linux-kernel - Re: [PATCH v2 1/1] powerpc/86xx: Add support for Emerson/Artesyn MVME7100

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Date:	Mon, 18 Apr 2016 23:26:21 -0500
From:	Scott Wood <oss@...error.net>
To:	Alessio Igor Bogani <alessio.bogani@...ttra.eu>,
	Kumar Gala <galak@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] powerpc/86xx: Add support for Emerson/Artesyn
 MVME7100

On Mon, 2016-04-18 at 09:57 +0200, Alessio Igor Bogani wrote:
> +	pci0: pcie@...08000 {
> +		reg = <0xf1008000 0x1000>;
> +		ranges = <0x02000000 0x0 0x80000000 0x80000000 0x0
> 0x50000000
> +			  0x01000000 0x0 0x00000000 0xf0000000 0x0
> 0x00800000>;
> +		pcie@0 {
> +			ranges = <0x02000000 0x0 0x80000000
> +				  0x02000000 0x0 0x80000000
> +				  0x0 0x50000000
> +
> +				  0x01000000 0x0 0x00000000
> +				  0x01000000 0x0 0x00000000
> +				  0x0 0x00800000>;
> +		};
> +	};
> +
> +	pci1: pcie@...09000 {
> +		compatible = "fsl,mpc8641-pcie";
> +		device_type = "pci";
> +		#size-cells = <2>;
> +		#address-cells = <3>;
> +		reg = <0xf1009000 0x1000>;
> +		bus-range = <0 0xff>;

Why are pci0 and pci1 so different?  Why does mpc8641si-post.dtsi not have
pci1?

> +asm("	.globl _zimage_start\n\
> +	_zimage_start:\n\
> +		mfmsr   10\n\
> +		rlwinm  10,10,0,~(1<<15)        /* Clear MSR_EE */\n\
> +		sync\n\
> +		mtmsr   10\n\
> +		isync\n\
> +		b _zimage_start_lib\n\
> +");

Please put this in an asm file.

Is U-Boot really not clearing MSR[EE]?  How old is this U-Boot?

> diff --git a/arch/powerpc/boot/ppcboot.h b/arch/powerpc/boot/ppcboot.h
> index 6ae6f90..7b758be 100644
> --- a/arch/powerpc/boot/ppcboot.h
> +++ b/arch/powerpc/boot/ppcboot.h
> @@ -43,7 +43,7 @@ typedef struct bd_info {
>  	unsigned long	bi_sramstart;	/* start of SRAM memory
> */
>  	unsigned long	bi_sramsize;	/* size	 of SRAM
> memory */
>  #if defined(TARGET_8xx) || defined(TARGET_CPM2) || defined(TARGET_85xx) ||\
> -	defined(TARGET_83xx)
> +	defined(TARGET_83xx) || defined(TARGET_MVME7100)
>  	unsigned long	bi_immr_base;	/* base of IMMR register
> */
>  #endif

TARGET_86xx would match the U-Boot definition better.

> +/*
> + * Called very early, device-tree isn't unflattened
> + */
> +static int __init mvme7100_probe(void)
> +{
> +	unsigned long root = of_get_flat_dt_root();
> +
> +	if (!of_flat_dt_is_compatible(root, "artesyn,MVME7100"))
> +		return 0;
> +
> +	_set_L2CR(_get_L2CR() | L2CR_L2E);
> +	return 1;
> +}

U-Boot doesn't enable L2 cache?

-Scott