linux-kernel - Re: [PATCH 2/2] arc: hsdk_defconfig: enable CONFIG_ARC_UBOOT

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Date:   Tue, 5 Feb 2019 11:42:12 +0000
From:   Eugeniy Paltsev <eugeniy.paltsev@...opsys.com>
To:     "vineet.gupta1@...opsys.com" <vineet.gupta1@...opsys.com>,
        "clabbe@...libre.com" <clabbe@...libre.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alexey.brodkin@...opsys.com" <alexey.brodkin@...opsys.com>,
        "khilman@...libre.com" <khilman@...libre.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH 2/2] arc: hsdk_defconfig: enable CONFIG_ARC_UBOOT_SUPPORT

Hi Corentin,

In case of devboards (like HSDK) we really often disable bootloader and load
Linux image in memory via JTAG. Enabling CONFIG_ARC_UBOOT_SUPPORT by
default will break it as we will try to interpret some junk in a registers
as a pointers to bootargs/etc which aren't set by anyone in case of JTAG using.

So it isn't a good idea to have CONFIG_ARC_UBOOT_SUPPORT enabled by default.

On Tue, 2019-02-05 at 08:32 +0000, Corentin Labbe wrote:
> We have now a HSDK device in our kernelci lab, but kernel builded via
> the hsdk_defconfig ignore bootargs, so it cannot boot kernelci jobs yet.
> Furthermore, I think the probability is that devices will be booted more via
> uboot than by a debugger.
> 
> So this patch enable CONFIG_ARC_UBOOT_SUPPORT in hsdk_defconfig.
> 
> Signed-off-by: Corentin Labbe <clabbe@...libre.com>
> ---
>  arch/arc/configs/hsdk_defconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arc/configs/hsdk_defconfig b/arch/arc/configs/hsdk_defconfig
> index 0e5fd29ed238..b80e3ac5c93c 100644
> --- a/arch/arc/configs/hsdk_defconfig
> +++ b/arch/arc/configs/hsdk_defconfig
> @@ -9,6 +9,7 @@ CONFIG_NAMESPACES=y
>  # CONFIG_PID_NS is not set
>  CONFIG_BLK_DEV_INITRD=y
>  CONFIG_BLK_DEV_RAM=y
> +CONFIG_ARC_UBOOT_SUPPORT=y
>  CONFIG_EMBEDDED=y
>  CONFIG_PERF_EVENTS=y
>  # CONFIG_VM_EVENT_COUNTERS is not set
-- 
 Eugeniy Paltsev