platform/u-boot: Work towards using arm mailbox driver

* Reference bcm2708 framebuffer when it makes sense
* Add bcm2708 define to Raspberry Pi board_config.h

headers/private/kernel/arch/arm/board/raspberry_pi/board_config.h

@@ -11,7 +11,8 @@
 
 #define BOARD_NAME_PRETTY "Raspberry Pi"
 
-#define BOARD_CPU_ARM6 1
+#define BOARD_CPU_TYPE_ARM6 1
+#define BOARD_CPU_BCM2708 1
 
 #include <arch/arm/bcm2708.h>
 

src/system/boot/platform/u-boot/arch/arm/Jamfile

@@ -1,6 +1,8 @@
 SubDir HAIKU_TOP src system boot platform u-boot arch arm ;
 
 SubDirHdrs $(HAIKU_TOP) src system boot platform $(TARGET_BOOT_PLATFORM) ;
+SubDirHdrs $(HAIKU_TOP) src system boot arch $(TARGET_KERNEL_ARCH) ;
+
 UsePrivateSystemHeaders ;
 UsePrivateHeaders kernel [ FDirName kernel arch $(TARGET_KERNEL_ARCH) ] 
 	[ FDirName kernel boot platform $(HAIKU_BOOT_PLATFORM) ] ;
@@ -11,6 +13,8 @@ SubDirC++Flags -fno-rtti ;
 BootMergeObject boot_platform_u-boot_arm.o :
 	# must come first to have _start_* at correct locations
 	shell.S
+
+	arch_mailbox.cpp
 	: -fno-pic
 ;
 

src/system/boot/platform/u-boot/arch/arm/arch_mailbox.cpp

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2012-2015 Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Alexander von Gluck IV, [email protected]
+ */
+
+
+#include "arch_mailbox.h"
+
+#include <board_config.h>
+
+
+ArchMailbox *gMailbox = NULL;
+
+
+extern "C" status_t
+arch_mailbox_init()
+{
+	#if defined(BOARD_CPU_BCM2708)
+	extern ArchMailbox *arch_get_mailbox_arm_bcm2708(addr_t base);
+	#warning ARM: Add gPeripheralBase to ARM_CTRL_0_MAILBOX_BASE
+	gMailbox = arch_get_mailbox_arm_bcm2708(ARM_CTRL_0_MAILBOX_BASE);
+	#endif
+	return B_OK;
+}

src/system/boot/platform/u-boot/start.cpp

@@ -60,6 +60,10 @@ extern "C" int start_gen(int argc, const char **argv,
 	struct image_header *uimage=NULL, void *fdt=NULL);
 extern "C" void dump_uimage(struct image_header *image);
 extern "C" void dump_fdt(const void *fdt);
+#if defined(__ARM__)
+extern "C" status_t arch_mailbox_init();
+#endif
+
 
 // declared in shell.S
 // those are initialized to NULL but not in the BSS
@@ -210,6 +214,9 @@ start_gen(int argc, const char **argv, struct image_header *uimage, void *fdt)
 		gFDT = args.platform.fdt_data;
 	}
 
+	#if defined(__ARM__)
+	arch_mailbox_init();
+	#endif
 	serial_init(gFDT);
 	console_init();
 	// initialize the OpenFirmware wrapper

src/system/boot/platform/u-boot/video.cpp

@@ -108,6 +108,10 @@ platform_init_video(void)
 	#if defined(BOARD_CPU_ARM920T)
 		extern ArchFramebuffer *arch_get_fb_arm_920(addr_t base);
 		gFramebuffer = arch_get_fb_arm_920(0x88000000);
+	#elif defined(BOARD_CPU_BCM2708)
+		extern ArchFramebuffer *arch_get_fb_arm_bcm2708(addr_t base);
+		// BCM2708 gets its framebuffer base from a Mailbox
+		gFramebuffer = arch_get_fb_arm_bcm2708(0x0);
 	#elif defined(BOARD_CPU_OMAP3)
 		extern ArchFramebuffer *arch_get_fb_arm_omap3(addr_t base);
 		gFramebuffer = arch_get_fb_arm_omap3(FB_BASE);