n1sdp: update documentation for 2021.05.26 platform releaseN1SDP-2021.05.26

The documents are updated for the N1SDP-2021.05.26, which is an
incremental bug fix release for the tagged N1SDP-2021.04.26 release.

Signed-off-by: Khasim Syed Mohammed <khasim.mohammed@arm.com>
Change-Id: Ibc34b3726430d0a4f3d2706e6cb9430988019b6c

3 files changed, 36 insertions, 14 deletions

diff --git a/change-log.rst b/change-log.rst
index 18e7a13..143ad5e 100755
--- a/change-log.rst
+++ b/change-log.rst
@@ -9,6 +9,31 @@ Change Log
 This document contains a summary of the incremental features, changes, fixes and known
 issues in each release of N1SDP stack. It is listed in the order of latest to oldest
 
+Tagged Version - N1SDP-2021.05.26
+----------------------------------------
+Fixes
+^^^^^
+- The --no-uefi-secure-boot option is appended to grub_install in
+  Ubuntu installer.
+
+Known Issues and Limitations
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+- Patches providing proof of concept support for Xilinx CCIX accelerator
+  endpoints are no longer included in this release.
+- PCIe root port is limited to GEN3 speed due to the on-board PCIe
+  switch itself only supporting upto GEN3 speed.
+- Page Request Interface (PRI) feature is not available in both SMMUs
+  interfacing with the PCIe root ports.
+- Currently only Micron 8GB single Rank DIMMs
+  (part number: MTA9ASF1G72PZ-2G6D1) and 16GB dual Rank DIMMs
+  (part number:MTA18ASF2G72PDZ-2G6E1) are supported.
+- Stability issues have been observed on long stress tests of the
+  system.
+- On-board HDMI connection is not supported for graphics output. A PCIe
+  graphics card can be used for graphics support.
+- If either of the two boards needs to boot-up in a single chip mode
+  with a C2C setup, then the other board should be powered off.
+
 Tagged Version - N1SDP-2021.04.26
 ----------------------------------------
 New Features
diff --git a/release-notes.rst b/release-notes.rst
index 05f1448..3719eb9 100755
--- a/release-notes.rst
+++ b/release-notes.rst
@@ -9,18 +9,17 @@ Release Notes
 
 Features and Fixes
 ------------------
-The following is a summary of the key software features of the tagged N1SDP-2021.04.26 release.
+The tagged N1SDP-2021.05.26 is an incremental bug fix release for the
+tagged N1SDP-2021.04.26 release.
 
-- Linux Kernel upgraded to version 5.10.
-- Updated System Control Processor (SCP) firmware to commit id (6c15afb1b37d0728482c598b063cd69bfc733e93) from master branch.
-- Updated trusted-firmware-a (TF-A) to commit id (332649da478147b3d03132deb3783dd62fd475d7) from master branch.
-- EDK2 upgraded to tagged version edk2-stable202102.
-- Updated Grub for Poky Distribution to release tag grub-2.06-rc1 to incorporate fixes for the vulnerabilities.
-  For details please refer to `GRUB2 vulnerabilities`_.
-- Supported enabling L3 cache from BOOTGPR1 register. For details please refer to `user guide`_.
-- Enabled non-secure AXI access to CoreSight devices on the secondary board of C2C setup.
+Please refer to the `release notes`_ of N1SDP-2021.04.26 for more
+details on features and fixes available in the release, for CCIX
+accelerator profile please refer to `release link`_.
 
-This release is made to restructure the N1SDP profile majorly considering the single and multi-chip profiles, for CCIX accelerator profile please refer to `release link`_.
+Bug Fix
+^^^^^^^
+- The --no-uefi-secure-boot option is appended to grub_install in
+  Ubuntu installer.
 
 Precautions
 -----------
@@ -66,11 +65,9 @@ Support
 -------
 For support email: support-subsystem-enterprise@arm.com
 
-.. _PCIE: pcie-support.rsti
 .. _release link: https://git.linaro.org/landing-teams/working/arm/arm-reference-platforms.git/tree/?h=N1SDP-2020.07.27
 .. _potential damage: https://community.arm.com/developer/tools-software/oss-platforms/w/docs/604/notice-potential-damage-to-n1sdp-boards-if-using-latest-firmware-release
-.. _user guide: user-guide.rst
-.. _GRUB2 vulnerabilities: https://lists.gnu.org/archive/html/grub-devel/2021-03/msg00007.html
+.. _release notes: https://git.linaro.org/landing-teams/working/arm/arm-reference-platforms.git/tree/release-notes.rst?h=n1sdp-v2&id=a4c9f5147b357f1ef435ea5966e7b6be6aa9b792
 
 --------------
 
diff --git a/user-guide.rst b/user-guide.rst
index 493ea7b..51ff57a 100644
--- a/user-guide.rst
+++ b/user-guide.rst
@@ -86,7 +86,7 @@ First, create a new folder that will be your workspace and will henceforth be re
 
     mkdir <n1sdp_workspace>
     cd <n1sdp_workspace>
-    export N1SDP_RELEASE=refs/tags/N1SDP-2021.04.26
+    export N1SDP_RELEASE=refs/tags/N1SDP-2021.05.26
 
 NOTE: Sometimes new features and additional bug fixes will be made available in the git repositories
 and will not yet have been tagged as part of a release. To pickup these latest changes you can drop