/ # nandtest -k /dev/mtd11
[   24.676487] mtd_open++
[   24.678993] mtd_open--
ECC corrections: 0
ECC failures   : 0
Bad blocks     : 0
BBT blocks     : 0
01d20000: writing... 
write: Input/output error
02960000: reading... 
ECC corrected at 02960000
06560000: checking...
Finished[  212.962710] mtd_close++
 pass 1 successf[  212.966406] mtd_close--
ully
/ # nandtest -k /dev/mtd11 -l 0x3000000
[  239.722362] mtd_open++
[  239.724927] mtd_open--
ECC corrections: 19
ECC failures   : 0
Bad blocks     : 0
BBT blocks     : 0
01d20000: writing... 
write: Input/output error
01d40000: reading... 
ECC corrected at 01d40000
02960000: reading... 
ECC corrected at 02960000
02fe0000: checking...
Finished[  328.794125] mtd_close++
 pass 1 successf[  328.797844] mtd_close--