Re: writing large file in the usb

On Tue, 11 Sep 2007 [email protected] wrote:

> Dear Engineers,
> 
>  When I use the g_file_strogae.ko module, I failed to write big file to
>  the disk.
>  Hardware platform:
>  CPU: ARM926T
>  SDRAM: 32M sdram
>  Kernel:2.6.19.  patch
> 
> 
>  I plug a 512MBytes usb flashdisk(fat32 type) into the board usb host
>  interface, and connect a usb line between the board usb device interface
> and a PC with WinXP OS.
>  In the board side, I use the following command:
>  #> insmod ./g_file_storage.ko file=/fat.fs removable=y
>  where /fat.fs is the external 512MB flash disk.
>  Then in the PC side, XP can recognize the board as a usb mass storage
>  device. And read big file(3Mkbytes) is OK.
>  But when I write a big file(above 30kbytes) into the board from XP side, the
>  speed is very slow and finally failed. (Write a 30KBytes file is OK). In
>  the board side, kernel repeatedly printed following message every
>  several seconds. "g_file_storage gadget: full speed config #1".
>  What's wrong with it? and i have face i/o device error when writing the big file.
> please can you help me.

I have answered your questions already.  Didn't you see my reply?

In order to find out what's going wrong, you must enable debugging in 
the g_file_storage source code.  Near the start of 
drivers/usb/gadget/file_storage.c, change the lines that say

#undef DEBUG
#undef VERBOSE_DEBUG

to

#define DEBUG
#define VERBOSE_DEBUG

and then rebuild the driver.

Alan Stern


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