OPENWRT 22.03 ramdrive. target ipq807x Yuncore ax880
ubiattach -m 0
[   96.073350] ubi0: attaching mtd0
[   96.298474] ubi0: scanning is finished
[   96.304474] ubi0: attached mtd0 (name "rootfs", size 52 MiB)
[   96.304506] ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
[   96.309201] ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 2048
[   96.315919] ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096
[   96.322739] ubi0: good PEBs: 415, bad PEBs: 1, corrupted PEBs: 0
[   96.329534] ubi0: user volume: 3, internal volumes: 1, max. volumes count: 128
[   96.335770] ubi0: max/mean erase counter: 2/0, WL threshold: 4096, image sequence number: 1646124
[   96.342794] ubi0: available PEBs: 0, total reserved PEBs: 415, PEBs reserved for bad PEB handlin9
[   96.352127] ubi0: background thread "ubi_bgt0d" started, PID 4958
UBI device number 0, total 415 LEBs (52695040 bytes, 50.2 MiB), available 0 LEBs (0 bytes), LEB siz)

Openwrt 23.05 ramdrive. target ipq807x Yuncore ax880

ubiattach -m 0
[  166.578056] ubi0: attaching mtd0
[  166.802937] ubi0: scanning is finished
[  166.809180] ubi0: attached mtd0 (name "rootfs", size 52 MiB)
[  166.809222] ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
[  166.813915] ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 2048
[  166.820630] ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096
[  166.827469] ubi0: good PEBs: 415, bad PEBs: 1, corrupted PEBs: 0
[  166.834225] ubi0: user volume: 4, internal volumes: 1, max. volumes count: 128
[  166.840487] ubi0: max/mean erase counter: 3/0, WL threshold: 4096, image sequence number: 1659980
[  166.847520] ubi0: available PEBs: 0, total reserved PEBs: 415, PEBs reserved for bad PEB handlin9
[  166.856474] ubi0: background thread "ubi_bgt0d" started, PID 5055
UBI device number 0, total 415 LEBs (52695040 bytes, 50.2 MiB), available 0 LEBs (0 bytes), LEB siz)