linux-kernel - Re: new x86 setup code hangs on Dell Inspiron 5150

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Message-ID: <46D7B817.3060304@zytor.com>
Date:	Thu, 30 Aug 2007 23:41:27 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Will Simoneau <simoneau@....uri.edu>
CC:	linux-kernel@...r.kernel.org
Subject: Re: new x86 setup code hangs on Dell Inspiron 5150

H. Peter Anvin wrote:
> Will Simoneau wrote:
>> While trying to put together a new kernel for my laptop (Dell I5150, as
>> in subject) I found that recent kernels just don't boot. Right after
>> grub loads the kernel, before the "Uncompressing Linux" message is
>> shown, it hangs. The BIOS appears to still be alive (ctrl-alt-del works,
>> keyboard lock LEDs respond). It seems to be caused by the new x86 setup
>> code.
>>
>> My kernel is Linus' git as of a1c582d0720f2eff61043e90711767decf37b917.
>> I bisected and confirmed that 4fd06960f120e02e9abc802a09f9511c400042a5
>> triggers a non-functioning boot.
>>
>> This system has Dell BIOS rev A38 and a P4 3.2 w/HT.
>>
>> What should I do next to debug this problem?
> 
> Can you put in some printf's in the code and see how far it gets?
> 

Specifically, the places to add printf's are to main() in main.c and 
go_to_protected_mode() in pm.c.

	-hpa
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