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PostPosted: Mon Aug 15, 2011 5:01 pm 
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Joined: Sun Jun 21, 2009 11:39 am
Posts: 14
Hi,

Has anyone managed to add a serial port to a Kirkwood-based Linkstation Mini ?

Instead of the 4-pin serial port header of the LS-WSGL, there is now a 3-pin header labelled SW4. Center is GND, one pin is pulled to 3.3 V, the third pin seems to be high-Z. I could not see any serial signal during boot. Needless to say, the traces are hard to follow.

Board pictures:
http://buffalo.nas-central.org/w/images ... _front.jpg
http://buffalo.nas-central.org/w/images ... B_back.jpg


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PostPosted: Sat Aug 20, 2011 3:36 pm 
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Joined: Sun Jun 21, 2009 11:39 am
Posts: 14
Some progress: I believe one of the SW4 pins goes to pin R18 under the CPU. According to the Marvell datasheet, R18 cannot be configured as a UART signal. So it looks like SW4 actually is a switch.

My next candidate for a serial port is CN6, which is behind a SATA connector, very much like the jtag+serial header of the LS-XHL. Pinout is:
GND
+5V (power jack)
unidentified
unidentified

Both unidentified signals are routed through internal layers of the PCB and resurface at vias underneath IC7 (a 8-pin serial eeprom). I could not trace them anywhere else.

On other Linkstation PCBs, Buffalo usually interrupt their serial port signals underneath large capacitors. Does anyone think they could have done it underneath an IC this time ? Has anyone desoldered IC7 on a LS-WSXL ?


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PostPosted: Sat Jun 30, 2012 4:36 pm 
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Joined: Sat Jun 30, 2012 4:18 pm
Posts: 3
pabr wrote:
On other Linkstation PCBs, Buffalo usually interrupt their serial port signals underneath large capacitors. Does anyone think they could have done it underneath an IC this time ? Has anyone desoldered IC7 on a LS-WSXL ?


My WSXL broke. Not booting any more.

So I took the serial flash away and there seems to be 3 pairs of connectors underneath it. 2 of those connectors are connected to CN6.

I suppose CN6 will be serial interface if the connections are made right.

I can not post any pictures here to the forum. So I put one here:

http://tilator.wippiespace.com/Iomega/IMG_0004.JPG

I scratched green paint of from 4 pads, but 2 of them can be seen still green.


Last edited by tilator on Sun Jul 08, 2012 1:23 pm, edited 1 time in total.

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PostPosted: Sat Jul 07, 2012 5:23 am 
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Joined: Mon Oct 08, 2007 6:34 am
Posts: 334
Good work!

_________________
KuroHG - UBoot 1.2, foonas-em & Debian Wheezy - 3.4 Kernel
Kurobox Pro - Dave's Lenny-armel
LS-WVL - opened
LS-XHL - Squeeze Bootstrap
LS-VL - Squeeze Bootstrap


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PostPosted: Sun Jul 26, 2015 12:41 pm 
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Total Newbie

Joined: Sun Jul 26, 2015 12:03 pm
Posts: 1
tilator wrote:
pabr wrote:
On other Linkstation PCBs, Buffalo usually interrupt their serial port signals underneath large capacitors. Does anyone think they could have done it underneath an IC this time ? Has anyone desoldered IC7 on a LS-WSXL ?


My WSXL broke. Not booting any more.

So I took the serial flash away and there seems to be 3 pairs of connectors underneath it. 2 of those connectors are connected to CN6.

I suppose CN6 will be serial interface if the connections are made right.

I can not post any pictures here to the forum. So I put one here:

http://tilator.wippiespace.com/Iomega/IMG_0004.JPG

I scratched green paint of from 4 pads, but 2 of them can be seen still green.


I am interested very in your photo.

But I can not see your photo. Re-upload, please.


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PostPosted: Sun Jan 03, 2016 1:49 pm 
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Total Newbie

Joined: Tue Mar 05, 2013 6:42 pm
Posts: 2
I would also like to enable the UART and JTAG ports.

Here is the view of IC7 removed. I am not sure what needs to be bridged, and if someone can could tell me how to enable CN2 and CN4 (CN2==JTAG?).
I'm also curious as to what CN4 and SW2 are for and how to enable them too.

Image

Image

Yes, I know i'm replying to a 5 year old thread, last posted to half a year ago. xD

Image

_________________
-=:MaDc0w:=-

https://github.com/MaDc0wUSP


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PostPosted: Wed Jan 04, 2017 5:44 pm 
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Newbie

Joined: Sun Jun 21, 2009 11:39 am
Posts: 14
Some progress:
http://buffalo.nas-central.org/wiki/Add ... Mini_v2%29

No serial output from u-boot nor from the kernel (with a fairly old firmware version), but I was able to enter the Kirkwood bootstrap ROM.


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