linux-kernel - Re: [PATCH 0/9] x86 EFI boot stub

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Date:	Fri, 26 Aug 2011 13:29:52 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Maarten Lankhorst <m.b.lankhorst@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/9] x86 EFI boot stub

On Thu, 2011-08-11 at 19:55 +0200, Maarten Lankhorst wrote: 
> > Hmm.. do you have early printk enabled? Can you hook up a serial console
> > to this machine?
> >
> I get no output on serial console with vmlinuz.efi so it crashes
> before 'early console in decompress_kernel' is printed.

Hey Maarten, sorry I took so long to respond to this.

OK, so you don't get any output on the serial console. Were you passing
"console=" on the kernel cmdline? If so, the best way to debug this hang
is to add,

	efi_call_phys4(sys_table->runtime->reset_system, EFI_RESET_COLD,
			EFI_SUCCESS, 0, NULL);

just after we setup 'sys_table' in efi_main(). If your machine resets,
then we at least know that the firmware loaded the bzImage correctly.

P.S which machine is this and what is the output of the 'ver' command?

-- 
Matt Fleming, Intel Open Source Technology Center

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