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Message-ID: <4D8A0EBA.6060202@teksavvy.com> Date: Wed, 23 Mar 2011 11:16:10 -0400 From: Mark Lord <kernel@...savvy.com> To: Alan Stern <stern@...land.harvard.edu> CC: Herbert Poetzl <herbert@...hfloor.at>, linux-kernel@...r.kernel.org, Bernhard Kaindl <bk@...e.de>, Andi Kleen <andi@...stfloor.org>, linux-usb@...r.kernel.org Subject: Re: debugging a modern laptop ... On 11-03-23 11:04 AM, Alan Stern wrote: > On Wed, 23 Mar 2011, Herbert Poetzl wrote: > >> >> Greetings! >> >> I'm trying to evaluate my options on debugging a recent >> laptop/notebook/table (and the Linux kernel on it of course) >> from early bootup to diagnostics when the machine has locked up ... .. > There _is_ support for a USB console (see CONFIG_USB_SERIAL_CONSOLE). > However it may not be useful for diagnosing problems during boot, > because obviously the console won't operate until the USB stack is in > place and running. .. If you are lucky enough to have an ExpressCard slot on the notebook, then lots of eBay sellers offer "Oxford chipset" serial/parallel ports in ExpressCard format. These provide "true" bus serial ports, which can be used as Linux consoles for low level kernel debugging, logs, panics, etc.. As a bonus, he parallel ports from the same chips can be used for homebrew JTAG adapters. -ml -- 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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