86xx: Report which "bank" of NOR flash we are booting from on MPC8641HPCN

The MPC8641HPCN board is capable of swizzling the upper address bit of
the NOR flash we boot out of which creates the concept of "virtual"
banks.  This is useful in that we can flash a test of image of u-boot
and reset to one of the virtual banks while still maintaining a
working image in "bank 0".

The PIXIS FPGA exposes registers on LBC which we can use to determine
which "bank" we are booting out of (as well as setting which bank to
boot out of).

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

board/freescale/mpc8641hpcn/mpc8641hpcn.c

@@ -42,10 +42,20 @@ int board_early_init_f(void)
 
 int checkboard(void)
 {
-	printf ("Board: MPC8641HPCN, System ID: 0x%02x, "
-		"System Version: 0x%02x, FPGA Version: 0x%02x\n",
-		in8(PIXIS_BASE + PIXIS_ID), in8(PIXIS_BASE + PIXIS_VER),
-		in8(PIXIS_BASE + PIXIS_PVER));
+	u8 vboot;
+	u8 *pixis_base = (u8 *)PIXIS_BASE;
+
+	printf ("Board: MPC8641HPCN, Sys ID: 0x%02x, "
+		"Sys Ver: 0x%02x, FPGA Ver: 0x%02x, ",
+		in_8(pixis_base + PIXIS_ID), in_8(pixis_base + PIXIS_VER),
+		in_8(pixis_base + PIXIS_PVER));
+
+	vboot = in_8(pixis_base + PIXIS_VBOOT);
+	if (vboot & PIXIS_VBOOT_FMAP)
+		printf ("vBank: %d\n", ((vboot & PIXIS_VBOOT_FBANK) >> 6));
+	else
+		puts ("Promjet\n");
+
 #ifdef CONFIG_PHYS_64BIT
 	printf ("       36-bit physical address map\n");
 #endif

include/configs/MPC8641HPCN.h

@@ -224,6 +224,8 @@ extern unsigned long get_board_sys_clk(unsigned long dummy);
 #define PIXIS_VCFGEN0		0x12	/* VELA Config Enable 0 */
 #define PIXIS_VCFGEN1		0x13	/* VELA Config Enable 1 */
 #define PIXIS_VBOOT		0x16	/* VELA VBOOT Register */
+#define PIXIS_VBOOT_FMAP	0x80	/* VBOOT - CFG_FLASHMAP */
+#define PIXIS_VBOOT_FBANK	0x40	/* VBOOT - CFG_FLASHBANK */
 #define PIXIS_VSPEED0		0x17	/* VELA VSpeed 0 */
 #define PIXIS_VSPEED1		0x18	/* VELA VSpeed 1 */
 #define PIXIS_VCLKH		0x19	/* VELA VCLKH register */