On 09/17/2013 04:38 AM, Rob Herring wrote:
> From: Rob Herring <rob.herring-bsGFqQB8/dxbdgjk7y7...@public.gmane.org>
>
> Several architectures using DT support built-in dtb's in the init
> section. These platforms need to copy the dtb from init since the
> strings are referenced after unflattening. Every arch has their own
> copying routine which do the same thing. Create a common function,
> unflatten_and_copy_device_tree, to copy the dtb when unflattening the
> dtb.
>
> Signed-off-by: Rob Herring
> <rob.herring-bsGFqQB8/dxbdgjk7y7...@public.gmane.org>
> Cc: Grant Likely <grant.likely-qsej5fyqhm4dnm+yrof...@public.gmane.org>
> ---
> drivers/of/fdt.c | 13 +++++++++++++
> include/linux/of_fdt.h | 2 ++
> 2 files changed, 15 insertions(+)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 229dd9d..eca1810 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -802,6 +802,19 @@ void __init unflatten_device_tree(void)
> of_alias_scan(early_init_dt_alloc_memory_arch);
> }
>
> +void __init unflatten_and_copy_device_tree(void)
> +{
Can we add a comment here why exactly is the copy needed (unflattening doesn't
copy strings which are referenced to by the DT APIs). Will help first time
readers.
> + int size = __be32_to_cpu(initial_boot_params->totalsize);
> + void *dt = early_init_dt_alloc_memory_arch(size,
> + __alignof__(struct boot_param_header));
> +
> + if (dt) {
> + memcpy(dt, initial_boot_params, size);
> + initial_boot_params = dt;
> + }
> + unflatten_device_tree();
> +}
> +
> #endif /* CONFIG_OF_EARLY_FLATTREE */
>
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