make RAM big enough for tinibios

[fw/sdcc] / sim / ucsim / s51.src / uc390.cc

diff --git a/sim/ucsim/s51.src/uc390.cc b/sim/ucsim/s51.src/uc390.cc
index 80dda525620c4b7ba040dceaa7a471536a5684d0..623d3915ae784dca32376fbade99c66e98edbd52 100644 (file)
--- a/sim/ucsim/s51.src/uc390.cc
+++ b/sim/ucsim/s51.src/uc390.cc
@@ -390,9 +390,12 @@ t_uc390::get_mem_size (enum mem_class type)
   switch (type)
     {
       case MEM_ROM:
-        return 128*1024;       // 4*1024*1024; 4 Meg possible
+        return 128*1024;         // 128 kByte; 4 MByte possible
       case MEM_XRAM:
-        return 128*1024;       // 4*1024*1024; 4 Meg possible
+       /* tinibios copies 128 bytes of the Interrupt Vector Table
+          to 0x100000. This is exactly the minimum of memory to run ucSim
+          without any error. */
+        return 1*1024*1024 + 128; // 1 MByte + 128 bytes; 4 Mbytes possible
       case MEM_IRAM:
         return 256;
       case MEM_SFR: