Unsolved
1 Rookie
•
20 Posts
0
47
September 1st, 2025 18:22
Dell PowerSwitch S6010-ON with potential AVR54 / LPC bug of Atom C2000 C2538 Stepping B0, Where is the LPC_CLKOUT0 pin ?
Hi,
I have a Dell PowerSwitch S6010-ON switch
Which is exhibiting issues with the ethernet management port very likely to be caused with the AVR54 CPU bug related to the LPC clock signal.
This issue is commonly resolved with the addition of a single resistor of a value between 130 and 2000 OHM between 3.3 volt and the LPC_CLKOUT0 and/or LPC_CLKOUT1 pins.
However, since the S6010-ON is a rather rare and obscure switch, I have not found anywhere someone that has performed this fix on this switch model.
I need to know, where are are the LPC_CLKOUT0 and/or LPC_CLKOUT1 pins !
Here is a picture of my switch SBC board where the pin should be.
Can anyone point out where it should be ?
Even just a general area, I can find the exact pin by looking at the signal with an oscilloscope as the signal scope trace has been documented
dell.ps-on.user
1 Rookie
•
20 Posts
0
September 1st, 2025 18:24
Here is the actual picture of my SBC board
dell.ps-on.user
1 Rookie
•
20 Posts
0
September 1st, 2025 18:26
In my previous post, the picture I posted did not appear
Here is an imgur link of it
DELL-Rey G
3 Apprentice
•
1K Posts
0
September 2nd, 2025 22:13
From reading various articles, it seems that the pins its referring to (LPC_CLKOUT0 and LPC_CLKOUT1) are on the atom chip itself, so you would need to find the pinout for the chip and its location on the board (but I bet its under the heatsink), and then solder the resistor in the proper location.
Rey
#Iwork4Dell
dell.ps-on.user
1 Rookie
•
20 Posts
0
September 4th, 2025 02:08
Hi,
Yes, I think also you are correct, I also have a celestica d4040 switch and the pin of LPC_CLKOUT is right on the edge under the heatsink
Here is the location as per forum post on serverthehome
https://forums.servethehome.com/index.php?threads/rework-for-celestica-avr54-bug.40661/
I have removed the heatsink on my switch and I hope to find the signal via probing with the oscilloscope
My next message will contain pictures of the CPU area on my board.
(edited)
dell.ps-on.user
1 Rookie
•
20 Posts
0
September 4th, 2025 02:28
Based on the location on the d4040 board of the LPC_CLKOUT(0|1?) pad and the CPU orientation.
I suspect that on the S6010-ON the pad is somewhere in this vicinity
dell.ps-on.user
1 Rookie
•
20 Posts
0
September 4th, 2025 02:49
The TI TPS54426 chip in the upper left quadrant is from input 4.5v-18v to output 0-5V step down dc-to-dc converter
The PCA9548A chip is a 8-Channel I2C Multiplexer, so closely related to the LPC functionality, I think there's a high probability to find the LPC_CLKOUT signal somewhere in there.
Here is a closeup of the relevant region
dell.ps-on.user
1 Rookie
•
20 Posts
0
September 4th, 2025 02:52
Here is the board section to the "right" (rearward)
(edited)
dell.ps-on.user
1 Rookie
•
20 Posts
0
September 4th, 2025 03:16
Here are some good threads on this issue
EEVblog : Topic: Intel Atom C2000 bug - help locate
https://www.eevblog.com/forum/repair/intel-atom-c2000-bug-help-locate-lpc_clkout0-on-pcb/
Bug in Intel Atom C2000 series processors?
https://forums.servethehome.com/index.php?threads/bug-in-intel-atom-c2000-series-processors.13173
On page 6 this diagram shows the clock signal waveform, for a working and a non-working signal, it is a 3.3v signal however I don't have the timebase.
Here is the AVR54 bug errata relevant information
https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/atom-c2000-family-spec-update.pdf
(edited)
YashSmith
1 Rookie
•
19 Posts
0
September 10th, 2025 09:13
The LPC_CLKOUT0 pin on the Dell PowerSwitch S6010-ON with Atom C2000 C2538 B0 stepping is not publicly documented. Its location may be identified using an oscilloscope to detect the signal on the SBC board, or by consulting Dell Technical Support for guidance.
dell.ps-on.user
1 Rookie
•
20 Posts
0
September 10th, 2025 19:01
Thanks, I have been searching and couldn't find.
I hope someone from Dell could point me in the right direction.
Even if they don't know, which devices are connected to the cl
I have started probing all these points that are under the heatsink, it is taking a lot of time !