Move framebuffer init past mmu_init and map the framebuffer.

Add more fields to arch framebuffer to hold the physical address and
size of the framebuffer. Then fill these in when mapping the
framebuffer to virtual memory.

src/system/boot/arch/arm/arch_framebuffer.h

@@ -38,6 +38,8 @@ public:
 								{ return B_OK; };
 
 	virtual addr_t			Base() { return fBase; };
+			addr_t			PhysicalBase() { return fPhysicalBase; };
+			size_t			Size() { return fSize; };
 
 			int				Width() { return fCurrentWidth; };
 			int				Height() { return fCurrentHeight; };
@@ -46,6 +48,8 @@ public:
 
 protected:
 			addr_t			fBase;
+			addr_t			fPhysicalBase;
+			size_t			fSize;
 			int				fCurrentWidth;
 			int				fCurrentHeight;
 			int				fCurrentDepth;

src/system/boot/platform/raspberrypi_arm/arch_framebuffer_bcm2708.cpp

@@ -154,14 +154,12 @@ ArchFramebufferBCM2708::SetVideoMode(int width, int height, int depth)
 		&& sFramebufferConfig.screen_size >= sFramebufferConfig.bytes_per_row
 			* sFramebufferConfig.height);
 
-#if 1
-	fBase = BCM2708_BUS_TO_PHYSICAL(sFramebufferConfig.frame_buffer_address);
-#else
-	// TODO: Enable when the MMU works.
-	fBase = (addr_t)mmu_map_physical_memory(
-			BCM2708_BUS_TO_PHYSICAL(sFramebufferConfig.frame_buffer_address),
-			sFramebufferConfig.screen_size, MMU_L2_FLAG_AP_RW | MMU_L2_FLAG_C);
-#endif
+	fPhysicalBase
+		= BCM2708_BUS_TO_PHYSICAL(sFramebufferConfig.frame_buffer_address);
+	fSize = sFramebufferConfig.screen_size;
+
+	fBase = (addr_t)mmu_map_physical_memory(fPhysicalBase, fSize,
+		kDefaultPageFlags);
 
 	uint8* line = (uint8*)fBase;
 	for (uint32 y = 0; y < sFramebufferConfig.height; y++) {

src/system/boot/platform/raspberrypi_arm/start.cpp

@@ -116,12 +116,10 @@ _start(void)
 	// Flick on "OK" led, use pre-mmu firmware base
 	gpio_write(gPeripheralBase + GPIO_BASE, 16, 0);
 
-	// Set up the framebuffer here to help debug the early boot.
-	platform_init_video();
-
 	// To debug mmu, enable serial_init above me!
 	mmu_init();
 
+	platform_init_video();
 	serial_init();
 	console_init();