powerpc/p1023rds: Disable nor flash node and enable nand flash node

In the p1023rds, when system boots from nor flash, kernel only accesses nor
flash and can not access nand flash with BR0/OR0; when system boots from
nand flash, kernel only accesses nand flash and can not access nor flash
with BR0/OR0.

Default device tree nor and nand node should have the following structure:

	Example:

		nor_flash: nor@0,0 {
			#address-cells = <1>;
			#size-cells = <1>;
			compatible = "cfi-flash";
			reg = <0x0 0x0 0x02000000>;
			bank-width = <2>;
			device-width = <1>;
			status = "okay";

			partition@0 {
				label = "ramdisk";
				reg = <0x00000000 0x01c00000>;
			};
		}

		nand_flash: nand@1,0 {
			#address-cells = <1>;
			#size-cells = <1>;
			compatible = "fsl,p1023-fcm-nand",
				     "fsl,elbc-fcm-nand";
			reg = <0x2 0x0 0x00040000>;
			status = "disabled";

			u-boot-nand@0 {
				/* This location must not be altered  */
				/* 1MB for u-boot Bootloader Image */
				reg = <0x0 0x00100000>;
				read-only;
			};
		}

When booting from nor flash, the status of nor node is enabled and the
status of nand node is disabled in the default dts file, so do not do
anything.

But, when booting from nand flash, need to do some operations:

	o Disable the NOR node by setting status = "disabled";
	o Enable the NAND node by setting status = "okay";

Signed-off-by: Chunhe Lan <Chunhe.Lan@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

diff --git a/board/freescale/p1023rds/p1023rds.c b/board/freescale/p1023rds/p1023rds.c
index 546819cb59a953d96a2393569e823d55fbd2591e..082976a9240f8d4a255b045c3c2ca31809d30b6e 100644 (file)
--- a/board/freescale/p1023rds/p1023rds.c
+++ b/board/freescale/p1023rds/p1023rds.c
@@ -197,6 +197,12 @@ void ft_board_setup(void *blob, bd_t *bd)
 
        fdt_fixup_memory(blob, (u64)base, (u64)size);
 
+       /* By default NOR is on, and NAND is disabled */
+#ifdef CONFIG_NAND_U_BOOT
+       do_fixup_by_path_string(blob, "nor_flash", "status", "disabled");
+       do_fixup_by_path_string(blob, "nand_flash", "status", "okay");
+#endif
+
        fdt_fixup_fman_ethernet(blob);
 }
 #endif