Rajeev,
Am 25.07.2016 um 11:46 schrieb Rajeev Kumar:
> If the master mtd does not have any slave mtd partitions,
> and its numeraseregions is one(only has one erease block), and
> we attach the master mtd with : ubiattach -m 0 -d 0
>
> We will meet the error:
> -------------------------------------------------------
> root ~$ ubiattach /dev/ubi_ctrl -m 0 -d 0
> UBI: attaching mtd0 to ubi0
> UBI error: io_init: multiple regions, not implemented
> ubiattach: error!: cannot attach mtd0
> error 22 (Invalid argument)
> -------------------------------------------------------
>
> In fact, if there is only one "erase block", we should not
> prevent the attach.
>
> This patch is tested against 3.14 kernel and only build test is
> performed against current upstream master branch.
The more interesting question is, why is ->numeraseregions not 0?
The comment in the header says:
/* Data for variable erase regions. If numeraseregions is zero,
* it means that the whole device has erasesize as given above.
*/
So, if your MTD erase regions with the same size, it should be 0.
IIRC we had such a discussion already on linux-mtd and it was not clear
whether numeraseregions of 0 and 1 are equal or not.
Thanks,
//richard
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