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

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Message-ID: <86802c440612122300k36e84f96x85ef25ebbf27077d@mail.gmail.com>
Date:	Tue, 12 Dec 2006 23:00:25 -0800
From:	"Yinghai Lu" <yinghai.lu@....com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Greg KH" <gregkh@...e.de>,
	"Peter Stuge" <stuge-linuxbios@....org>,
	linux-usb-devel@...ts.sourceforge.net,
	"Stefan Reinauer" <stepan@...esystems.de>,
	linux-kernel@...r.kernel.org, linuxbios@...uxbios.org,
	"Andi Kleen" <ak@...e.de>, "David Brownell" <david-b@...bell.net>
Subject: Re: [LinuxBIOS] [linux-usb-devel] [RFC][PATCH 0/2] x86_64 Early usb debug port support.

On 12/8/06, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> Your or I missed a bug fix/enhancement in there somewhere.
>

I found the problem. the __set_fixmap need to __va, so the entries
will be referred from PAGE_OFFSET.

solution will be
1. move enable_dbgp_console from setup_early_printk, and call it from
setup_arch after init_memory_mapping.
2. or make __set_fixmap can use __pa or pa()+__START_KERNEL_map in
addtion to _va.

please check attached updated patch that is your patch plus 1.

YH

View attachment "usb_debug.patch" of type "text/x-patch" (21884 bytes)