This works on a Sony Vaio PCG-F560K at LCD resolution
(1024x768), 8 and 16 bits, with acceleration on or off.
It's much more useful on this machine than the VESA
driver (which wedges the system).

Reference: /n/sources/patch/applied/vga-neomagic-256xlplus
Date: Wed Mar 11 18:21:10 CET 2009
Signed-off-by: davide+p9@cs.cmu.edu

--- /sys/src/cmd/aux/vga/neomagic.c	Wed Mar 11 18:16:52 2009
+++ /sys/src/cmd/aux/vga/neomagic.c	Wed Mar 11 18:16:51 2009
@@ -107,6 +107,11 @@
 			vga->vmz = 4096*1024;
 			vga->apz = 16*1024*1024;
 			break;
+		case 0x0016:			/* MagicMedia 256 XL+ */
+			vga->f[1] = 110000000;
+			vga->vmz = 4096*1024; /* Vaio VESA BIOS says 6080, but then hwgc doesn't work */
+			vga->apz = 32*1024*1024;
+			break;
 		case 0x0001:			/* MagicGraph 128 */
 		case 0x0002:			/* MagicGraph 128 V */
 		default:
--- /sys/src/9/pc/vganeomagic.c	Wed Mar 11 18:16:54 2009
+++ /sys/src/9/pc/vganeomagic.c	Wed Mar 11 18:16:53 2009
@@ -71,6 +71,12 @@
 			ioaddr = p->mem[1].bar & ~0x0F;
 			iosize = p->mem[1].size;
 			break;
+		case 0x0016:		/* MagicMedia 256XL+ */
+			curoff = 0x1000;
+			vmsize = 4096*1024; /* Vaio VESA BIOS says 6080, but then hwgc doesn't work */
+			ioaddr = p->mem[1].bar & ~0x0F;
+			iosize = p->mem[1].size;
+			break;
 		default:
 			return;
 		}
--- /lib/vgadb	Wed Mar 11 18:16:55 2009
+++ /lib/vgadb	Wed Mar 11 18:16:54 2009
@@ -327,6 +327,7 @@
 	vid=0x10C8 did=0x0004		# MagicGraph 128 XD
 	vid=0x10C8 did=0x0005		# MagicMedia 256 AV
 	vid=0x10C8 did=0x0006		# MagicMedia 256 ZX
+	vid=0x10C8 did=0x0016		# MagicMedia 256 XL+
 	0xC0048="MagicGraph 128XD"	# IBM Thinkpad 560X
 	0xC0048="MagicMedia 256AV"	# IBM Thinkpad 600E
 	0xC0048="MagicGraph 256 AV"	# IBM Thinkpad 570, 600E