UM0851 datasheet(137/245 Pages) STMICROELECTRONICS

Part #	UM0851

Description	SPEAr is a family of highly customizable ARM-based embedded

PDF	245 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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137 / 245 page

UM0851

Non-volatile memory device drivers

Doc ID 16604 Rev 2

137/245

mount –t jffs2 /dev/mtdblock7 /mnt

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

file)

umount /mnt

mount –t jffs2 /dev/mtdblock7 /mnt

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

Read file back)

umount /mnt

mount –t jffs2 /dev/mtdblock7 /mnt

10. rm /mnt/file.bin

11. umount /mnt

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

Figure 35.

NAND memory performance (jffs2 type)

Table 38.

Results on SPEAr600

Block size

in Kbytes

File size

in MB

Duration

(seconds)

in write

Mega

byte/sec in

write

Duration

(seconds)

in read

Mega byte/sec in

read

22.311

1.434270091

17.92

1.785714286

22.127

1.446196954

14.984

2.135611319

22.129

1.446066248

17.59

1.819215463

21.933

1.458988738

17.506

1.827944705

22.03

1.452564685

17.462

1.832550681

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