General code modification for mpc7448hpc2 board support.

1. Add 7447A and 7448 processor support.
2. Add the following flags.

CFG_CONFIG_BUS_CLK : If the 74xx bus frequency can be configured dynamically
(such as by switch on board), this flag should be set.

CFG_EXCEPTION_AFTER_RELOCATE: If an exception occurs after the u-boot
relocates to RAM, this flag should be set.

CFG_SERIAL_HANG_IN_EXCEPTION: If the print out function will cause the
system hang in exception, this flag should be set.

There is a design issue for tsi108/109 pci configure  read. When pci scan
the slots, if there is no pci card, the tsi108/9 will cause a machine
check exception for mpc7448 processor.

Signed-off-by: Alexandre Bounine <alexandreb@tundra.com>
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>

include/74xx_7xx.h

@@ -112,6 +112,7 @@ typedef enum __cpu_t {
 	CPU_7400,
 	CPU_7410,
 	CPU_7450, CPU_7455, CPU_7457,
+	CPU_7447A, CPU_7448,
 	CPU_UNKNOWN} cpu_t;
 
 extern cpu_t get_cpu_type(void);

include/asm-ppc/global_data.h

@@ -49,6 +49,9 @@ typedef	struct	global_data {
 	unsigned long	scc_clk;
 	unsigned long	brg_clk;
 #endif
+#if defined(CONFIG_MPC7448HPC2)
+	unsigned long   mem_clk;
+#endif
 #if defined(CONFIG_MPC83XX)
 	/* There are other clocks in the MPC83XX */
 	u32 csb_clk;