Date: Wed, 1 Oct 2014 02:24:53 -0400 From: "O'Connor, Daniel" <Daniel.O'Connor@emc.com> To: Adrian Chadd <adrian@freebsd.org> Cc: "O'Connor, Daniel" <Daniel.O'Connor@emc.com>, =?Windows-1252?Q?Jos=E9_P=E9rez_Arauzo?= <fbl@aoek.com>, FreeBSD Current <freebsd-current@freebsd.org>, Benjamin Kaduk <kaduk@mit.edu>, Garrett Cooper <yaneurabeya@gmail.com> Subject: Re: What do you use for kernel debugging? Message-ID: <3718AED6-9514-49F9-AF11-B47CFAF01161@emc.com> In-Reply-To: <CAJ-VmomrTiyUBr%2BpwtRjcUAanwRBDhvMr65rXFpw9nUkFFYm0A@mail.gmail.com> References: <20140928071641.M7664@beckpeccoz.com> <alpine.GSO.1.10.1409281553060.21571@multics.mit.edu> <20140929003358.M78145@aoek.com> <B3589A0F-AF06-4F7D-80C9-F614CFA21370@gmail.com> <542AC1C8.9030101@freebsd.org> <90CE0701-F1CB-41DF-B3D2-87816DC03DF9@emc.com> <CAJ-VmomrTiyUBr%2BpwtRjcUAanwRBDhvMr65rXFpw9nUkFFYm0A@mail.gmail.com>
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On 1 Oct 2014, at 14:33, Adrian Chadd <adrian@freebsd.org> wrote: > There's also something for XHCI. So I see.. Section 7.6 in here has details.. http://www.intel.com.au/content/dam/www/public/us/en/documents/technical-sp= ecifications/extensible-host-controler-interface-usb-xhci.pdf Interestingly unlike the EHCI version it does not require hardware between = the debugger and debugee, only a special cable. (see http://msdn.microsoft.= com/en-us/library/windows/hardware/hh439372(v=3Dvs.85).aspx) A quick search shows the cable is pretty cheap ($15 for a short one) > Please please write it for freebsd. :) Not sure I have the cycles :( >=20 > -a >=20 >=20 > On 30 September 2014 21:45, O'Connor, Daniel <Daniel.O'Connor@emc.com> wr= ote: >>=20 >> On 1 Oct 2014, at 0:14, Julian Elischer <julian@freebsd.org> wrote: >>> Unfortunately you can't use a USB serial as it requires the USB stack >>> be working before it can be used.. >>> similar with ethernet connected debugging which requires that the >>> driver for the ethernet hardware support it. >>> (which why we don't have it in the tree though it has been done >>> several times in the past). >>=20 >> There IS a USB debug standard, Linux has some code to support it. >>=20 >> I am not sure what percentage of hardware has it hooked up though (the h= ost controller has a designated debug port but it could physically be anyth= ing). >>=20 >> http://www.coreboot.org/EHCI_Debug_Port >>=20 >> The hardware is bit more expensive than a null modem or firewire cable t= hough :( >>=20 >> Regards, >> Daniel O=92Connor >>=20 >> Senior Software Engineer >> Isilon Platforms Team >>=20 >>=20 >>=20 >> _______________________________________________ >> freebsd-current@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-current >> To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.or= g" Regards, Daniel O=92Connor Senior Software Engineer Isilon Platforms Team
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