Exposing CV SOCkit dev as usb mass storage gadget, accessible from windows 7 machine

According to this page ...

http://www.linux-usb.org/gadget/file_storage.html

You need to partition the backing store before passing it off to the USB gadget driver.

Cheers,

Dave

Dave,

Thanks so much for your quick response.

I had run through the partitioning earlier today with no luck. I did it again and got the same results.

The fdisk parameters for the partition creation (n command if fdisk) are sector start/stop instead of cyclinder (which I see in the example). I will continue to cast about for a resolution to this. . .

here is my terminal dump with the commands that i ran:

root@arrow_sockit:~# dd bs=1M count=64 if=/dev/zero of=./backing_file

64+0 records in

64+0 records out

root@arrow_sockit:~# fdisk backing_file

Welcome to fdisk (util-linux 2.21.2).

Changes will remain in memory only, until you decide to write them.

Be careful before using the write command.

Device does not contain a recognized partition table

Building a new DOS disklabel with disk identifier 0xe3700929.

Command (m for help): x

Expert command (m for help): s

Number of sectors (1-63, default 63): 8

Expert command (m for help): h

Number of heads (1-256, default 255): 16

Expert command (m for help): c

Number of cylinders (1-1048576, default 8): 1024

Expert command (m for help): r

Command (m for help): m

Command action

a toggle a bootable flag

b edit bsd disklabel

c toggle the dos compatibility flag

d delete a partition

l list known partition types

m print this menu

n add a new partition

o create a new empty DOS partition table

p print the partition table

q quit without saving changes

s create a new empty Sun disklabel

t change a partition's system id

u change display/entry units

v verify the partition table

w write table to disk and exit

x extra functionality (experts only)

Command (m for help): n

Partition type:

p primary (0 primary, 0 extended, 4 free)

e extended

Select (default p): p

Partition number (1-4, default 1): 1

First sector (2048-131071, default 2048): 1

Value out of range.

First sector (2048-131071, default 2048):

Using default value 2048

Last sector, +sectors or +size{K,M,G} (2048-131071, default 131071):

Using default value 131071

Partition 1 of type Linux and of size 63 MiB is set

Command (m for help): t

Selected partition 1

Hex code (type L to list codes): b

Changed system type of partition 1 to b (W95 FAT32)

Command (m for help): p

Disk backing_file: 67 MB, 67108864 bytes

16 heads, 8 sectors/track, 1024 cylinders, total 131072 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0xe3700929

Device Boot Start End Blocks Id System

backing_file1 2048 131071 64512 b W95 FAT32

Command (m for help): w

The partition table has been altered!

WARNING: If you have created or modified any DOS 6.x

partitions, please see the fdisk manual page for additional

information.

Syncing disks.

root@arrow_sockit:~# modprobe g_mass_storage file=./backing_file

ERROR: could not insert 'g_mass_storage': No such device

root@arrow_sockit:~#

Thanks for the quick response, Dave.

I had tried the partitioning earlier and had no luck. The parmeters that fdisk asks for are not quite the same as the ones in the example, this bugs me. When I am partitioning it asks me for sector start/stop rather than cylinder.

I get the same error with modprobe.

Here is the full terminal dump:

Sending discover...

Sending discover...

No lease, failing

Starting portmap daemon...

Sun Sep 29 01:40:00 UTC 2013

INIT: Entering runlevel: 5

Starting OpenBSD Secure Shell server: sshd

NET: Registered protocol family 10

IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready

done.

Starting syslogd/klogd: done

Starting Lighttpd Web Server: lighttpd.

Starting blinking LED server

Stopping Bootlog daemon: bootlogd.

_ ____ ____ _ ___ _ _ _____ _

/ \ _ __ _ __ _____ __ / ___| ___ / ___| |/ (_) |_ / |___ / / |

/ _ \ | '__| '__/ _ \ \ /\ / / \___ \ / _ \| | | ' /| | __| | | |_ \ | |

/ ___ \| | | | | (_) \ V V / ___) | (_) | |___| . \| | |_ | |___) || |

/_/ \_\_| |_| \___/ \_/\_/ |____/ \___/ \____|_|\_\_|\__| |_|____(_)_|

arrow_sockit login: root

root@arrow_sockit:~# modprobe g_mass_storage

ERROR: could not insert 'g_mass_storage': No such device

root@arrow_sockit:~# modprobe g_mass_storage file=./backing_fi

ERROR: could not insert 'g_mass_storage': No such device

root@arrow_sockit:~# ls

README disk-file.img readme

adam_cool_beans disk_img.img soc_system.rbf

altera hello sockit_golden_top.rbf

backing_file hps_gpio test.txt

bridgeoff.sh led_blink yipee_led

bridgeon.sh led_blink_devices.sh

clear_leds.sh my_first_hps

root@arrow_sockit:~# modprobe g_mass_storage file=./backing_file

ERROR: could not insert 'g_mass_storage': No such device

root@arrow_sockit:~# modprobe g_mass_storag file=./backing_file

FATAL: Module g_mass_storag not found.

root@arrow_sockit:~# modprobe g_mass_storage file=./backing_file

ERROR: could not insert 'g_mass_storage': No such device

root@arrow_sockit:~# dd bs=1M count=64 if=/dev/zero of=./backing_file

64+0 records in

64+0 records out

root@arrow_sockit:~# fdisk backing_file

Welcome to fdisk (util-linux 2.21.2).

Changes will remain in memory only, until you decide to write them.

Be careful before using the write command.

Device does not contain a recognized partition table

Building a new DOS disklabel with disk identifier 0x5b98fcf9.

Command (m for help): x

Expert command (m for help): s

Number of sectors (1-63, default 63): 8

Expert command (m for help): h

Number of heads (1-256, default 255): 16

Expert command (m for help): c

Number of cylinders (1-1048576, default 8): 1024

Expert command (m for help): r

Command (m for help): n

Partition type:

p primary (0 primary, 0 extended, 4 free)

e extended

Select (default p): p

Partition number (1-4, default 1): 1

First sector (2048-131071, default 2048):

Using default value 2048

Last sector, +sectors or +size{K,M,G} (2048-131071, default 131071):

Using default value 131071

Partition 1 of type Linux and of size 63 MiB is set

Command (m for help): n

Partition type:

p primary (1 primary, 0 extended, 3 free)

e extended

Select (default p): p

artition number (1-4, default 2):

Using default value 2

No free sectors available

Command (m for help): exit

e: unknown command

Command action

a toggle a bootable flag

b edit bsd disklabel

c toggle the dos compatibility flag

d delete a partition

l list known partition types

m print this menu

n add a new partition

o create a new empty DOS partition table

p print the partition table

q quit without saving changes

s create a new empty Sun disklabel

t change a partition's system id

u change display/entry units

v verify the partition table

w write table to disk and exit

x extra functionality (experts only)

Command (m for help): q

root@arrow_sockit:~# dd bs=1M count=64 if=/dev/zero of=./backing_file

64+0 records in

64+0 records out

root@arrow_sockit:~# fdisk backing_file

Welcome to fdisk (util-linux 2.21.2).

Changes will remain in memory only, until you decide to write them.

Be careful before using the write command.

Device does not contain a recognized partition table

Building a new DOS disklabel with disk identifier 0xe3700929.

Command (m for help): x

Expert command (m for help): s

Number of sectors (1-63, default 63): 8

Expert command (m for help): h

Number of heads (1-256, default 255): 16

Expert command (m for help): c

Number of cylinders (1-1048576, default 8): 1024

Expert command (m for help): r

Command (m for help): m

Command action

a toggle a bootable flag

b edit bsd disklabel

c toggle the dos compatibility flag

d delete a partition

l list known partition types

m print this menu

n add a new partition

o create a new empty DOS partition table

p print the partition table

q quit without saving changes

s create a new empty Sun disklabel

t change a partition's system id

u change display/entry units

v verify the partition table

w write table to disk and exit

x extra functionality (experts only)

Command (m for help): n

Partition type:

p primary (0 primary, 0 extended, 4 free)

e extended

Select (default p): p

Partition number (1-4, default 1): 1

First sector (2048-131071, default 2048): 1

Value out of range.

First sector (2048-131071, default 2048):

Using default value 2048

Last sector, +sectors or +size{K,M,G} (2048-131071, default 131071):

Using default value 131071

Partition 1 of type Linux and of size 63 MiB is set

Command (m for help): t

Selected partition 1

Hex code (type L to list codes): b

Changed system type of partition 1 to b (W95 FAT32)

Command (m for help): p

Disk backing_file: 67 MB, 67108864 bytes

16 heads, 8 sectors/track, 1024 cylinders, total 131072 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0xe3700929

Device Boot Start End Blocks Id System

backing_file1 2048 131071 64512 b W95 FAT32

Command (m for help): w

The partition table has been altered!

WARNING: If you have created or modified any DOS 6.x

partitions, please see the fdisk manual page for additional

information.

Syncing disks.

root@arrow_sockit:~# modprobe g_mass_storage file=./backing_file

ERROR: could not insert 'g_mass_storage': No such device

root@arrow_sockit:~# root@arrow_sockit:~# modprobe g_mass_storage file=./backing_file

-sh: root@arrow_sockit:~#: command not found

root@arrow_sockit:~# ERROR: could not insert 'g_mass_storage': No such device

-sh: ERROR:: command not found

root@arrow_sockit:~# root@arrow_sockit:~#

-sh: root@arrow_sockit:~#: command not found

root@arrow_sockit:~#

Hey Dave,

Thanks for the quick response. I had tried to partition earlier with no luck. I tried again, with no luck.

One insoncistency that I saw was that the when I use the "n" option in fdisk that it asks me for start/end sectors instead of cylinders that I see in the example.

Thanks,

Adam

Here is the terminal dump for the commands that I used:

root@arrow_sockit:~# dd bs=1M count=64 if=/dev/zero of=./backing_file

64+0 records in

64+0 records out

root@arrow_sockit:~# fdisk -c=dos

Usage:

fdisk [options] <disk> change partition table

fdisk [options] -l <disk> list partition table(s)

fdisk -s <partition> give partition size(s) in blocks

Options:

-b <size> sector size (512, 1024, 2048 or 4096)

-c[=<mode>] compatible mode: 'dos' or 'nondos' (default)

-h print this help text

-u[=<unit>] display units: 'cylinders' or 'sectors' (default)

-v print program version

-C <number> specify the number of cylinders

-H <number> specify the number of heads

-S <number> specify the number of sectors per track

root@arrow_sockit:~# fdisk -c='dos'

Usage:

fdisk [options] <disk> change partition table

fdisk [options] -l <disk> list partition table(s)

fdisk -s <partition> give partition size(s) in blocks

Options:

-b <size> sector size (512, 1024, 2048 or 4096)

-c[=<mode>] compatible mode: 'dos' or 'nondos' (default)

-h print this help text

-u[=<unit>] display units: 'cylinders' or 'sectors' (default)

-v print program version

-C <number> specify the number of cylinders

-H <number> specify the number of heads

-S <number> specify the number of sectors per track

root@arrow_sockit:~# fdisk c=dos

Welcome to fdisk (util-linux 2.21.2).

Changes will remain in memory only, until you decide to write them.

Be careful before using the write command.

fdisk: unable to open c=dos: No such file or directory

root@arrow_sockit:~# fdisk -c=dos ./backing_file

Welcome to fdisk (util-linux 2.21.2).

Changes will remain in memory only, until you decide to write them.

Be careful before using the write command.

Device does not contain a recognized partition table

Building a new DOS disklabel with disk identifier 0xb4aa408e.

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

switch off the mode (with command 'c').

Command (m for help): e

e: unknown command

Command action

a toggle a bootable flag

b edit bsd disklabel

c toggle the dos compatibility flag

d delete a partition

l list known partition types

m print this menu

n add a new partition

o create a new empty DOS partition table

p print the partition table

q quit without saving changes

s create a new empty Sun disklabel

t change a partition's system id

u change display/entry units

v verify the partition table

w write table to disk and exit

x extra functionality (experts only)

Command (m for help): x

Expert command (m for help): s

Number of sectors (1-63, default 63): 8

Warning: setting sector offset for DOS compatiblity

Expert command (m for help): h

Number of heads (1-256, default 255): 16

Expert command (m for help): c

Number of cylinders (1-1048576, default 8): 1024

Expert command (m for help): r

Command (m for help): n

Partition type:

p primary (0 primary, 0 extended, 4 free)

e extended

Select (default p): p

Partition number (1-4, default 1): 1

First sector (8-131071, default 8):

Using default value 8

Last sector, +sectors or +size{K,M,G} (8-131071, default 131071):

Using default value 131071

Partition 1 of type Linux and of size 64 MiB is set

Command (m for help): t

Selected partition 1

Hex code (type L to list codes): b

Changed system type of partition 1 to b (W95 FAT32)

Command (m for help): o

Building a new DOS disklabel with disk identifier 0xee0c56f2.

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

switch off the mode (with command 'c').

Command (m for help): p

Disk ./backing_file: 67 MB, 67108864 bytes

16 heads, 8 sectors/track, 1024 cylinders, total 131072 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0xee0c56f2

Device Boot Start End Blocks Id System

Command (m for help): w

The partition table has been altered!

WARNING: If you have created or modified any DOS 6.x

partitions, please see the fdisk manual page for additional

information.

Syncing disks.

root@arrow_sockit:~# modprobe g_mass_storage file=./backing_file

Hi Adam,

--- Quote Start ---

I had tried to partition earlier with no luck. I tried again, with no luck.

--- Quote End ---

Sorry, your response is not clear; you had no luck partitioning the backing store, or you did partition it ok and had no luck with the USB gadget interface using it?

I have an SoCKit ordered, but have not received it yet, so cannot try this yet.

Cheers,

Dave