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Altera_Forum's avatar
Altera_Forum
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20 years ago

Mounting usb flash stick

I am developing a USB IP core, and I am now at the stage where I am attempting to create a uClinux driver.

With the new driver compiled into the kernel, and debug messages enabled, I see the following when I insert a flash stick.

console text (http://www.base2designs.com/console_text.txt)

As far as I can tell, when the flash stick is inserted, it is correctly detected, but then again I'm not too sure what all the messages mean. Could somebody take a look at the console messages, and tell me if there are any problems that I should be investigating.

If all is well, and the flash stick is indeed correctly attached, how do I get read write access. I've read in places that I should add a line to my /etc/fstab file, but I cannot find the fstab file. I tried;

mount -n /dev/sda /mnt/ide0

but no success. 

cat /proc/partitions
major minor # blocks  name
   3     0      62976 hda
   3     1      62960 hda1
  31     0       4096 mtdblock0
  31     1       2048 mtdblock1
  31     2       1024 mtdblock2
  31     3       1024 mtdblock3
   8     0      63488 sda
   8     1      63457 sda1#  mount -n /dev/sda /mnt/ide0
mount -n /dev/sda /mnt/ide0
mount: special device /dev/sda does not exist

14 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    --- Quote Start ---

    originally posted by sfielding@Jun 22 2005, 03:38 PM 

    # mount -n /dev/sda /mnt/ide0
mount -n /dev/sda /mnt/ide0
mount: special device /dev/sda does not exist

    --- Quote End ---

    You need to mount the partition, not the device, try 

    mount -n -t vfat /dev/sda1 /mnt/usb
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    Thanks marc, that helped.

    It turned out that I also needed to add some nodes to the filesystem;

    @sda,b,8,0

    @sda1,b,8,1

    Hopefully I got this correct?

    So, now when I mount the USB partition I get 

    mount -n -t vfat /dev/sda1 /mnt/usb
FAT: codepage cp437 not found
mount: wrong fs type, bad option, bad superblock on /dev/sda1,
       or too many mounted file systems#

    What could cause "FAT: codepage cp437 not found" ?

    I believe that the formatting is correct; 

    Disk /dev/sda: 65 MB, 65011712 bytes
2 heads, 62 sectors/track, 1024 cylinders
Units = cylinders of 124 * 512 = 63488 bytes
   Device Boot    Start       End    Blocks   Id  System
/dev/sda1               1        1024       63457    b  Win95 FAT32
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    --- Quote Start ---

    originally posted by sfielding+jun 23 2005, 05:49 am--><div class='quotetop'>quote (sfielding @ jun 23 2005, 05:49 am)</div>

    --- quote start ---

    thanks marc, that helped.

    it turned out that i also needed to add some nodes to the filesystem;

    @sda,b,8,0

    @sda1,b,8,1

    hopefully i got this correct?[/b]

    --- quote end ---

    looks right. 

    $ ls -al /dev/sda*
brw-rw----  1 root disk 8,  0 2002-03-14 22:51 /dev/sda
brw-rw----  1 root disk 8,  1 2002-03-14 22:51 /dev/sda1

    <!--quotebegin-sfielding@Jun 23 2005, 05:49 AM

    so, now when i mount the usb partition i get 

    mount -n -t vfat /dev/sda1 /mnt/usb
fat: codepage cp437 not found
mount: wrong fs type, bad option, bad superblock on /dev/sda1,
       or too many mounted file systems#

    what could cause "fat: codepage cp437 not found" ?

    --- Quote End ---

    This looks to my like you either did not compile vfat support in your kernel 

    $ cat /usr/src/linux-2.6.12/.config |grep VFAT
CONFIG_VFAT_FS=m

    (or =y in case you want it compiled in instead of a module), or some NLS settings: 

    $ cat /usr/src/linux-2.6.12/.config |grep 437
CONFIG_FAT_DEFAULT_CODEPAGE=437
CONFIG_NLS_DEFAULT="cp437"
CONFIG_NLS_CODEPAGE_437=y

    but since I never actively remember setting them myself, I would assume they are set by selecting the VFAT configuration.

    --- Quote Start ---

    originally posted by sfielding@Jun 23 2005, 05:49 AM

    i believe that the formatting is correct; 

    disk /dev/sda: 65 mb, 65011712 bytes
2 heads, 62 sectors/track, 1024 cylinders
units = cylinders of 124 * 512 = 63488 bytes
   device boot    start       end    blocks   id  system
/dev/sda1               1        1024       63457    b  win95 fat32

    --- Quote End ---

    looks right, at least the default crappy formatting of USB sticks seems already cleared http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/laugh.gif
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    You can find the codepage stuff in the kernel configuration under

    File systems --->

    Native Language Support --->

    Dennis Scott

    Microtronix Datacom
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    It works now!

    I added the approprite character set support to the kernel, and all is well.

    Thanks for your help marc and dennis. It is much appreciated.
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    Hello sfielding,

    did you make an SOPC Builder USB component ? Is this for commercial use and/or in any kind of open source licensing ?

    We are looking a USB core for Nios2, and if there is a free (or cheap) way to do it, I would be glad to know :-).

    Could you give me more info (is this a full USB core, or an IP to connect to an USB chipet, or else ) ?

    Best regards,

    pod
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    Hello cetic,

    I will be updating the Opencores project this week of June 27th. In case you are interested, I will be making the uClinux driver available in the downloads section, of the Opencores project.

    I may build the SOPC Builder component too, it depends how much time I have. If I don&#39;t, the core comes with a top level wrapper, that adapts the Opencores Wishbone bus to the Altera Avalon bus, using the Avalon naming convention, so it is easier to import.
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    One more question, sfielding :

    you say in the opencores project that the 50MHz oscillator on the Altera Nios evalboard must be changed by a 48MHz oscillator. I suppose this is because the USB ip in the FPGA must run at a specific frequency that cannot be generated by a PLL from the original 50MHz. Is this true ? If yes, what is that frequency ?

    Thanks again,

    Best regards

    Pod