Hi,
After flashing the NAND drive with a native OpenWRT image, I get a long list of complaints about Bad EC magic blocks. Just over a thousand blocks appear to be bad.
NOTICE: SPI_NAND Detected ID 0xef
NOTICE: Page size 2048, Block size 131072, size 268435456
NOTICE: UBI: scanning [0x200000 - 0x10000000] ...
NOTICE: UBI: Bad EC magic in block 1008 ffffffff
.
.
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NOTICE: UBI: Bad EC magic in block 2010 ffffffff
No size specified -> Using max size (22474752)
I find this disturbing to be sure. But truthfully I’m not sure what it means:
- Is the NAND damaged?
- Was there a problem with the flashing process?
- Is 1000 bad blocks a drop in the bucket, and so nothing to worry about?
Of note, dmesg seems to report PEBs are all good.
root@OpenWrt:~# dmesg | grep bad
[ 1.677758] ubi0: good PEBs: 1008, bad PEBs: 0, corrupted PEBs: 0
[ 1.699391] ubi0: available PEBs: 0, total reserved PEBs: 1008, PEBs reserved for bad PEB handling:
Can anyone shed some light on these messages?
Many thanks,