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Date: Tue, 03 Mar 2009 17:36:11 -0800 From: Randy Dunlap <randy.dunlap@...cle.com> To: Yinghai Lu <yinghai@...nel.org> CC: Sarah Sharp <sarah.a.sharp@...el.com>, Greg KH <gregkh@...e.de>, "Eric W. Biederman" <ebiederm@...ssion.com>, Ingo Molnar <mingo@...e.hu>, linux-usb@...r.kernel.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: EHCI debug documentation Yinghai Lu wrote: > On Tue, Mar 3, 2009 at 3:53 PM, Sarah Sharp <sarah.a.sharp@...el.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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