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1  Hardware and U-Boot firmware / Hardware / Re: Flash Corruption- USB controller broken?? on: September 17, 2013, 12:12:19 PM
IT WAS THE PSU!!!

It has taken me this long to connect a regulated bench PSU. INSANE. My old PSU was a cheap  220V in 5v 2a out dc, so at UK 240v it gradually must have failed over about 2 years. 

Have replaced and hopefully trouble free from now.
2  Hardware and U-Boot firmware / Hardware / Re: Is my sheevaplug dead ??? on: September 17, 2013, 12:05:15 PM
You just have to wait 9 hrs unplugged if your scared the cap will discharge through you when you open the aluminum case to get at the psu.
The whole plug design is crazy as the aluminum is only there to screen the tiny electronics from the psu as its so close together.
I have went through trying to repair the capacitor in the orginal PSU, which worked for 6 months or so, and then taking out the entire module and directly wiring a 5v 2A psu (which was not great quality and lasted only 2 years more as it was not UK 240v in but 220v in) and now I got a proper bench psu thinking there were faults in the unit - only to find it worked perfectly when it had 5v regulated connected.
I hav finally dug out a LINKSYS ATA 5V 2A psu, and wired that in today. It looks higher quality I hope it lasts.
Basically 99% of all sheeva plug problems - erratic behavour, network going down etc.. are going to be down to a failing PSU.
 
3  Hardware and U-Boot firmware / Hardware / Re: Is my sheevaplug dead ??? on: September 10, 2013, 01:49:40 PM
Its 99% that its due to the Power supply unit.
Simply buy a regulated PSU from ebay for a few quid (5v and 2amps) and, with a multimeter and some soldering, you will be able to fix it easily. You can simply take out the old psu and wire up the new. Newit also sell a sheeva PSU module but you have to ask -  will it fail again?
checkout my name and posts on newit's forum and you will get pics of how to do it.
4  Hardware and U-Boot firmware / Hardware / Re: Flash Corruption- USB controller broken?? on: April 01, 2013, 04:22:11 AM
I have the near exact same symptioms.
I found the network the plug runs, and has run for 3 years, started to become erratic, going down and I had to reboot to get it going again. This persisted for a couple of days, and I thought it was the SD card - but that checked out fine. Then I thought it was the USB Hub or USB HDD - but they were fine. Eventually after its umpteeth reboot, the  ip address for the plug became erractic and then died. I couldn't believe it. The plug would'nt then boot and access was only via the miniUSB port.

I have had to create  a unbuntu partition on my windows 7 computer, and get familiar with the openocd and ESIA software (which doesn't work without fiddling of course!) and been falshing U-Boot to it via the mini usb, but still cannot get it to boot and image. It seems to be fine for the first 20 mins, but after that becomes erratic and refuses to load images from my tftp server.

 I cannot get its ip address on the network, but tftp still seems to work fine, as long as the plug's serverip env var is set to the tftp server and gatewayip is set.
ipaddr can be anything and it still loads from the tftp server - just as well as it doesn't seem to use IP but UDP.

Anyway, I am hopeful it may be the PSU - I binned the original PSU years ago and stuck in a 2A5V switched mode PSU. Or - the nand may be knackered, or component failure as it get hot - (capacitors) may be the problem. Its a damm shame but after spending a week on this I will have to give it up and look for another reliable linux low powered server.
5  Hardware and U-Boot firmware / U-Boot stuff / Re: Latest Uboot? on: March 28, 2013, 02:27:39 PM
OH - thanks a whole LOT for that - been having some real problems with my sheevaplug and u-BOOT
6  Hardware and U-Boot firmware / U-Boot stuff / Re: Latest Uboot? on: March 23, 2013, 01:33:57 PM
FYI: I just tried to install this following Martins advice and have now bricked my Sheevaplug.
7  Hardware and U-Boot firmware / Hardware / Re: Is my sheevaplug dead ??? on: March 23, 2013, 01:29:21 PM
Yeah - it works - but it failed again soon after with component failure. I couldn't believe it. (the charge/discharge cycle of the 16V cap might have caused this)

What I did was order a SWITCHED MODE power supply 5V@2Amps and wired that in, removing the Sheevaplug PSU module. I think it cost about 5-6. Switched mode power supplies have smaller transformer, capacitor's etc... and are hopefully engineered better than the Sheevaplug PSU.

It worked again fine after that. It has just gone down in the past week - but nothing to do with the PSU.
 
8  Hardware and U-Boot firmware / Hardware / Re: Is my sheevaplug dead ??? on: June 20, 2011, 09:56:01 AM
My Sheevaplug gave up the ghost 17/06/2011. At first the green lights came on didn't flicker and stayed on. The ethernet port also stayed green. I unplugged it and it was dead next time I plugged it in. I needed it up and running, so opened it up and the output stage cap 1000uF 6.3V 105C was bulging.
I when down to Maplin (UK electronics store) and ordered a replacement High Temp Electrolytic 1000uF cap for 44p - could only get 16V but still fitted in the PSU case ok even though it was a little bigger.
Literally got it back up and running 10 mins ago.
It seems to blink green a few times when first turned on, maybe thats because of the larger cap having a longer charging time.

Anyway, Fingers crossed I hope it lasts!
9  Linux Stuff / General Linux questions / Re: Guruplug does not recognize USB devices on: August 31, 2010, 12:39:06 AM
Well well well - the brand new Belkin hub bought from Tesco is the culprit. Lasted all of 1 day working. Tested it on my other computer and still nothing.
Luckly, the sheevaplug is fine.
10  Linux Stuff / General Linux questions / Re: Guruplug does not recognize USB devices on: August 31, 2010, 12:15:31 AM
My Usb hub - belkin F5U404 (powered).
This hub, which was working - been right through UBOOT enviromental settings, setting them back to what they should be.

But still no luck in enumerating devices on the usb via

Marvell >> usb start, usb reset, usb tree no matter how many times i do it.

If I plug in my WD MyBook HDD and remove the hub, its detected.

Obviously there is no operating system at this level which removes any possibility of aptitude conflicts etc...

Its either the hubs faulty or the sheevaplug is.



11  Linux Stuff / General Linux questions / Re: Guruplug does not recognize USB devices on: August 30, 2010, 02:47:29 PM
Exactly same problem but i have a sheevaplug.
I had everything working fine - many devices detected on my belkin usb hub no problem, yet while messing around with setenv in UBOOT I did a resetenv by accident and lost all my UBOOT settings. I reconstructed enough to make the plug boot OK from the guide on this site, but now I get the same error message as you.
I also installed a few massive packages on the plug with aptitude.
I have only rebooted 3 times to try to correct this so it may be that the usb start etc.. in UBOOT is the issue here in that its notoroius for not detecting USB devices, or it may be missing a UBOOT enviromental setting

12  Hardware and U-Boot firmware / U-Boot stuff / Re: Problem with Booting the kenel from a spinning USB disk on: January 21, 2010, 10:04:05 AM
Anyone ever get a workaround for this? appending reset doesnt work for me because it bombs out...
13  Hardware and U-Boot firmware / U-Boot stuff / Re: U-Boot can't read USB HDD partition table on: January 21, 2010, 09:50:46 AM
Same problem

1. Have upgraded to U-Boot xxx.27
2. On shutdown/soft reset

USB:   scanning bus for devices... 2 USB Device(s) found
Waiting for storage device(s) to settle before scanning...
T 1 Storage Device(s) found
** Bad partition 1 **
** Bad partition 1 **
## Booting image at 0040000 ...
Bad Magic Number

I never get to the reset (and retry) part because it drops into U-BOOT and bombs out after the usb start..!

On a power off and on cycle it boots.

14  General Category / General Discussion / Re: Sheevaplug installer - version 1.0 on: January 21, 2010, 05:03:18 AM
I must say I have had real problems in getting this to work on windows XP. Its fully working on my other ubuntu partition.

I know what my problem is because I cannot even connect to the sheevabox with the console. Its the  FTDI 2232 drivers. I cannot get them to install. The ones mentioned in the plugcomputer.org serial connection guide are gone from the marvel site, and I have no cd. I went direct to the FTDI site, and downloaded CDM 2.06.00 WHQL Certified drivers. But I just cannot get them recognised in XP.

Device Manager just shows two SheevaPlug "JTAGKey FD 2232D B"'s as uninstalled.
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