[U-Boot] [PATCH] nios2: add fdt support

[Scott McNutt <smcnutt@psyent.com>]

Applied to: git://git.denx.de/u-boot-nios.git next
Thanks,
--Scott

Thomas Chou wrote:
> This patch adds fdt support to boot linux, followed Michal's
> work on microblaze.
> 
> Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
> ---
>  arch/nios2/lib/bootm.c |   21 +++++++++++++++++++++
>  1 files changed, 21 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/nios2/lib/bootm.c b/arch/nios2/lib/bootm.c
> index 5d25edf..defa1fc 100644
> --- a/arch/nios2/lib/bootm.c
> +++ b/arch/nios2/lib/bootm.c
> @@ -34,6 +34,18 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
>  	char *commandline = getenv("bootargs");
>  	ulong initrd_start = images->rd_start;
>  	ulong initrd_end = images->rd_end;
> +	char *of_flat_tree = NULL;
> +#if defined(CONFIG_OF_LIBFDT)
> +	ulong of_size = 0;
> +
> +	/* find flattened device tree */
> +	if (boot_get_fdt(flag, argc, argv, images, &of_flat_tree, &of_size))
> +		return 1;
> +#endif
> +	if (!of_flat_tree)
> +		of_flat_tree = (char *)simple_strtoul(argv[3], NULL, 16);
> +	if (of_flat_tree)
> +		initrd_end = (ulong)of_flat_tree;
>  
>  	if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
>  		return 1;
> @@ -45,6 +57,15 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
>  
>  	debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline);
>  	debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end);
> +	/* kernel parameters passing
> +	 * r4 : NIOS magic
> +	 * r5 : initrd start
> +	 * r6 : initrd end or fdt
> +	 * r7 : kernel command line
> +	 * fdt is passed to kernel via r6, the same as initrd_end. fdt will be
> +	 * verified with fdt magic. when both initrd and fdt are used at the
> +	 * same time, fdt must follow immediately after initrd.
> +	 */
>  	kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline);
>  	/* does not return */
>