[U-Boot] [Patch v2] fsl-layerscape: fdt: add IFC fixup if no IFC is avaliable in U-Boot

[York Sun <york.sun@nxp.com>]

On 04/27/2016 11:19 PM, Gong Qianyu wrote:
> IFC is considered as a required component in Layerscape platforms' Linux.
> But if IFC is not enabled in U-Boot on some boards, accessing IFC memory
> space would cause kernel call trace. So disable IFC node in such cases.
> 
> Signed-off-by: Gong Qianyu <Qianyu.Gong@nxp.com>
> ---
> V2:
>  - Revised the title and message.
>  - Used #ifndef CONFIG_FSL_IFC rather than #ifdef CONFIG_FSL_QSPI.
> 
>  arch/arm/cpu/armv8/fsl-layerscape/fdt.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
> index 1e875c4..96dab56 100644
> --- a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
> +++ b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
> @@ -98,4 +98,9 @@ void ft_cpu_setup(void *blob, bd_t *bd)
>  #ifdef CONFIG_SYS_DPAA_FMAN
>  	fdt_fixup_fman_firmware(blob);
>  #endif
> +
> +#ifndef CONFIG_FSL_IFC
> +	do_fixup_by_compat(blob, "fsl,ifc",
> +			   "status", "disabled", 8 + 1, 1);
> +#endif
>  }
> 

Qianyu,

For the platforms you are testing, is IFC disabled/enabled at SoC level (eg.
RCW) or board level (eg. FPGA)? Can you detect if IFC is enabled by checking
registers?

York