This patch should make ATY and PM2 compilable as modules:
(but I have no way to test it not having a PC with either of those cards).

--- linux/drivers/video/pm2fb.c.jj	Tue Jan  4 11:33:18 2000
+++ linux/drivers/video/pm2fb.c	Tue Feb  8 16:19:46 2000
@@ -2031,12 +2031,12 @@ void pm2fb_cleanup(struct fb_info* info)
 		board_table[i->board].cleanup(i);
 }
 
-__initfunc(void pm2fb_init(void)) {
+int __init pm2fb_init(void) {
 
 	memset(&fb_info, 0, sizeof(fb_info));
 	memcpy(&fb_info.current_par, &pm2fb_options.user_mode, sizeof(fb_info.current_par));
 	if (!pm2fb_conf(&fb_info))
-		return;
+		return 0;
 	pm2fb_reset(&fb_info);
 	fb_info.disp.scrollmode=SCROLL_YNOMOVE;
 	fb_info.gen.parsize=sizeof(struct pm2fb_par);
@@ -2055,7 +2055,7 @@ __initfunc(void pm2fb_init(void)) {
 	fbgen_install_cmap(0, &fb_info.gen);
 	if (register_framebuffer(&fb_info.gen.info)<0) {
 		printk("pm2fb: unable to register.\n");
-		return;
+		return 0;
 	}
 	printk("fb%d: %s (%s), using %uK of video memory.\n",
 				GET_FB_IDX(fb_info.gen.info.node),
@@ -2063,6 +2063,7 @@ __initfunc(void pm2fb_init(void)) {
 				permedia2_name,
 				(u32 )(fb_info.regions.fb_size>>10));
 	MOD_INC_USE_COUNT;
+	return 1;
 }
 
 static void __init pm2fb_mode_setup(char* options) {
@@ -2117,7 +2118,8 @@ MODULE_PARM(mode, "s");
 
 int init_module(void) {
 	if (mode) pm2fb_mode_setup(mode);
-  	pm2fb_init();
+	if (!pm2fb_init())
+		return -ENXIO;
 }
 
 void cleanup_module(void) {
--- linux/drivers/video/atyfb.c.jj	Thu Dec  9 10:38:29 1999
+++ linux/drivers/video/atyfb.c	Tue Feb  8 16:25:01 2000
@@ -392,7 +392,7 @@ static int read_aty_sense(const struct f
      *  Interface used by the world
      */
 
-void atyfb_init(void);
+int atyfb_init(void);
 #ifdef CONFIG_FB_OF
 void atyfb_of_init(struct device_node *dp);
 #endif
@@ -2789,7 +2789,7 @@ __initfunc(static int aty_init(struct fb
     return 1;
 }
 
-__initfunc(void atyfb_init(void))
+int __init atyfb_init(void)
 {
 #if defined(CONFIG_FB_OF)
     /* We don't want to be called like this. */
@@ -2809,7 +2809,7 @@ __initfunc(void atyfb_init(void))
 
     /* Do not attach when we have a serial console. */
     if (!con_is_present())
-	return;
+	return 0;
 #else
     u16 tmp;
 #endif
@@ -2821,7 +2821,7 @@ __initfunc(void atyfb_init(void))
 	    info = kmalloc(sizeof(struct fb_info_aty), GFP_ATOMIC);
 	    if (!info) {
 		printk("atyfb_init: can't alloc fb_info_aty\n");
-		return;
+		return 0;
 	    }
 	    memset(info, 0, sizeof(struct fb_info_aty));
 
@@ -2857,7 +2857,7 @@ __initfunc(void atyfb_init(void))
 	    if (!info->mmap_map) {
 		printk("atyfb_init: can't alloc mmap_map\n");
 		kfree(info);
-		return;
+		return 0;
 	    }
 	    memset(info->mmap_map, 0, j * sizeof(*info->mmap_map));
 
@@ -3037,7 +3037,7 @@ __initfunc(void atyfb_init(void))
 
 	    if(!info->ati_regbase) {
 		    kfree(info);
-		    return;
+		    return 0;
 	    }
 
 	    info->ati_regbase_phys += 0xc00;
@@ -3064,7 +3064,7 @@ __initfunc(void atyfb_init(void))
 
 	    if(!info->frame_buffer) {
 		    kfree(info);
-		    return;
+		    return 0;
 	    }
 
 #endif /* __sparc__ */
@@ -3073,7 +3073,7 @@ __initfunc(void atyfb_init(void))
 		if (info->mmap_map)
 		    kfree(info->mmap_map);
 		kfree(info);
-		return;
+		return 0;
 	    }
 
 #ifdef __sparc__
@@ -3111,7 +3111,7 @@ __initfunc(void atyfb_init(void))
 	info = kmalloc(sizeof(struct fb_info_aty), GFP_ATOMIC);
 	if (!info) {
 	    printk("atyfb_init: can't alloc fb_info_aty\n");
-	    return;
+	    return 0;
 	}
 	memset(info, 0, sizeof(struct fb_info_aty));
 
@@ -3127,10 +3127,11 @@ __initfunc(void atyfb_init(void))
 	if (!aty_init(info, "ISA bus")) {
 	    kfree(info);
 	    /* This is insufficient! kernel_map has added two large chunks!! */
-	    return;
+	    return 0;
 	}
     }
 #endif
+    return 1;
 }
 
 #ifdef CONFIG_FB_OF
@@ -4038,3 +4039,46 @@ aty_sleep_notify(struct pmu_sleep_notifi
 	return PBOOK_SLEEP_OK;
 }
 #endif /* CONFIG_PMAC_PBOOK */
+
+#ifdef MODULE
+
+int blink = 1;
+static u32 vram = 0;
+static int pll = 0;
+static int mclk = 0;
+#if defined(CONFIG_PPC)
+static int vmode = VMODE_NVRAM;
+static int cmode = CMODE_NVRAM;
+#endif
+
+MODULE_PARM(noaccel, "i");
+MODULE_PARM_DESC(noaccel, "Do not use accelerating engine (0 or 1=disabled) (default=0)");
+MODULE_PARM(blink, "i");
+MODULE_PARM_DESC(blink, "Enables hardware cursor blinking (0 or 1) (default=1)");
+#ifdef CONFIG_PPC
+MODULE_PARM(vmode, "i");
+MODULE_PARM_DESC(vmode, "Specify the vmode mode number that should be used (640x480 default)");
+MODULE_PARM(cmode, "i");
+MODULE_PARM_DESC(cmode, "Specify the video depth that should be used (8bit default)");
+#endif
+
+int init_module(void)
+{
+	curblink = blink;
+	default_vram = vram;
+	default_pll = pll;
+	default_mclk = mclk;
+#ifdef CONFIG_PPC
+	default_vmode = vmode;
+	default_cmode = cmode;
+#endif
+	if (!atyfb_init())
+		return -ENXIO;
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+void cleanup_module(void)
+{
+}
+#endif	/* MODULE */
--- linux/drivers/video/Config.in.jj	Tue Jan  4 09:06:01 2000
+++ linux/drivers/video/Config.in	Tue Feb  8 16:22:25 2000
@@ -6,7 +6,7 @@ if [ "$CONFIG_FB" = "y" ]; then
   define_bool CONFIG_DUMMY_CONSOLE y
   if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
     if [ "$CONFIG_AMIGA" = "y" -o "$CONFIG_PCI" = "y" ]; then
-      bool 'Permedia2 support (experimental)' CONFIG_FB_PM2
+      tristate 'Permedia2 support (experimental)' CONFIG_FB_PM2
       if [ "$CONFIG_FB_PM2" = "y" ]; then
         if [ "$CONFIG_PCI" = "y" ]; then
           bool '  enable FIFO disconnect feature' CONFIG_FB_PM2_FIFO_DISCONNECT
@@ -81,7 +81,7 @@ if [ "$CONFIG_FB" = "y" ]; then
     define_bool CONFIG_BUS_I2C y
   fi
   if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
-    if [ "$CONFIG_PCI" != "n" ]; then
+    if [ "$CONFIG_PCI" != "n" -a "$ARCH" != "sparc" -a "$ARCH" != "sparc64" ]; then
       tristate 'Matrox acceleration' CONFIG_FB_MATROX
       if  [ "$CONFIG_FB_MATROX" != "n" ]; then
         bool '  Millennium I/II support' CONFIG_FB_MATROX_MILLENIUM
@@ -89,7 +89,7 @@ if [ "$CONFIG_FB" = "y" ]; then
         bool '  G100/G200 support' CONFIG_FB_MATROX_G100
         bool '  Multihead support' CONFIG_FB_MATROX_MULTIHEAD
       fi
-      bool 'ATI Mach64 display support' CONFIG_FB_ATY
+      tristate 'ATI Mach64 display support' CONFIG_FB_ATY
     fi
   fi
   if [ "$ARCH" = "sparc" -o "$ARCH" = "sparc64" ]; then