root@sama5d3-xplained-sd:~# modprobe mtd_stresstest dev=5 count=100000

=================================================
mtd_stresstest: MTD device: 5
mtd_stresstest: MTD device size 260046848, eraseblock size 131072, page size 2048, count of eraseblocks 1984, pages per eraseblock 64, OOB size 64
mtd_test: scanning for bad eraseblocks
mtd_test: block 36 is bad
mtd_test: block 37 is bad
mtd_test: block 1980 is bad
mtd_test: block 1981 is bad
mtd_test: block 1982 is bad
mtd_test: block 1983 is bad
mtd_test: scanned 1984 eraseblocks, 6 are bad
mtd_stresstest: doing operations
mtd_stresstest: 0 operations done
mtd_stresstest: 1024 operations done
mtd_stresstest: 2048 operations done
mtd_stresstest: 3072 operations done
mtd_stresstest: 4096 operations done
mtd_stresstest: 5120 operations done
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mtd_stresstest: 7168 operations done
mtd_stresstest: 8192 operations done
mtd_stresstest: 9216 operations done
mtd_stresstest: 10240 operations done
mtd_stresstest: 11264 operations done
mtd_stresstest: 12288 operations done
mtd_stresstest: 13312 operations done
mtd_stresstest: 14336 operations done
mtd_stresstest: 15360 operations done
mtd_stresstest: 16384 operations done
mtd_stresstest: 17408 operations done
mtd_stresstest: 18432 operations done
mtd_stresstest: 19456 operations done
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mtd_stresstest: 24576 operations done
mtd_stresstest: 25600 operations done
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mtd_stresstest: 34816 operations done
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mtd_stresstest: 37888 operations done
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mtd_stresstest: 40960 operations done
mtd_stresstest: 41984 operations done
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mtd_stresstest: 63488 operations done
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mtd_stresstest: 65536 operations done
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mtd_stresstest: 68608 operations done
mtd_stresstest: 69632 operations done
mtd_stresstest: 70656 operations done
mtd_stresstest: 71680 operations done
mtd_stresstest: 72704 operations done
mtd_stresstest: 73728 operations done
mtd_stresstest: 74752 operations done
mtd_stresstest: 75776 operations done
mtd_stresstest: 76800 operations done
mtd_stresstest: 77824 operations done
mtd_stresstest: 78848 operations done
mtd_stresstest: 79872 operations done
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mtd_stresstest: 81920 operations done
mtd_stresstest: 82944 operations done
mtd_stresstest: 83968 operations done
mtd_stresstest: 84992 operations done
mtd_stresstest: 86016 operations done
mtd_stresstest: 87040 operations done
mtd_stresstest: 88064 operations done
mtd_stresstest: 89088 operations done
mtd_stresstest: 90112 operations done
mtd_stresstest: 91136 operations done
mtd_stresstest: 92160 operations done
mtd_stresstest: 93184 operations done
mtd_stresstest: 94208 operations done
mtd_stresstest: 95232 operations done
mtd_stresstest: 96256 operations done
mtd_stresstest: 97280 operations done
mtd_stresstest: 98304 operations done
mtd_stresstest: 99328 operations done
mtd_stresstest: finished, 100000 operations done
=================================================
root@sama5d3-xplained-sd:~# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00040000 00020000 "bootstrap"
mtd1: 000c0000 00020000 "uboot"
mtd2: 00040000 00020000 "env_redundant"
mtd3: 00040000 00020000 "env"
mtd4: 00680000 00020000 "itb"
mtd5: 0f800000 00020000 "rootfs"
root@sama5d3-xplained-sd:~# mtd_info /dev/mtd5
-sh: mtd_info: command not found
root@sama5d3-xplained-sd:~# mtd_debug info /dev/mtd5
mtd.type = MTD_NANDFLASH
mtd.flags = MTD_CAP_NANDFLASH
mtd.size = 260046848 (248M)
mtd.erasesize = 131072 (128K)
mtd.writesize = 2048 (2K)
mtd.oobsize = 64
regions = 0

root@sama5d3-xplained-sd:~#