[Xen-changelog] [xen master] xen: arm: doc: Add firmware requirements

[patchbot@xxxxxxx]

commit 7d59c1a9189549283654cd68892f7122cdd8fd14
Author:     Dirk Behme <dirk.behme@xxxxxxxxxxxx>
AuthorDate: Mon Apr 25 17:42:54 2016 +0200
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Wed Apr 27 16:44:27 2016 +0100

    xen: arm: doc: Add firmware requirements
    
    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>
---
 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
 
--
generated by git-patchbot for /home/xen/git/xen.git#master

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