[EHCI Debug Port] Linux fails to setup EHCI debug port

Mon, 17 Feb 2014 22:47:32 -0800 

Hi list,
Linux kernel (3.12.8) fails to setup EHCI debug port on my Sandy Bridge server. This seems to be a normal thing as I tried on other machines and got the same result. 

This is the EHCI host controller information (printed by lspci -vvv)


00:1a.0 USB controller: Intel Corporation C600/X79 series chipset USB2 
Enhanced Host Controller #2 (rev 05) (prog-if 20 [EHCI])


Subsystem: Intel Corporation Device 3584


Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ 
Stepping- SERR+ FastB2B- DisINTx-



Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-


Latency: 0

Interrupt: pin B routed to IRQ 22

Region 0: Memory at d0c20000 (32-bit, non-prefetchable) [size=1K]

Capabilities: [50] Power Management version 2

Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot+,D3cold+)

Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-

Capabilities: [58] Debug port: BAR=1 offset=00a0

Capabilities: [98] PCI Advanced Features

AFCap: TP+ FLR+

AFCtrl: FLR-

AFStatus: TP-

Kernel driver in use: ehci-pci


This is the Linux kernel log (printed by dmesg)

[0.000000] dbgp_num: 0

[0.000000] Found EHCI debug port on 00:1a.0

[0.000000] bar: 10 offset: 0a0

[0.000000] bar_val: d0c20000 offset: 0a0

[0.000000] ehci_bar: ffffffffff5fb000

[0.000000] dbgp: ehci BIOS state 00010001

[0.000000] dbgp: BIOS handoff

[0.000000] debug_port: 2

[0.000000] n_ports:2

[0.000000] dbgp:

[0.000000]Debug control: 00000000ehci cmd: 00080000ehci conf flg: 00000000

[0.000000]ehci status: 00001000ehci portsc: 00003000

[0.000000] portstatus1: 00003000

[0.000000] portstatus2: 00003000

[0.000000] dbgp: ehci reset done

[0.000000]Debug control: 00000000ehci cmd: 00080000ehci conf flg: 00000000

[0.000000]ehci status: 00001000ehci portsc : 00003000

[0.000000] dbgp: EHCI startup

[0.000000]Debug control: 40000000ehci cmd: 00080000ehci conf flg: 00000000

[0.000000]ehci status: 00001000ehci portsc: 00003000

[0.000000] ehci started

[0.000000] dbgp: reset port

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 00000004ehci portsc: 00001000

[0.000000] dbgp: Trying to force debug port online

[0.000000]Debug control: 40000000ehci cmd: 00080000ehci conf flg: 00000001

[0.000000]ehci status: 00001004ehci portsc: 00041005

[0.000000] dbgp: ehci reset done

[0.000000]Debug control: 00000000ehci cmd: 00080000ehci conf flg: 00000000

[0.000000]ehci status: 00001000ehci portsc: 00003000

[0.000000] dbgp: EHCI startup

[0.000000]Debug control: 40000000ehci cmd: 00080000ehci conf flg: 00000000

[0.000000]ehci status: 00001000ehci portsc: 00003000

[0.000000] ehci started

[0.000000] dbgp: reset port

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 00000004ehci portsc: 00001000

[0.000000] dbgp: EHCI startup

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 00000004ehci portsc: 00001000

[0.000000] ehci started

[0.000000] dbgp: reset port

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 00000004ehci portsc: 00001000

[0.000000] No device found in debug port

[0.000000] debug_port: 2

[0.000000] n_ports:2

[0.000000] dbgp:

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 0000000cehci portsc: 00001000

[0.000000] portstatus1: 00001803

[0.000000] portstatus2: 00001000

[0.000000] debug_port: 2

[0.000000] n_ports:2

[0.000000] dbgp:

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 0000000cehci portsc: 00001000

[0.000000] portstatus1: 00001803

[0.000000] portstatus2: 00001000

[0.000000] dbgp: ehci skip - already configured

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 0000000cehci portsc: 00001000

[0.000000] dbgp: EHCI startup

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 0000000cehci portsc: 00001000

[0.000000] ehci started

[0.000000] dbgp: reset port

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 0000000cehci portsc: 00001000

[0.000000] dbgp: Trying to force debug port online

[0.000000]Debug control: 40000000ehci cmd: 00080000ehci conf flg: 00000001

[0.000000]ehci status: 0000100cehci portsc: 00041005

[0.000000] dbgp: ehci reset done

[0.000000]Debug control: 00000000ehci cmd: 00080000ehci conf flg: 00000000

[0.000000]ehci status: 00001000ehci portsc: 00003000

[0.000000] dbgp: EHCI startup

[0.000000]Debug control: 40000000ehci cmd: 00080000ehci conf flg: 00000000

[0.000000]ehci status: 00001000ehci portsc: 00003000

[0.000000] ehci started

[0.000000] dbgp: reset port

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 00000004ehci portsc: 00001000

[0.000000] dbgp: EHCI startup

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 00000004ehci portsc: 00001000

[0.000000] ehci started

[0.000000] dbgp: reset port

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 00000004ehci portsc: 00001000

[0.000000] No device found in debug port

[0.000000] debug_port: 2

[0.000000] n_ports:2

[0.000000] dbgp:

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 0000000cehci portsc: 00001000

[0.000000] portstatus1: 00001803

[0.000000] portstatus2: 00001000

[0.000000] debug_port: 2

[0.000000] n_ports:2

[0.000000] dbgp:

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 0000000cehci portsc: 00001000

[0.000000] portstatus1: 00001803

[0.000000] portstatus2: 00001000

[0.000000] dbgp: ehci skip - already configured

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 0000000cehci portsc: 00001000

[0.000000] dbgp: EHCI startup

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 0000000cehci portsc: 00001000

[0.000000] ehci started

[0.000000] dbgp: reset port

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 0000000cehci portsc: 00001000

[0.000000] dbgp: Trying to force debug port online

[0.000000]Debug control: 40000000ehci cmd: 00080000ehci conf flg: 00000001

[0.000000]ehci status: 0000100cehci portsc: 00041005

[0.000000] dbgp: ehci reset done

[0.000000]Debug control: 00000000ehci cmd: 00080000ehci conf flg: 00000000

[0.000000]ehci status: 00001000ehci portsc: 00003000

[0.000000] dbgp: EHCI startup

[0.000000]Debug control: 40000000ehci cmd: 00080000ehci conf flg: 00000000

[0.000000]ehci status: 00001000ehci portsc: 00003000

[0.000000] ehci started

[0.000000] dbgp: reset port

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 00000004ehci portsc: 00001000

[0.000000] dbgp: EHCI startup

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 00000004ehci portsc: 00001000

[0.000000] ehci started

[0.000000] dbgp: reset port

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 00000004ehci portsc: 00001000

[0.000000] No device found in debug port

[0.000000] debug_port: 2

[0.000000] n_ports:2

[0.000000] dbgp:

[0.000000]Debug control: 40000000ehci cmd: 00080001ehci conf flg: 00000001

[0.000000]ehci status: 0000000cehci portsc: 00001000

[0.000000] portstatus1: 00001803

[0.000000] portstatus2: 00001000

[0.000000] ehci_setup failed

[0.000000] Malformed early option 'kgdbdbgp'


Is this a known issue? Is there any fix there for it?

Thanks,
baolu

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