Re: Any UBIFS volume image installation command with selective ECC (DTB) in Linux?

From: Jupiter <jupiter.hce@gmail.com>
To: linux-mtd <linux-mtd@lists.infradead.org>
Subject: Re: Any UBIFS volume image installation command with selective ECC (DTB) in Linux?
Date: Fri, 15 May 2020 11:16:15 +1000	[thread overview]
Message-ID: <CAA=hcWTTD3uLOq91GAAm6GXvAmQrDbhd6Jxj2EMH40O8n9ExoA@mail.gmail.com> (raw)
In-Reply-To: <CAA=hcWT7eQ5nXjqRyOG7jaH=K8OEa5w_AwbB_fTJ6JdM-=YDeg@mail.gmail.com>

Seems I am not alone for this issue, found the comments from following
link https://community.nxp.com/thread/324502 6 years ago, it is not
exactly the same to my issue, but are there any new development to
decouple the MTD UBI ECC with u-boot ECC?

"It definitely looks as if the Linux MTD's ECC doesn't agree with the
U-Boot ECC.  For instance, I have the same message if I write a UBI
partition with Software-ECC and then mount with Hardware-ECC. Here is
some conversation with Stefan Agner and I

http://lists.infradead.org/pipermail/linux-mtd/2014-April/053553.html
http://lists.infradead.org/pipermail/linux-mtd/2014-April/053560.html
http://lists.infradead.org/pipermail/linux-mtd/2014-April/053570.html
............
"

Thank you.

Kind regards,

- j

On 5/14/20, Jupiter <jupiter.hce@gmail.com> wrote:
> Hi,
>
> I used ubinize to build a UBIFS image ubi.img, the image has three
> volumes, dtb-volume (imx6ulz.dtb), kernel-volume and rootfs-volume.
>
> To install u-boot and root UBIFS image to iMX6ULL NAND, I used a
> zImage-initramfs to install the u-boot to u-boot mtd partition first,
> then to install ubi.img in UBIFS partition by running following
> commands:
>
> flash_erase /dev/mtd2 0 0
> ubiformat /dev/mtd2 -f /tmp/ubi.img
>
> It was all fine, but after the installation, it cannot run ubi part in
> u-boot:
>
> ubi0 error: ubi_io_read: error -74 (ECC error) while reading 64 bytes from
> PEB 3
> 83:0, read 64 bytes
> ubi0 error: ubi_io_read: error -74 (ECC error) while reading 2048 bytes from
> PEB
>  383:2048, read 2048 bytes
>
> The problem was that u-boot installation requires a higher bit ECC, so
> that zImage-initramfs was started with imx6ulz-kobs.dtb, if I change
> to start  zImage-initramfs with a low bit ECC imx6ulz.dtb, that ECC
> error gone away, but then I could not flash u-boot to NAND.
>
> Are there any way or mtd / ubi command to flash ubi.img to NAND based
> on a specific ECC / dtb?
>
> Appreciate any your kind advice.
>
> Thank you.
>
> Kind regards,
>
> - jupiter
>
>
> --
> "A man can fail many times, but he isn't a failure until he begins to
> blame somebody else."
> -- John Burroughs
>

-- 
"A man can fail many times, but he isn't a failure until he begins to
blame somebody else."
-- John Burroughs

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