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    SubjectRe: EHCI debug documentation
    Yinghai Lu wrote:
    > On Tue, Mar 3, 2009 at 3:53 PM, Sarah Sharp <sarah.a.sharp@intel.com> wrote:
    >> Greetings,
    >>
    >> You wrote the EHCI debug port patch for early printk back in July 2008
    >> (commit 5c05917e7fe313a187ad6ebb94c1c6cf42862a0b). Can you add some
    >> documentation to the Documentation directory about how a Linux user
    >> would set up a system (cables, files to open to get the printks, etc.)?
    >
    > please check
    >
    > ==========================================================================================
    > USB Debug port using Howto
    >
    > 1. HW:
    >
    > a. target system need to have debug port
    >
    > 00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2
    > EHCI Controller #1 (rev 03) (prog-if 20 [EHCI])
    > Subsystem: Lenovo ThinkPad T61
    > 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 D routed to IRQ 19
    > Region 0: Memory at fe227000 (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 PME-Enable- DSel=0 DScale=0 PME+
    > Capabilities: [58] Debug port: BAR=1 offset=00a0
    > Kernel driver in use: ehci_hcd
    > Kernel modules: ehci-hcd
    > 00: 86 80 36 28 06 01 90 02 03 20 03 0c 00 00 00 00
    > 10: 00 70 22 fe 00 00 00 00 00 00 00 00 00 00 00 00
    > 20: 00 00 00 00 00 00 00 00 00 00 00 00 aa 17 ab 20
    > 30: 00 00 00 00 50 00 00 00 00 00 00 00 0b 04 00 00
    > 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > 50: 01 58 c2 c9 00 80 00 00 0a 00 a0 20 00 00 00 00
    > 60: 20 20 9f 01 00 00 00 00 01 00 00 01 00 00 08 80
    > 70: c0 00 17 3f 00 00 00 00 00 00 00 00 00 00 00 00
    > 80: 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00
    > 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > d0: 00 00 00 00 00 aa ff 00 00 00 00 00 00 00 00 00
    > e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    > f0: 00 00 00 00 88 85 40 00 86 0f 05 00 06 17 02 20
    >
    > b. netchip USB debug cable

    http://www.plxtech.com/products/NET2000/NET20DC/default.asp


    > c. console system: have USB port
    >
    > 2. SW setting
    > a. console system: need to have kernel config
    > CONFIG_USB_SERIAL_DEBUG
    > you should get /dev/ttyUSBx
    >
    > # cat /dev/ttyUSBx could get output
    >
    > b. target system: need to have kernel config
    > CONFIG_EARLY_PRINTK_DBGP
    >
    > boot command line: earlyprintk=dbgp
    >
    > c. for Nvidia Southbridge based system: kernel will try to probe and
    > find out which port has debug device connected.


    --
    ~Randy


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