increase iram size

hdl/top/sf2-test/sf2_test.vhd

@@ -66,7 +66,7 @@ architecture behav of sf2_test is
   signal ahb_state : ahb_state_t;
 
   --  IRAM log size in bytes.
-  constant IRAM_LOG_SIZE : natural := 10;
+  constant IRAM_LOG_SIZE : natural := 12;
 
   signal iram_addr : std_logic_vector(IRAM_LOG_SIZE - 1 downto 2);
   signal iram_we : std_logic;