mpc8641hpcn: Change PCI MEM pci bus address

Now that the rest of u-boot can support it, change the PCI bus
address of the PCI MEM regions from 0x80000000 to 0xc0000000,
and use the same bus address for both PCI1 and PCI2.  This will
maximize the amount of PCI address space left over to map RAM
on systems with large amounts of memory.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>

include/configs/MPC8641HPCN.h

@@ -336,7 +336,7 @@ extern unsigned long get_board_sys_clk(unsigned long dummy);
 
 #define CONFIG_SYS_PCI1_MEM_VIRT	0x80000000
 #ifdef CONFIG_PHYS_64BIT
-#define CONFIG_SYS_PCI1_MEM_BUS		CONFIG_SYS_PCI1_MEM_VIRT
+#define CONFIG_SYS_PCI1_MEM_BUS		0xc0000000
 #define CONFIG_SYS_PCI1_MEM_PHYS	0x0000000c00000000ULL
 #else
 #define CONFIG_SYS_PCI1_MEM_BUS		CONFIG_SYS_PCI1_MEM_VIRT
@@ -353,8 +353,17 @@ extern unsigned long get_board_sys_clk(unsigned long dummy);
 #define KSEG1ADDR(x)		({u32 _x=le32_to_cpu(*(u32 *)(x)); (&_x);})
 #define _IO_BASE		0x00000000
 
+#ifdef CONFIG_PHYS_64BIT
+/*
+ * Use the same PCI bus address on PCI1 and PCI2 if we have PHYS_64BIT.
+ * This will increase the amount of PCI address space available for
+ * for mapping RAM.
+ */
+#define CONFIG_SYS_PCI2_MEM_BUS		CONFIG_SYS_PCI1_MEM_BUS
+#else
 #define CONFIG_SYS_PCI2_MEM_BUS		(CONFIG_SYS_PCI1_MEM_BUS \
 					 + CONFIG_SYS_PCI1_MEM_SIZE)
+#endif
 #define CONFIG_SYS_PCI2_MEM_VIRT 	(CONFIG_SYS_PCI1_MEM_VIRT \
 					 + CONFIG_SYS_PCI1_MEM_SIZE)
 #define CONFIG_SYS_PCI2_MEM_PHYS	(CONFIG_SYS_PCI1_MEM_PHYS \