ubi2 error: scan_pool: unable to read EC header! PEB:569 err:1

[Richard Weinberger]

----- Ursprüngliche Mail -----
> Von: "Rickard X Andersson" <Rickard.Andersson at axis.com>
> An: "linux-mtd" <linux-mtd at lists.infradead.org>, "Artem Bityutskiy" <dedekind1 at gmail.com>, "richard" <richard at nod.at>,
> "Richard Weinberger" <richard.weinberger at gmail.com>
> Gesendet: Mittwoch, 12. Januar 2022 11:54:01
> Betreff: ubi2 error: scan_pool: unable to read EC header! PEB:569 err:1

> Hi,
> 
> After a firmware upgrade the following error is reported by testers after
> reboot:
> 
> [    8.017720][  T306] ubi2 error: scan_pool: unable to read EC header! PEB:569
> err:1
> [    8.017900][  T306] ubi2 error: ubi_scan_fastmap: Attach by fastmap failed,
> doing a full scan!

1 is UBI_IO_FF. So a fastmap pool points to a freshly erased block.
 
> Is this something we need to take some action to solve or is it unharmful?
> Everything seems to work as normal.

Looks like erasing a PEB was interrupted (by a power-cut) before UBI had a chance to
write an EC header to it and Fastmap being paranoid refused to do a fast attach.

After that event, did everything work again and Fastmap is happy?

Thanks,
//richard