ICX7150-C12P fails to boot – repeated DRAM Shmoo calibration failure (RMA request)

Mandjdang — Sat, 04 Jul 2026 01:57:02 GMT

Hello Ruckus Support,

I'm a Lennar Homes resident and my ICX7150 switch (ICX7150-12 PoE, PVT1; bootloader 10.1.27T225, Jan 16 2025 build) has stopped booting. I believe the unit has a hardware/DRAM fault and would like to request an RMA or replacement guidance.

Symptoms:
- The switch no longer completes boot. Only the SYST and PWR LEDs light up; the network is down.
- Via the USB-C console (9600 baud), the bootloader banner appears, then: "DRAM: Validate Shmoo parameters stored in flash ..... failed!"
- The bootloader then runs a full DDR memory recalibration (RD_EN, RD_EXTENDED, WR_EXTENDED, ADDR_EXTENDED shmoo plots), but on reaching the final CTRL_EXTENDED stage it hangs indefinitely and never reaches the "Enter 'b' to stop at boot monitor" prompt.
- This repeats identically on every boot attempt. I have observed at least two consecutive cycles ending in the same "failed!" validation, including after a full cold boot (power disconnected 60+ seconds).

Troubleshooting already performed:
- Followed the community guide "How to perform a Software recovery on an ICX7150 switch" up to the console step.
- Confirmed working console access (Silicon Labs CP210x driver installed, COM3, 9600/8/N/1, no flow control) — console output is received reliably, so the console path is not the issue.
- Multiple power cycles, including a 60-second cold boot.
- Software recovery via TFTP cannot be attempted because the unit never reaches the boot monitor prompt.

Since the failure occurs during DRAM training before any firmware loads, a software recovery does not appear possible. Could you please advise on RMA/replacement options for this unit?

Here is the ending of the hanged boot log:

Ruckus Networks Bootloader: 10.1.27T225 (Jan 16 2025 - 01:52:47 -0800)

Booted from partition 2
DRAM: Validate Shmoo parameters stored in flash ..... failed!
R04. Configure reference voltage
R08. ZQ calibration

***** Interface.......: 0
**** VDL step size...: 10.964 ps
**** UI size.........: 57.000 steps
**** Shmoo type......: RD_EN
*** UI shift........: Off or N/A
*** Calib mode......: 2D Byte-wise
*** Plot mode.......: 2D Byte-wise
** Byte............: 000
* Center X........: 000
* Center Y........: 000
0000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000111111111111111 11111111111111111111111111111111111111111111111111111111 1111111111111111111111111112222222222222222222222222222
0000000000111111111122222222223333333333444444444455555555 56666666666777777777788888888889999999999000000000011111 11112222222222333333333344444444445555555555666666666677 7777777888888888899999999990000000000111111111122222222
0123456789012345678901234567890123456789012345678901234567 90123456789012345678901234567890123456789012345678901234 67890123456789012345678901234567890123456789012345678901 3456789012345678901234567890123456789012345678901234567
000 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
004 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
008 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
012 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
016 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
020 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
024 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
028 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
032 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
036 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
040 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
044 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
048 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
052 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
056 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
060 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
064 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

***** Interface.......: 0
**** VDL step size...: 10.964 ps
**** UI size.........: 57.000 steps
**** Shmoo type......: RD_EN
*** UI shift........: Off or N/A
*** Calib mode......: 2D Byte-wise
*** Plot mode.......: 2D Byte-wise
** Byte............: 001
* Center X........: 000
* Center Y........: 000
0000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000111111111111111 11111111111111111111111111111111111111111111111111111111 1111111111111111111111111112222222222222222222222222222
0000000000111111111122222222223333333333444444444455555555 56666666666777777777788888888889999999999000000000011111 11112222222222333333333344444444445555555555666666666677 7777777888888888899999999990000000000111111111122222222
0123456789012345678901234567890123456789012345678901234567 90123456789012345678901234567890123456789012345678901234 67890123456789012345678901234567890123456789012345678901 3456789012345678901234567890123456789012345678901234567
000 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
004 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
008 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
012 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
016 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
020 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
024 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
028 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
032 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
036 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
040 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
044 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
048 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
052 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
056 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
060 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
064 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Switch details:
- Model: ICX7150-12 (PoE), PVT1
- Serial number: FEK3840R01A

Thank you,

Re: ICX7150-C12P fails to boot – repeated DRAM Shmoo calibration failure (RMA request)

Sgatjens — Mon, 06 Jul 2026 16:37:08 GMT

Hi  @Mandjdang

Greetings!!!

Thank you for sharing the requested information.

Based on the troubleshooting performed, your ICX-7150-C12P Switch is not responding properly, and the Software Recovery process has been unsuccessful. A hard reset was also attempted; however, the issue still persists.

As a result, this Switch unit appears to be defective and needs to be replaced through the RMA (Return Merchandise Authorization) process.

To initiate the replacement, Please use the private chat option to respond so we can proceed further. For your reference, I have included a screenshot below.

Please let me know if you have any queries in this regard.

Thank you again for your patience and understanding.

Kind regards,
Sofia Gätjens
Technical Support Engineer L2 TAC Wired | RUCKUS Networks

Re: ICX7150-C12P fails to boot – repeated DRAM Shmoo calibration failure (RMA request)

Sgatjens — Fri, 10 Jul 2026 13:56:23 GMT

Hi @Mandjdang

I’ve raised an RMA case and sent you a private message with the RMA details. You will receive further notifications from the RMA case.

Please check and let me know if you have any questions.

Thank you once again for your patience.

Kind regards,
Sofia Gätjens
Technical Support Engineer L2 TAC Wired | RUCKUS Networks

topic Re: ICX7150-C12P fails to boot – repeated DRAM Shmoo calibration failure (RMA request) in RUCKUS Support for Lennar Homes

ICX7150-C12P fails to boot – repeated DRAM Shmoo calibration failure (RMA request)

Re: ICX7150-C12P fails to boot – repeated DRAM Shmoo calibration failure (RMA request)

Re: ICX7150-C12P fails to boot – repeated DRAM Shmoo calibration failure (RMA request)