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Posts: 330 | Thanked: 556 times | Joined on Oct 2012
#1
I would like to run fsck.ext3 on the /home/user partition, and since you can't unmount this on a running N900 without potential issues, I thought about:

1. Start N900 A with BackupMenu, and enable Mass Storage Mode (read/write).

2. Connect N900 A to N900 B via USB OTG Host cable. N900 B should be running h-e-n.

Does this sound alright?

I'm trying to run fsck.ext3 from a N900, not from another machine like a Linux box, due to some hypothetical issues.

Last edited by malfunctioning; 2014-10-23 at 22:36.
 
Posts: 915 | Thanked: 3,209 times | Joined on Jan 2011 @ Germany
#2
I just connected my testing N900 to my main N900 (running h-e-n).

When I select low speed mode and enable vbus boost the testing device brings up the menu to select between mass storage and pc suite mode and even says it's being charged.

The h-e-n device seems to detect the other N900 but says it didn't detect a file system and I can't see any additional storage devices in /dev.

excerpt from dmesg:
Code:
[16652.021392] Forced hostmode error: a full/high-speed device attached but low-speed mode selected
[16652.021484] usb usb1: usb resume
[16652.044189] hub 1-0:1.0: hub_resume
[16652.044219] hub 1-0:1.0: port 1: status 0301 change 0001
[16652.153564] hub 1-0:1.0: state 7 ports 1 chg 0002 evt 0000
[16652.153625] hub 1-0:1.0: port 1, status 0301, change 0000, 1.5 Mb/s
[16652.278442] usb 1-1: new low speed USB device using musb_hdrc and address 46
[16657.278625] usb 1-1: khubd timed out on ep0in len=0/64
[16662.278594] usb 1-1: khubd timed out on ep0in len=0/64
[16667.278472] usb 1-1: khubd timed out on ep0in len=0/64
[16667.403472] usb 1-1: device descriptor read/64, error -110
 

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Posts: 330 | Thanked: 556 times | Joined on Oct 2012
#3
Thank you sulu.

I'm wondering if this could be accomplished by connecting N900 B to a powered USB Hub and disabling vbus boost in h-e-n. That setting is in order to provide power to the USB guest, correct?

Last edited by malfunctioning; 2014-10-23 at 23:41.
 
Community Council | Posts: 677 | Thanked: 1,227 times | Joined on Sep 2010 @ Mbabane
#4
It should even work without USB hub actually. The requirement for external power applies for devices which don't have a power source themselves.
MohammadAG has even flashed an N900 from another.

sulu: have you ever tried high-speed? as the N900 is actually a high speed USB device..
 
Posts: 915 | Thanked: 3,209 times | Joined on Jan 2011 @ Germany
#5
Originally Posted by sicelo View Post
sulu: have you ever tried high-speed? as the N900 is actually a high speed USB device..
Yes, I tried that first but since the dialogue on the testing device didn't come up I thought it wouldn't work.
 
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Posts: 6,445 | Thanked: 20,981 times | Joined on Sep 2012 @ UK
#6
Possibly a silly question but... might it help to fully charge the slave device first?

It's to do with the charging current. I once attached an N900 to a PC through one of these contraptions and watched the charging current gradually decreasing from about 480mA (too much for the master N900) to about 20mA as the battery charged.
 
Posts: 1,417 | Thanked: 2,619 times | Joined on Jan 2011 @ Touring
#7
I have used this to do big file transfers between two N900s several times, works great using the USB mode applet.
I have also used this (without mass storage) to boost my wife's phone when she forgets to charge it overnight though now that I have a battery pod I prefer to use that rather than waste my phone's charge.
just connect the phones turn on host mode on one and choose mass storage on the other, I think you need to act fast with choosing mass storage or USB mode will time out.
 

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