Richard On 07/25/2016 04:01 PM, Richard Weinberger wrote:
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.
Could you please pass the link Thanks in advance ~Rajeev
Thanks, //richard
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