not support the ATAG list and requires Device
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Tree. Therefore r2 must point to the physical address of device tree
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block (dtb) in system RAM.
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NOTE: although Xen uses the zImage protocol there is no compression
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actually used. This should be transparent to the bootloader. The
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zImage protocol should still be used and not the stricter "raw
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(non-zImage)" protocol described in arm/Booting.
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There are no exception on 64-bit ARM.
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Firmware/bootloader requirements
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--------------------------------
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Xen relies on some settings the firmware has to configure in EL3 before starting Xen.
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* Xen must be entered in NS EL2 mode
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* The bit SCR_EL3.HCE (resp. SCR.HCE for 32-bit ARM) must be set to 1.
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[1] linux/Documentation/arm/booting.rst
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Latest version: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/arm/booting.rst
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[2] linux/Documentation/arm64/booting.rst
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Latest version: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/arm64/booting.rst
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