Could someone tell me if the fastmap feature in ubi is stable for use in production?

Ezequiel Garcia ezequiel at
Wed Apr 11 08:08:43 PDT 2018

Wang, Qiong (Q.),

On 9 April 2018 at 07:55, Richard Weinberger
<richard.weinberger at> wrote:
> Wang, Qiong (Q.),
> On Mon, Apr 9, 2018 at 12:25 PM, Wang, Qiong (Q.) <qwang34 at> wrote:
>> Hi experts,
>> I have found the below link in the linux-mtd website explaining fastmap feature in ubi.
>> Our project uses large nand flash and I found that fastmap can reduce the ubi attach process to the time we want. Our concern is, since it is an experimental, is it stable to use in our project? Are there any reported issue of this feature?Our biggest worry is that can it possibly brick our system during the boot up process.

For what it's worth, I've used UBI fastmap in production, and so far
we didn't have

Note that we prepared a lot of tests, based on our particular use
case. If I remember
correctly, we hit one bug and Richard was kind enough to fix it in a few hours.

So my advise is: use it, but by all means test it. As anything else.

Hope it helps,

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