Date: Wed, 1 Oct 2014 00:45:10 -0400 From: "O'Connor, Daniel" <Daniel.O'Connor@emc.com> To: Julian Elischer <julian@freebsd.org> Cc: =?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: <90CE0701-F1CB-41DF-B3D2-87816DC03DF9@emc.com> In-Reply-To: <542AC1C8.9030101@freebsd.org> 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>
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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=20 > be working before it can be used.. > similar with ethernet connected debugging which requires that the=20 > driver for the ethernet hardware support it. > (which why we don't have it in the tree though it has been done=20 > several times in the past). There IS a USB debug standard, Linux has some code to support it. I am not sure what percentage of hardware has it hooked up though (the host= controller has a designated debug port but it could physically be anything= ). http://www.coreboot.org/EHCI_Debug_Port The hardware is bit more expensive than a null modem or firewire cable thou= gh :( Regards, Daniel O=92Connor Senior Software Engineer Isilon Platforms Team
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