linux-kernel - Re: [PATCH 2/6] MIPS: Loongson64: Distinguish firmware dependencies DTB/LEFI.

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Date:   Tue, 9 Feb 2021 16:38:43 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Qing Zhang <zhangqing@...ngson.cn>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Xingxing Su <suxingxing@...ngson.cn>
Subject: Re: [PATCH 2/6] MIPS: Loongson64: Distinguish firmware dependencies
 DTB/LEFI.

On Tue, Feb 09, 2021 at 05:32:20PM +0800, Qing Zhang wrote:
> Add DTB boot support, only support LS2K1000 processor for now,
> determine whether to use the built-in DTB or the DTB from the
> firmware by checking the range of CKSEG0 and XKPHYS.
> 
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> Signed-off-by: Qing Zhang <zhangqing@...ngson.cn>
> Signed-off-by: Xingxing Su <suxingxing@...ngson.cn>
> ---
>  .../include/asm/mach-loongson64/boot_param.h     |  6 ++++++
>  arch/mips/include/asm/mach-loongson64/loongson.h |  3 ++-
>  arch/mips/loongson64/env.c                       | 13 ++++++++++++-
>  arch/mips/loongson64/init.c                      | 16 ++++++++++++++--
>  4 files changed, 34 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/mips/include/asm/mach-loongson64/boot_param.h b/arch/mips/include/asm/mach-loongson64/boot_param.h
> index 4592841b6b0c..53c29a305ff0 100644
> --- a/arch/mips/include/asm/mach-loongson64/boot_param.h
> +++ b/arch/mips/include/asm/mach-loongson64/boot_param.h
> @@ -198,7 +198,13 @@ enum loongson_bridge_type {
>  	VIRTUAL = 3
>  };
>  
> +enum loongson_fw_interface {
> +	LOONGSON_LEFI = 0,
> +	LOONGSON_DTB = 1,
> +};
> +
>  struct loongson_system_configuration {
> +	enum loongson_fw_interface fw_interface;

do you need this for future use ? Right now this information is only
needed in init.c and doesn't need to be exported...

> +	if (fw_arg2 == 0 || (be32_to_cpup((__be32 *)fw_arg2) == OF_DT_HEADER)) {

what about using fdt_magic(fw_arg2) == FDT_MAGIC ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]