[U-Boot] [PATCH] libfdt: Add option to disable arch_fixup_fdt() calls

[Alexander Graf <agraf@suse.de>]

On 06/09/2016 04:23 PM, Michal Simek wrote:
> Disable arch_fixup_fdt() calls for cases where U-Boot shouldn't update
> memory setup in DTB file.
> One example of usage of this option is to boot OS with different memory
> setup than U-Boot use.
>
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>

Could we instead just have the board file provide a fixup? It could then 
also fix up the efi memory map.


Alex

> ---
>
>   Kconfig                  | 8 ++++++++
>   arch/arm/lib/bootm-fdt.c | 2 ++
>   common/image-fdt.c       | 3 +++
>   3 files changed, 13 insertions(+)
>
> diff --git a/Kconfig b/Kconfig
> index 4b4621666560..3efba624ecff 100644
> --- a/Kconfig
> +++ b/Kconfig
> @@ -291,6 +291,14 @@ config SYS_CLK_FREQ
>   	help
>   	  TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
>   
> +config DISABLE_ARCH_FIXUP_FDT
> +	bool "Disable arch_fixup_fdt() call"
> +	depends on ARM
> +	help
> +	  Disable FDT memory map syncup before OS boot. This feature can be
> +	  used for booting OS with different memory setup where the part of
> +	  the memory location should be used for different purpose.
> +
>   endmenu		# Boot images
>   
>   source "common/Kconfig"
> diff --git a/arch/arm/lib/bootm-fdt.c b/arch/arm/lib/bootm-fdt.c
> index 7677358742e1..a873b778ade9 100644
> --- a/arch/arm/lib/bootm-fdt.c
> +++ b/arch/arm/lib/bootm-fdt.c
> @@ -24,6 +24,7 @@
>   
>   DECLARE_GLOBAL_DATA_PTR;
>   
> +#ifndef CONFIG_DISABLE_ARCH_FIXUP_FDT
>   int arch_fixup_fdt(void *blob)
>   {
>   	bd_t *bd = gd->bd;
> @@ -50,3 +51,4 @@ int arch_fixup_fdt(void *blob)
>   #endif
>   	return ret;
>   }
> +#endif
> diff --git a/common/image-fdt.c b/common/image-fdt.c
> index 6cac7dbb7f8b..9e05becd464a 100644
> --- a/common/image-fdt.c
> +++ b/common/image-fdt.c
> @@ -460,6 +460,9 @@ __weak int ft_verify_fdt(void *fdt)
>   
>   __weak int arch_fixup_fdt(void *blob)
>   {
> +#ifdef CONFIG_DISABLE_ARCH_FIXUP_FDT
> +	printf("## Disable arch_fixup_fdt()\n");
> +#endif
>   	return 0;
>   }
>