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September 1st, 2025 18:20
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
Here are some further resources
Atom C2000 datasheet
AVR54 Bug errata
Discussion thread on EEVBLOG about AVR54 bug in similar hardware
https://www.eevblog.com/forum/microcontrollers/intel-atom-c2000-failures/
Demon
dell.ps-on.user
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September 1st, 2025 20:29
oops this is a double post, see the other one which includes the picture of the board
https://www.dell.com/community/en/conversations/networking-general/dell-powerswitch-s6010-on-with-potential-avr54-lpc-bug-of-atom-c2000-c2538-stepping-b0-where-is-the-lpcclkout0-pin/68b5e466c5deda10ccd73035
YashSmith
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September 4th, 2025 09:07
Can you please explain in detail?
bencutting51
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September 15th, 2025 12:45
That’s a tricky one the C2000 AVR54 workaround is well documented, but finding the exact LPC clock pins on a Dell S6010-ON board isn’t easy since Dell doesn’t publish detailed schematics. On most Atom C2538 boards I’ve seen, LPC_CLKOUT0/1 are near the southbridge / debug header area, so scoping that region might help. If you’ve got the datasheet, I’d start tracing from the CPU package pins and look for any unpopulated headers Dell may have left for factory debug. Would definitely be interested if you manage to confirm the location.