UM0851 datasheet(136/245 Pages) STMICROELECTRONICS

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Non-volatile memory device drivers

UM0851

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Doc ID 16604 Rev 2

mount -t yaffs2 /dev/mtdblock7 /mnt

time dd if=/dev/zero of=/mnt/file.bin bs=4K count=8192 (Write the file)

umount /mnt

mount -t yaffs2 /dev/mtdblock7 /mnt

time dd if=/mnt/file.bin of=/dev/null bs=4K count=8192 (Read file back)

umount /mnt

mount -t yaffs2 /dev/mtdblock7 /mnt

rm /mnt/file.bin

umount /mnt

10. Repeat for bs = 8, 16, 32, 64K and count=4096, 2048, 1024, 512.

Figure 34.

NAND memory performance (yaffs2 type)

Results for JFFS2

In JFFS2, compression is on by default. This causes the writing of data, which is uniform, to

finish in much less time. Therefore compression was disabled from config.

Mount JFFS2 fs and write/read to a file. The sequence is as follows:

Table 37.

Results on SPEAr600

Block size in

Kbytes

File size in

Duration

(seconds)

in write

Mega

byte/sec in

write

Duration

(seconds)

in read

Mega

byte/sec in

read

49.5

21.9

0.64

1.46

49.7

21.9

0.64

1.46

49.6

21.9

0.64

1.46

49.3

21.9

0.65

1.46

49.6

21.9

0.64

1.46

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