Increase default amount of RAM for Base FVPs in FDTs

- Large RAM-disks may have trouble starting with 2GB of memory.
- Increase from 2GB to 4GB in FDT.

Change-Id: I12c1b8e5db41114b88c69c48621cb21247a6a6a7
diff --git a/docs/change-log.md b/docs/change-log.md
index 61499c7..ee9be77 100644
--- a/docs/change-log.md
+++ b/docs/change-log.md
@@ -20,6 +20,10 @@
 *   Unmask SError and Debug exceptions in the trusted firmware.
     Also route external abort and SError interrupts to EL3.
 
+*   The amount of physical RAM available to Linux as specified in the FDTs for
+    Base FVPs have been increased from 2GB to 4GB. This resolves the issue of
+    failing to start user-space when using a RAM-disk file-system.
+
 
 ARM Trusted Firmware - version 0.2
 ==================================
diff --git a/docs/user-guide.md b/docs/user-guide.md
index 45e850b..2c7439a 100644
--- a/docs/user-guide.md
+++ b/docs/user-guide.md
@@ -338,10 +338,6 @@
 
 ##### Prepare RAM-disk
 
-NOTE: The RAM-disk option does not currently work with the Linux kernel version
-described above; use the VirtioBlock method instead. For further information
-please see the "Known issues" section in the [Change Log].
-
 To prepare a RAM-disk root file-system, do the following:
 
 1.  Download the file-system image: