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dell.ps-on.user
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August 25th, 2025 01:36
Problem with garbled serial console on S3048-ON
Hi,
I have a Dell S3048-ON with unknown configuration that I'm trying to reset.
I have tried connecting the management port to the LAN, but it does not try to obtain a IP address from the server, the only packets observed coming out of the switch are LLDP broadcast about ManagementEthernet 1/1
So I made a cable to connect the RJ45 rs-232 port to a usb to serial port
I used an oscilloscope to ensure I had the right pinout, I am certain I have the switch's TX connected to the RX of my serial to usb adapter.
When the switch reboot, I can see garbled text come out.
I have tried changing to every baud rate that my adapter supports including 9600, 19200, 115200 and the ones inbetween, still no valid text appears !
I have tried 3 serial to usb cables, I have tried a serial to ethernet bridge, it all looks very similar and wrong.
For the other settings I have 8 data bit, 1 stop bit, parity none
I don't know what else to try.
My last two options are to try using a raspberry pi or an arduino to read the serial port data maybe ?
Is there a reset button on the switch, or a way to for it to boot ONIE installer on the USB so that I could telnet or ssh into it after it obtains an address from DHCP server ?
What else can I try ?
0
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Posted August 25th, 2025 03:26
Here it is, posting in picocom
root@srv4:~# picocom -b 115200 /dev/ttyS0 picocom v3.1 port is : /dev/ttyS0 flowcontrol : none baudrate is : 115200 parity is : none databits are : 8 stopbits are : 1 escape is : C-a local echo is : no noinit is : no noreset is : no hangup is : no nolock is : no send_cmd is : sz -vv receive_cmd is : rz -vv -E imap is : omap is : emap is : crcrlf,delbs, logfile is : none initstring : none exit_after is : not set exit is : no Type [C-a] [C-h] to see available commands Terminal ready ▒ BIOS Boot Selector for S3000 Primary BIOS 3.24.0.0-12 MMC Version 0x9: Last POR=0x11, Reset=0x3 CPLD JTAG to normal mode... done. Resetting... BIOS Boot Selector for S3000 Primary BIOS 3.24.0.0-12 MMC Version 0x9: Last POR=0x11, Reset=0x3 CPLD JTAG to normal mode... done. POST Configuration CPU Signature 406D8 CPU FamilyID=6, Model=4D, SteppingId=8, Processor=0 Microcode Revision 12D Platform ID: 0x10041837 PMG_CST_CFG_CTL: 0x40006 BBL_CR_CTL3: 0x7E2801FF Misc EN: 0x4000840081 Gen PM Con1: 0x3008 Therm Status: 0x884C0000 POST Control=0xEA010303, Status=0xE600F700 BIOS initializations... CPLD JTAG to normal mode... done. CPGC Memtest for Channel 0 .................. PASS ECC enabled: channel 0 DECCCTRL_DUNIT_REG=0x000200F3 SATA2 tuning... done POST: RTC Battery OK at last cold boot RTC date 8/24/2025 21:19:03 POST SPD test ............................... PASS POST Lower DRAM Memory test .... Perf cnt (curr,fixed): 0x27B0C82F0,0x3B88FC582 POST Lower DRAM Memory test ................. PASS POST Lower DRAM ECC check ................... PASS HDD Access .................................. PASS SMC Version 0xA Broadcom Preemphasis... Gen1=0x4, Gen2=0x43 done. POST PREEMPHASIS SETTING .................... PASS Disable BCM PCIe clock compensation... done. NPU CDR... reg 0x19: exp=0x191, read=0x181... reg 0x13: exp=0x190, read=0x180... done. SM Bus1 PHY... done DxE POST POST PCI test ............................... PASS POST NVRAM check ............................ PASS Critical Devices Test ....................... PASS POST overall test results ................... PASS POST exit: 00 F7 00 E6 03 03 00 EAVersion 2.16.1242. Copyright (C) 2013 American Megatrends, Inc. BIOS Date: 05/13/2022 19:53:45 Ver: 0ACBZ018 Press <DEL> or <F2> to enter setup. Grub 1.99~rc1 (Dell EMC) Built by root at gbbdev-maa-01 on Sat_Nov_25_13:20:52_UTC_2017 S3000ON Boot Flash Label 3.24.2.9 NetBoot Label 3.24.2.9 Press Esc to stop autoboot ... 0 Primary Boot not Configured Secondary Boot not Configured Booting DEFAULT configuration... boot device : flash file : systema (Dell EMC Networking OS system://A Partition) Image Product name FTOS-SG Match Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The NetBSD Foundation, Inc. All rights reserved. Copyright (c) 1982, 1986, 1989, 1991, 1993 The Regents of the University of California. All rights reserved. Dell EMC Networking OS Release 9.14(1.14) NetBSD 5.1_STABLE (S3000) #0: Tue Oct 25 11:28:34 PDT 2022 Detecting hardware...: EMC230x RPM based fan controller 0 swwdog0: software watchdog initialized done. WARNING: 2 errors while detecting hardware; check system log. WARNING: CHECK AND RESET THE DATE! route: writing to routing socket: File exists Partitioning 7641mb flash ....Pass! Mounting /boot RELEASE IMAGE HEADER DATA : -------------------------- Release Image SW Image Count : 5 Release Image Major-Version : 9 Release Image Minor Version : 14 Release Image Maint Version : 1 Release Image Patch-Version : 14 Release Image Header Size : 140 Release Image Data Size : 58258696 Release Image Platform Type : 24 Release Image Product Name : FTOS-SG Release Image Checksum Value : 0xb164bd72 Release Image Header Checksum: 0x3e8d46d9 Release Image Create Year : 2022 Release Image Create Month : 10 Release Image Create Date : 25 Release Image Create Hour : 11 Release Image Create Minute : 35 Release Image Create Second : 5 SOFTWARE IMAGE HEADER DATA : ---------------------------- Software Image[1] Major Version : 9 Software Image[1] Minor Version : 14 Software Image[1] Maint Version : 1 Software Image[1] Patch Version : 14 Software Image[1] Image type : 2 Software Image[1] Header Size : 100 Software Image[1] Img Data Size : 14579868 Software Image[1] Img Orig Size : 14579868 Software Image[1] Family Code : cp Software Image[1] Img file Name : CPRPLP-RPM-AP-9.14.1.14.bin Software Image[1] Hdr Checksum : 0xdbff1630 Software Image[1] Data Checksum : 0xf68de2bf SOFTWARE IMAGE HEADER DATA : ---------------------------- Software Image[2] Major Version : 9 Software Image[2] Minor Version : 14 Software Image[2] Maint Version : 1 Software Image[2] Patch Version : 14 Software Image[2] Image type : 2 Software Image[2] Header Size : 100 Software Image[2] Img Data Size : 20187296 Software Image[2] Img Orig Size : 82206720 Software Image[2] Family Code : nbsdpcprplp Software Image[2] Img file Name : NBSDPCPRPLP-RPM-AP-9.14.1.14.bin Software Image[2] Hdr Checksum : 0x5e2eca29 Software Image[2] Data Checksum : 0x13c0462a SOFTWARE IMAGE HEADER DATA : ---------------------------- Software Image[3] Major Version : 9 Software Image[3] Minor Version : 14 Software Image[3] Maint Version : 1 Software Image[3] Patch Version : 14 Software Image[3] Image type : 2 Software Image[3] Header Size : 100 Software Image[3] Img Data Size : 18309444 Software Image[3] Img Orig Size : 48906240 Software Image[3] Family Code : nbsdlib Software Image[3] Img file Name : NBSDLIB-RPM-AP-9.14.1.14.bin Software Image[3] Hdr Checksum : 0x17cde425 Software Image[3] Data Checksum : 0xe0acaeeb SOFTWARE IMAGE HEADER DATA : ---------------------------- Software Image[4] Major Version : 3 Software Image[4] Minor Version : 24 Software Image[4] Maint Version : 2 Software Image[4] Patch Version : 9 Software Image[4] Image type : 1 Software Image[4] Header Size : 100 Software Image[4] Img Data Size : 2629009 Software Image[4] Img Orig Size : 2629009 Software Image[4] Family Code : cp Software Image[4] Img file Name : CPRPLP-RPM-BT-3.24.2.9.bin Software Image[4] Hdr Checksum : 0xc500e1dc Software Image[4] Data Checksum : 0xf533613f SOFTWARE IMAGE HEADER DATA : ---------------------------- Software Image[5] Major Version : 3 Software Image[5] Minor Version : 24 Software Image[5] Maint Version : 0 Software Image[5] Patch Version : 0 Software Image[5] Image type : 3 Software Image[5] Header Size : 100 Software Image[5] Img Data Size : 2552579 Software Image[5] Img Orig Size : 2552579 Software Image[5] Family Code : cp Software Image[5] Img file Name : CPRPLP-RPM-SL-3.24.0.0-11.bin Software Image[5] Hdr Checksum : 0xf9d6026b Software Image[5] Data Checksum : 0x904cfa35 Starting Dell EMC Networking OS Aug 24 21:20:00 %S3048-ON:1 %POLLMGR-2-USER_FLASH_STATE: USB flash disk missing in 'usbflash:' Aug 24 21:20:01 %STKUNIT1-M:CP %RAM-6-ELECTION_ROLE: Stack-unit 1 is transitioning to Management Stack-unit. Aug 24 21:20:01 %STKUNIT1-M:CP %CRYPTO-5-FIPS_SELF_TEST_PASSED: [sysd] FIPS crypto module self-test passed Aug 24 21:20:01 %STKUNIT1-M:CP %CHMGR-5-STACKUNIT_DETECTED: stack-unit 1 present Aug 24 21:20:02 %STKUNIT1-M:CP %CHMGR-5-LPM_CONFIG: Applying the default IPv6 LPM partition config Aug 24 21:20:02 %STKUNIT1-M:CP %CHMGR-5-CHECKIN: Checkin from stack-unit 1 (type S3048-ON, 52 ports) Aug 24 21:20:03 %STKUNIT1-M:CP %CHMGR-5-PEM_INSERTED: Power entry module 2 of unit 1 is inserted Aug 24 21:20:03 %STKUNIT1-M:CP %CHMGR-0-PS_UP: Power supply 2 in unit 1 is up Aug 24 21:20:03 %S3048-ON:1 %CHMGR-2-FAN_SPEED_CHANGE: Fan speed changed to 40 % of the full speed Aug 24 21:20:03 %STKUNIT1-M:CP %CHMGR-5-FANTRAY_INSERTED: Fan tray 1 of Unit 1 is inserted Aug 24 21:20:03 %STKUNIT1-M:CP %CHMGR-5-FANTRAY_INSERTED: Fan tray 2 of Unit 1 is inserted Aug 24 21:20:03 %STKUNIT1-M:CP %CHMGR-5-FANTRAY_INSERTED: Fan tray 3 of Unit 1 is inserted Aug 24 21:20:03 %STKUNIT1-M:CP %CHMGR-5-PSU_FAN_STATUS: Fan 1 in PSU 2 of Unit 1 is up Aug 24 21:20:05 %STKUNIT1-M:CP %CHMGR-5-STACKUNIT_UP: stack-unit 1 is up Aug 24 21:20:09 %STKUNIT1-M:CP %RAM-5-STACKUNIT_STATE: Stack-unit 1 is in Active State. Aug 24 21:20:11 %STKUNIT1-M:CP %CHMGR-2-SYSTEM_READY: System ready Aug 24 21:20:20 %STKUNIT1-M:CP %CLI-6-SECURE_CLI_NOT_ENABLED: CLI security mode not enabled Aug 24 21:20:20 %STKUNIT1-M:CP %SEC-5-LOGIN_SUCCESS: Login successful on console DellEMC>Aug 24 21:22:37 %STKUNIT1-M:CP %CHMGR-4-TEMP_STATUS_CHANGE: Unit 1 temperature state changed to 1 (Current temperature 31C).0
0
Posted August 25th, 2025 03:30
Formatting got messed up
NOTE : I also wrote a very long post to
this thread
which included how to compile ONIE from the source code using a proxmox LXC
and when I pressed send, my entire post was lost
There is an issue on this forum :\
dell.ps-on.user
1 Rookie
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20 Posts
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2 Points
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Posted August 25th, 2025 03:24
I have figured it out
I was using these devices
one is a serial to usb, the other ethernet to usb
I think there is something wrong with the signalling voltages from the switch
even thought the oscilloscope traces show nice clean sharp signals
I remembered my old HP G8 DL380 server still has a real DB9 serial port
So ...
And that did it