Bootloaders: use "DRAM" instead of "RAM" for consistency

- And to avoid the ambiguity with SRAM

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>

slides/sysdev-bootloaders-sequence/sysdev-bootloaders-sequence.tex

@@ -117,12 +117,12 @@ \subsection{Boot Sequence}
       possible in standard boot mode.
     \item {\bf U-Boot SPL}: runs from SRAM. Initializes the DRAM,
       the NAND or SPI controller, and loads the secondary bootloader
-      into RAM and starts it. No user interaction possible.
-    \item {\bf U-Boot}: runs from RAM. Initializes some other hardware
+      into DRAM and starts it. No user interaction possible.
+    \item {\bf U-Boot}: runs from DRAM. Initializes some other hardware
       devices (network, USB, etc.).  Loads the kernel image from
-      storage or network to RAM and starts it. Shell with commands
+      storage or network to DRAM and starts it. Shell with commands
       provided.
-    \item {\bf Linux Kernel}: runs from RAM. Takes over the system
+    \item {\bf Linux Kernel}: runs from DRAM. Takes over the system
       completely (the bootloader no longer exists).
     \end{itemize}
     Note: same process on other Microchip AT91 SoCs, but the
@@ -139,14 +139,14 @@ \subsection{Boot Sequence}
     \footnotesize
     \begin{itemize}
     \item {\bf ROM Code}: tries to find a valid bootstrap image from
-      various storage sources, and load it into RAM. The RAM
+      various storage sources, and load it into DRAM. The DRAM
       configuration is described in a CPU-specific header, prepended
       to the bootloader image.
-    \item {\bf U-Boot}: runs from RAM. Initializes some other hardware
+    \item {\bf U-Boot}: runs from DRAM. Initializes some other hardware
       devices (network, USB, etc.).  Loads the kernel image from
-      storage or network to RAM and starts it. Shell with commands
+      storage or network to DRAM and starts it. Shell with commands
       provided. File called \code{u-boot.kwb}.
-    \item {\bf Linux Kernel}: runs from RAM. Takes over the system
+    \item {\bf Linux Kernel}: runs from DRAM. Takes over the system
       completely (bootloaders no longer exists).
     \end{itemize}
   \end{columns}