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Date: Sat, 17 Dec 2016 18:50:59 +0800
From: Dave Young <dyoung@redhat.com>
Subject: Re: [PATCH v1 2/2] firmware: dmi_scan: Pass dmi_entry_point to
 kexec'ed kernel
Message-ID: <20161217105059.GA6922@dhcp-128-65.nay.redhat.com>
References: <20161202195416.58953-1-andriy.shevchenko@linux.intel.com>
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To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>, kexec@lists.infradead.org, Eric Biederman <ebiederm@xmission.com>, Jean Delvare <jdelvare@suse.de>, linux-kernel@vger.kernel.org

On 12/16/16 at 02:18pm, Andy Shevchenko wrote:
> On Fri, 2016-12-16 at 10:32 +0800, Dave Young wrote:
> > On 12/15/16 at 12:28pm, Jean Delvare wrote:
> > > Hi Andy,
> > > =

> > > On Fri,=A0=A02 Dec 2016 21:54:16 +0200, Andy Shevchenko wrote:
> > > > Until now kexec'ed kernel has no clue where to look for DMI entry
> > > > point.
> > > > =

> > > > Pass it via kernel command line parameter in the same way as it's
> > > > done for ACPI
> > > > RSDP.
> > > =

> > > I am no kexec expert but this confuses me. Shouldn't the second
> > > kernel
> > > have access to the EFI systab as the first kernel does? It includes
> > > many more pointers than just ACPI and DMI tables, and it would seem
> > > inconvenient to have to pass all these addresses individually
> > > explicitly.
> > =

> > Yes, in modern linux kernel, kexec has the support for EFI, I think it
> > should work naturally at least in x86_64.
> =

> Thanks for this good news!
> =

> Unfortunately Intel Galileo is 32-bit platform.

Maybe you can try use efi=3Dnoruntime kernel parameter in kexec/kdump
kernel, see if it works or not.

> =

> -- =

> Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Intel Finland Oy

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