Doc: Add one new known issue into v0.5 release note
@@ -246,6 +246,13 @@ Known Issues
**Workaround:** Unplug and plug-in the USB keyboard and mouse after exiting UOS.
+:acrn-issue:`2338` - [UP2]Lost 2G memory in SOS when using SBL as bootloader on UP2.
+ After using SBL as bootloader to boot UP2, SOS only has 2G memory with 4G physical memory bank.
+
+ **Impact:** lost 2G memory in SOS.
+
+ **Workaround:** None. The issue will be fixed in the next release.
+
.. comment
Use the syntax:
