linux-kernel - RE: [PATCH 2/2] arch: arm64: configs: Enable UBI and UBIFS

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Date:   Fri, 23 Jun 2023 10:03:57 +0000
From:   "Lee, Kah Jing" <kah.jing.lee@...el.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/2] arch: arm64: configs: Enable UBI and UBIFS

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Thursday, 22 June, 2023 8:49 PM
> To: Lee, Kah Jing <kah.jing.lee@...el.com>; Dinh Nguyen
> <dinguyen@...nel.org>; Rob Herring <robh+dt@...nel.org>; Krzysztof
> Kozlowski <krzysztof.kozlowski+dt@...aro.org>; Conor Dooley
> <conor+dt@...nel.org>; Catalin Marinas <catalin.marinas@....com>; Will
> Deacon <will@...nel.org>
> Cc: linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 2/2] arch: arm64: configs: Enable UBI and UBIFS
> 
> On 22/06/2023 14:21, kah.jing.lee@...el.com wrote:
> > From: Lee, Kah Jing <kah.jing.lee@...el.com>
> >
> >>
> 
> You missed my questions.
Sorry, the reply got truncated.

> > On 22/06/2023 10:53, kah.jing.lee@...el.com wrote:
> > From: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi@...el.com>
> > 
> > This patch is to enable UBI and UBIFS in Linux defconfig.
> Why? Which board needs it? It's quite unusual to have this on arm64...
The ubifs settings is enabled for Agilex and Stratix10 socfpga platform with 
rootfs mounted from QSPI NOR.
> >>>
> >>> Signed-off-by: Alif Zakuan Yuslaimi <alif.zakuan.yuslaimi@...el.com>
> >>> Signed-off-by: Kah Jing Lee <kah.jing.lee@...el.com>
> >>> ---
> >>>  arch/arm64/configs/defconfig | 2 ++
> >>>  1 file changed, 2 insertions(+)
> >>>
> >>> diff --git a/arch/arm64/configs/defconfig
> >>> b/arch/arm64/configs/defconfig index a24609e14d50..23a6ebcb1a9e
> >> 100644
> >>> --- a/arch/arm64/configs/defconfig
> >>> +++ b/arch/arm64/configs/defconfig
> >>> @@ -470,6 +470,8 @@ CONFIG_IPMI_DEVICE_INTERFACE=m
> >> CONFIG_IPMI_SI=m
> >>> CONFIG_HW_RANDOM=y  CONFIG_HW_RANDOM_VIRTIO=y
> >>> +CONFIG_MTD_UBI=y
> >>> +CONFIG_UBIFS_FS=y
> >>
> >> Not modules?
> > Yes, we need to boot with rootfs with UBIFS.
> 
> So you miss init ramdisk.
Currently we are using the bootargs to mount the rootfs from QSPI NOR flash:
[    0.000000] Kernel command line: earlycon panic=-1 ubi.mtd=1 root=ubi0:rootfs rootfstype=ubifs rw rootwait
Is it possible to mount the ubifs rootfs with the ubifs=m config during boot?
Thanks.
> 
> 
> 
> Best regards,
> Krzysztof

Thanks. 

Regards, 
Lee, Kah Jing