fw: fix upload of 256k roms

Minimig overlays the kickrom at boot from address 0xf80000 to
address 0x0, but the 256k usually runs at address 0xfc0000.
E.g., with kickrom 1.3, the first instructions in the overlayed
ROM (at 0xf80000) will cause a jump to address 0xfc00d2.

This patch remedies the problem by copying the rom to
both 0xf80000 and 0xfc0000.

fw/ctrl/config.c

@@ -109,6 +109,11 @@ char UploadKickstart(char *name)
         SPIN(); SPIN(); SPIN(); SPIN(); SPIN(); SPIN(); SPIN(); SPIN();
         data = ((unsigned int*)sector_buffer)[j>>2];
         if (data != read32(offset+base+i*512+j)) printf("Mismatch @ 0x%08x : 0x%08x != 0x%08x\r", offset+base+i*512+j, data, read32(offset+base+i*512+j));
+        // For 256k roms (e.g. 1.3), copy the content to both 0xf80000 and 0xfc0000.
+        // This is necessary, since minimig will overlay the kickrom at boot to
+        // 0 => 0xf80000, but the 256k roms will expect to run at 0xfc0000
+        if (romfile.size == 0x40000)
+          write32(offset+base+0x40000+i*512+j, data);
       }
       DisableOsd();
     }