[U-Boot] [PATCH 2/2 v6] powerpc/p1023rds: Disable nor flash node and enable nand flash node

[U-Boot] [PATCH 2/2 v6] powerpc/p1023rds: Disable nor flash node and enable nand flash node

[Chunhe Lan]

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 at 0,0 {
			#address-cells = <1>;
			#size-cells = <1>;
			compatible = "cfi-flash";
			reg = <0x0 0x0 0x02000000>;
			bank-width = <2>;
			device-width = <1>;
			status = "okay";

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

		nand_flash: nand at 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 at 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>
---
Changes for v2:
	- used do_fixup_by_path_string() instead of fdt_set_node_status()
Changes for v3:
	- none
Changes for v4:
	- modified comments from Kumar Gala
	- no need for a separate function, and put the two lines in
	  ft_board_setup()
Changes for v5:
	- modified comments from Wolfgang Denk and Tabi Timur
Changes for v6:
	- modified comments from Wolfgang Denk
	- added change log

 board/freescale/p1023rds/p1023rds.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/board/freescale/p1023rds/p1023rds.c b/board/freescale/p1023rds/p1023rds.c
index 8cfd199..c99ccee 100644
--- a/board/freescale/p1023rds/p1023rds.c
+++ b/board/freescale/p1023rds/p1023rds.c
@@ -158,5 +158,10 @@ void ft_board_setup(void *blob, bd_t *bd)
 	size = getenv_bootm_size();
 
 	fdt_fixup_memory(blob, (u64)base, (u64)size);
+
+#ifdef CONFIG_NAND_U_BOOT
+	do_fixup_by_path_string(fdt, "nor_flash", "status", "disabled");
+	do_fixup_by_path_string(fdt, "nand_flash", "status", "okay");
+#endif
 }
 #endif
-- 
1.5.6.5