Hi Luca,
On 13/05/2025 09:45, Luca Fancellu wrote:
Document the requirement needed to boot Xen on Armv8-R platforms.
Signed-off-by: Luca Fancellu <luca.fance...@arm.com>
Reviewed-by: Ayan Kumar Halder <ayan.kumar.hal...@amd.com>
Reviewed-by: Michal Orzel <michal.or...@amd.com>
> ---> v5 changes:
- restructured and removed some EL3 reference that might not
be there on Armv8-R aarch64
- add R-by Ayan and Michal
v4 changes:
- New patch
---
docs/misc/arm/booting.txt | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/docs/misc/arm/booting.txt b/docs/misc/arm/booting.txt
index 21ae74837dcc..ca05274392be 100644
--- a/docs/misc/arm/booting.txt
+++ b/docs/misc/arm/booting.txt
@@ -56,12 +56,17 @@ image header to determine the load address, entry point,
etc.
Firmware/bootloader requirements
--------------------------------
-Xen relies on some settings the firmware has to configure in EL3 before starting Xen.
+Xen relies on some settings the firmware has to configure before starting Xen.
-* Xen must be entered in NS EL2 mode
+* Xen must be entered in:
+ * Non-Secure EL2 mode for Armv8-A Arm64 and Arm32, Armv8-R Arm32.
+ * Secure EL2 mode for Armv8-R Arm64.
-* The bit SCR_EL3.HCE (resp. SCR.HCE for 32-bit ARM) must be set to 1.
+* When EL3 is supported, the bit SCR_EL3.HCE (resp. SCR.HCE for 32-bit ARM)
must
+ be set to 1.
+* Xen must be entered with MMU/MPU off and data cache disabled (SCTLR_EL2.M bit
+ and SCTLR_EL2.C set to 0).
The document read much better. Thanks for the update:
Acked-by: Julien Grall <jgr...@amazon.com>
Cheers,
--
Julien Grall
