Re: [Xen-devel] [PATCH v3] xen: arm: doc: Add firmware requirements

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Mon, 25 Apr 2016, Dirk Behme wrote:
> From: Dirk Behme <dirk.behme@xxxxxxxxxxxx>
> 
> Add a section about what the firmware should do in EL3 before starting Xen.
> 
> E.g guest will use HVC instruction to issue hypercall. As this can be set only
> at EL3, i.e. outside Xen, document this boot requirement.
> 
> Signed-off-by: Dirk Behme <dirk.behme@xxxxxxxxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

Added to me queue


>  docs/misc/arm/booting.txt | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/docs/misc/arm/booting.txt b/docs/misc/arm/booting.txt
> index 9802e5e..c7c1d7e 100644
> --- a/docs/misc/arm/booting.txt
> +++ b/docs/misc/arm/booting.txt
> @@ -23,6 +23,17 @@ The exceptions to this on 32-bit ARM are as follows:
>  
>  There are no exception on 64-bit ARM.
>  
> +
> +Firmware/bootloader requirements
> +--------------------------------
> +
> +Xen relies on some settings the firmware has to configure in EL3 before 
> starting Xen.
> +
> +* Xen must be entered in NS EL2 mode
> +
> +* The bit SCR_EL3.HCR (resp. SCR.HCE for 32-bit ARM) must be set to 1.
> +
> +
>  [1] linux/Documentation/arm/Booting
>  Latest version: 
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/arm/Booting
>  
> -- 
> 2.8.1
> 

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