linux-kernel - Re: [linux-usb-devel] [RFC][PATCH 0/2] x86

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Date:	Wed, 06 Dec 2006 14:37:29 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andi Kleen <ak@...e.de>
Cc:	David Brownell <david-b@...bell.net>, yinghai.lu@....com,
	stuge-linuxbios@....org, stepan@...esystems.de,
	linuxbios@...uxbios.org, linux-usb-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, gregkh@...e.de
Subject: Re: [linux-usb-devel] [RFC][PATCH 0/2] x86_64 Early usb debug port  support.

Andi Kleen <ak@...e.de> writes:

> \
>>   - Host, to which that console connects (through the debug device);
>>     runs usb_debug, much like any other usb-serial device
>
> My understanding was that the client could run in user 
> space only on top of libusb.

Looks like a normal serial port with greg's patch.
I still need to try it though.

> One reason is the one I covered in my last mail -- locking of the PCI
> type 1 ports.
>
> However I suppose it would be ok to switch Eric's code between early
> pci access and locked one once the PCI subsystem is up and running.
> Just don't forget bust_spinlocks()

No pci access on that path.

Eric
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