lxfb: rename kernel arg fbsize to vram

Match other fb drivers (including gxfb).  Also, document the current boot
arguments in Documentation/fb/lxfb.txt.
Signed-off-by: NAndres Salomon <dilinger@debian.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Documentation/fb/lxfb.txt

+[This file is cloned from VesaFB/aty128fb]
+
+What is lxfb?
+=================
+
+This is a graphics framebuffer driver for AMD Geode LX based processors.
+
+Advantages:
+
+ * No need to use AMD's VSA code (or other VESA emulation layer) in the
+   BIOS.
+ * It provides a nice large console (128 cols + 48 lines with 1024x768)
+   without using tiny, unreadable fonts.
+ * You can run XF68_FBDev on top of /dev/fb0
+ * Most important: boot logo :-)
+
+Disadvantages:
+
+ * graphic mode is slower than text mode...
+
+
+How to use it?
+==============
+
+Switching modes is done using  lxfb.mode_option=<resolution>... boot
+parameter or using `fbset' program.
+
+See Documentation/fb/modedb.txt for more information on modedb
+resolutions.
+
+
+X11
+===
+
+XF68_FBDev should generally work fine, but it is non-accelerated.
+
+
+Configuration
+=============
+
+You can pass kernel command line options to lxfb with lxfb.<option>.
+For example, lxfb.mode_option=800x600@75.
+Accepted options:
+
+mode_option	- specify the video mode.  Of the form
+		  <x>x<y>[-<bpp>][@<refresh>]
+vram		- size of video ram (normally auto-detected)
+
+--
+Andres Salomon <dilinger@debian.org>

drivers/video/geode/lxfb_core.c

@@ -27,7 +27,7 @@
 
 static char *mode_option;
 static int noclear, nopanel, nocrt;
-static int fbsize;
+static int vram;
 
 /* Most of these modes are sorted in ascending order, but
  * since the first entry in this table is the "default" mode,
@@ -339,7 +339,7 @@ static int __init lxfb_map_video_memory(struct fb_info *info,
 		return ret;
 
 	info->fix.smem_start = pci_resource_start(dev, 0);
-	info->fix.smem_len = fbsize ? fbsize : lx_framebuffer_size();
+	info->fix.smem_len = vram ? vram : lx_framebuffer_size();
 
 	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
 
@@ -608,9 +608,7 @@ static int __init lxfb_setup(char *options)
 		if (!*opt)
 			continue;
 
-		if (!strncmp(opt, "fbsize:", 7))
-			fbsize = simple_strtoul(opt+7, NULL, 0);
-		else if (!strcmp(opt, "noclear"))
+		if (!strcmp(opt, "noclear"))
 			noclear = 1;
 		else if (!strcmp(opt, "nopanel"))
 			nopanel = 1;
@@ -647,8 +645,8 @@ module_exit(lxfb_cleanup);
 module_param(mode_option, charp, 0);
 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
 
-module_param(fbsize, int, 0);
-MODULE_PARM_DESC(fbsize, "video memory size");
+module_param(vram, int, 0);
+MODULE_PARM_DESC(vram, "video memory size");
 
 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode LX");
 MODULE_LICENSE("GPL");