linux-kernel - Re: [PATCH] arm64: defconfig: enable EFI_ARMSTUB_DTB

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Message-ID: <fb07b89d-d427-5e59-9f17-b12df26284ec@broadcom.com>
Date:   Wed, 29 Aug 2018 11:59:36 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Olof Johansson <olof@...om.net>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: defconfig: enable EFI_ARMSTUB_DTB_LOADER

Hi Olof,


On 18-08-29 11:44 AM, Olof Johansson wrote:
> Hi,
>
> On Wed, Aug 29, 2018 at 10:21 AM, Scott Branden
> <scott.branden@...adcom.com> wrote:
>> Enable EFI_ARMSTUB_DTB_LOADER to add support for the dtb= command line
>> parameter to function with efi loader.
>>
>> Required to boot on existing bootloaders that do not support devicetree
>> provided by the platform or by the bootloader.
>>
>> Fixes: 3d7ee348aa41 ("efi/libstub/arm: Add opt-in Kconfig option for the DTB loader")
>> Signed-off-by: Scott Branden <scott.branden@...adcom.com>
> Why did Ard create an option for this if it's just going be turned on
> in default configs? Doesn't make sense to me.
>
> It would help to know what firmware still is crippled and how common
> it is, since it's been a few years that this has been a requirement by
> now.
Broadcom NS2 and Stingray in current development and production need 
this option in the kernel enabled in order to boot.
>
>
> -Olof