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

[Qianyu Gong]

Hi York,

> -----Original Message-----
> From: York Sun [mailto:york.sun at nxp.com]
> Sent: Tuesday, May 17, 2016 12:47 AM
> To: Qianyu Gong <qianyu.gong at nxp.com>; u-boot at lists.denx.de;
> oss at buserror.net
> Cc: Mingkai Hu <mingkai.hu at nxp.com>
> Subject: Re: [Patch v2] fsl-layerscape: fdt: add IFC fixup if no IFC is avaliable in U-
> Boot
> 
> 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 at 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

For LS1043AQDS, IFC is disabled at board level(at SoC level, only IFC NOR is disabled).
Yes, I can detect if IFC is enabled by checking QIXIS registers.

Regards,
Qianyu