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,

topic 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)