Implement Voodoo CMDFIFO enable bit.

src/vid_voodoo.c

@@ -603,7 +603,10 @@ static void voodoo_writel(uint32_t addr, uint32_t val, void *p)
                 break;
                 case SST_fbiInit7:
                 if (voodoo->initEnable & 0x01)
+                {
                         voodoo->fbiInit7 = val;
+                        voodoo->cmdfifo_enabled = val & 0x100;
+                }
                 break;
 
                 case SST_cmdFifoBaseAddr:

src/vid_voodoo_banshee.c

@@ -1098,6 +1098,7 @@ static void banshee_cmd_write(banshee_t *banshee, uint32_t addr, uint32_t val)
                 case cmdBaseSize0:
                 voodoo->cmdfifo_size = val;
                 voodoo->cmdfifo_end = voodoo->cmdfifo_base + (((voodoo->cmdfifo_size & 0xff) + 1) << 12);
+                voodoo->cmdfifo_enabled = val & 0x100;
 //                pclog("cmdfifo_base=%08x  cmdfifo_end=%08x\n", voodoo->cmdfifo_base, voodoo->cmdfifo_end);
                 break;
                 
@@ -1437,7 +1438,7 @@ static void banshee_write_linear_l(uint32_t addr, uint32_t val, void *p)
 
         svga->changedvram[addr >> 12] = changeframecount;
         *(uint32_t *)&svga->vram[addr & svga->vram_mask] = val;
-        if (addr >= voodoo->cmdfifo_base && addr < voodoo->cmdfifo_end)
+        if (voodoo->cmdfifo_enabled && addr >= voodoo->cmdfifo_base && addr < voodoo->cmdfifo_end)
         {
 //                pclog("CMDFIFO write %08x %08x  old amin=%08x amax=%08x hlcnt=%i depth_wr=%i rp=%08x\n", addr, val, voodoo->cmdfifo_amin, voodoo->cmdfifo_amax, voodoo->cmdfifo_holecount, voodoo->cmdfifo_depth_wr, voodoo->cmdfifo_rp);
                 if (addr == voodoo->cmdfifo_base && !voodoo->cmdfifo_holecount)

src/vid_voodoo_common.h

@@ -299,6 +299,7 @@ typedef struct voodoo_t
         uint32_t cmdfifo_base, cmdfifo_end, cmdfifo_size;
         int cmdfifo_rp;
         volatile int cmdfifo_depth_rd, cmdfifo_depth_wr;
+        volatile int cmdfifo_enabled;
         uint32_t cmdfifo_amin, cmdfifo_amax;
         int cmdfifo_holecount;
 

src/vid_voodoo_fifo.c

@@ -237,7 +237,7 @@ void voodoo_fifo_thread(void *param)
                         voodoo->time += end_time - start_time;
                 }
 
-                while (voodoo->cmdfifo_depth_rd != voodoo->cmdfifo_depth_wr)
+                while (voodoo->cmdfifo_enabled && voodoo->cmdfifo_depth_rd != voodoo->cmdfifo_depth_wr)
                 {
                         uint64_t start_time = timer_read();
                         uint64_t end_time;