2008-06-09 23:26:12     MTD of VFAT writing speed

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2008-06-09 23:26:12     MTD of VFAT writing speed

戈 杨 (CHINA)

Message: 56887   

 

I have blackfin board running uClinux, writng files to nand flash, the file system is Vfat, I find the writng speed is too slow, about 50KB/s, I checked  the driver file bfin_nand.c , but find no problem. the normal speed must be more than 200kB/s, can you give me some help? thank you!

 

bfin_nand.c

nand_base.c

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2008-06-09 23:37:40     Re: MTD of VFAT writing speed

Mike Frysinger (UNITED STATES)

Message: 56888   

 

you should not be using VFAT on flash devices ... it's a horrible filesystem for flash

 

use a real filesystem like yaffs2

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2008-06-10 00:15:55     Re: MTD of VFAT writing speed

戈 杨 (CHINA)

Message: 56889   

 

I know, but for the covienence for  the windows, we must use vFAT

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2008-06-10 00:27:01     Re: MTD of VFAT writing speed

Mike Frysinger (UNITED STATES)

Message: 56890   

 

that doesnt really make sense ... windows cannot access nand devices directly

 

it also isnt usable ... vfat does not do bad block handling which nand requires

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2008-06-10 04:47:37     Re: MTD of VFAT writing speed

戈 杨 (CHINA)

Message: 56912   

 

if I use yaff, how can I copy this file in WINXP ,  I  must write and install a windows driver.... 

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2008-06-10 05:00:19     Re: MTD of VFAT writing speed

Zhi Qiang Zhang (CHINA)

Message: 56914   

 

How can you copy files between BFIN board and WINXP while your board using VFAT?

 

 

 

Regards,

 

ZhangZQ

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2008-06-10 05:10:13     Re: MTD of VFAT writing speed

戈 杨 (CHINA)

Message: 56916   

 

It is realized by USB and VFAT , but the speed is too slow

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2008-06-10 05:18:11     Re: MTD of VFAT writing speed

Andrea Federico Grisotto (ITALY)

Message: 56918   

 

if you want to transfer files with the usb take a look at these documents:

 

http://blackfin.uclinux.org/gf/project/linux-kernel/scmsvn/?action=browse&path=%2Ftrunk%2FDocumentation%2Fusb%2Fgadget_serial.txt&revision=1317&view=markup

 

http://docs.blackfin.uclinux.org/doku.php

 

or search in http://docs.blackfin.uclinux.org/doku.php using the word "gadget"

 

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2008-06-10 08:02:47     Re: MTD of VFAT writing speed

Robin Getz (UNITED STATES)

Message: 56925   

 

戈 杨

 

I'm trying to understand your system: Filesystem on NAND, which is exposed to Windows as mass storage over USB?

 

Or you want to run file system on USB memory stick?

 

-Robin

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