Map SRAM1 to RAM address space

Nixie_Firmware_Rust/memory.x

@@ -4,7 +4,7 @@ MEMORY
   /* TODO Adjust these memory regions to match your device memory layout */
   /* These values correspond to the LM3S6965, one of the few devices QEMU can emulate */
   FLASH : ORIGIN = 0x00000000, LENGTH = 256K
-  RAM : ORIGIN = 0x20000000, LENGTH = 64K
+  RAM : ORIGIN = 0x20000000, LENGTH = 48K
 }
 
 /* This is where the call stack will be allocated. */