linux-kernel - Re: qemu: arm: mounting ubifs using nandsim on busybox

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Date:   Thu, 10 Jun 2021 15:52:32 +0200 (CEST)
From:   Richard Weinberger <richard@....at>
To:     Pintu Agarwal <pintu.ping@...il.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: Re: qemu: arm: mounting ubifs using nandsim on busybox

Pintu,

----- Ursprüngliche Mail -----
> Von: "Pintu Agarwal" <pintu.ping@...il.com>
>> nandsim works as expected. It creates a new and *erased* NAND for you.
>> So you have no UBI volumes. Therfore UBIFS cannot be mounted.
>> I suggest creating a tiny initramfs that creates UBI volumes before mounting
>> UBIFS on
>> one of the freshly created (and empty) volumes.
>>
> oh sorry I forgot to mention this.
> I am able to create and update volumes manually after booting the
> system with initramfs.
> {{{
> Creating rootfs volume:
> mknod /dev/ubi0 c 250 0
> mknod /dev/ubi0_0 c 250 1
> ubiattach /dev/ubi_ctrl -m 2
> ubimkvol /dev/ubi0 -N rootfs -m
> ubiupdatevol /dev/ubi0_0 ubifs-rootfs.img
> mount -t ubifs ubi0:rootfs ubi-root/
> }}}
> 
> But I wanted to do all these automatically during boot time itself.
> Also I wanted to use ubinize.cfg as is from the original system and
> simulate everything using qemu and nadsim (if possible)
> So I thought it must be possible by setting some parameters in qemu such as:
> mtdparts=nand:,
> -device nand,chip_id=0x39,drive=mtd0,
> -drive if=mtd,file=./ubi-boot.img,id=mtd0,
> anything else ?

Well, this has nothing to do with nandsim.
If qemu can emulate a NAND chip (plus a controller) all you need is a driver on the Linux side.

Thanks,
//richrd