From: Michael Brown <mbrown-OViyBiuKJBuK421+ScFKDQ@public.gmane.org>
To: Matt Fleming
<matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>,
Yinghai Lu <yinghai-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Matt Fleming
<matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Linux Kernel Mailing List
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Ard Biesheuvel
<ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Leif Lindholm
<leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH] x86, eboot: Support initrd loaded above 4G
Date: Tue, 15 Jul 2014 16:24:21 +0100 [thread overview]
Message-ID: <53C547A5.3030500@fensystems.co.uk> (raw)
In-Reply-To: <20140715151025.GB32039-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
On 15/07/14 16:10, Matt Fleming wrote:
> Going forward, I suspect any attempts to use the EFI File Protocol are
> going to result in this kind of breakage, and that the only thing that
> can be relied upon is the Disk I/O Protocol.
>
> But doing Disk I/O would necessitate adding the in-kernel FAT driver to
> the EFI boot stub, which is a scary idea (though not without merit).
Booting via iPXE will give you an EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
(providing access to the initrd previously downloaded by iPXE). It will
also give you a dummy disk I/O protocol which always return EFI_NO_MEDIA.
In those circumstances, only the EFI_SIMPLE_FILE_SYSTEM_PROTOCOL will work.
Michael
WARNING: multiple messages have this Message-ID (diff)
From: Michael Brown <mbrown@fensystems.co.uk>
To: Matt Fleming <matt@console-pimps.org>, Yinghai Lu <yinghai@kernel.org>
Cc: Matt Fleming <matt.fleming@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
linux-efi@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Leif Lindholm <leif.lindholm@linaro.org>
Subject: Re: [PATCH] x86, eboot: Support initrd loaded above 4G
Date: Tue, 15 Jul 2014 16:24:21 +0100 [thread overview]
Message-ID: <53C547A5.3030500@fensystems.co.uk> (raw)
In-Reply-To: <20140715151025.GB32039@console-pimps.org>
On 15/07/14 16:10, Matt Fleming wrote:
> Going forward, I suspect any attempts to use the EFI File Protocol are
> going to result in this kind of breakage, and that the only thing that
> can be relied upon is the Disk I/O Protocol.
>
> But doing Disk I/O would necessitate adding the in-kernel FAT driver to
> the EFI boot stub, which is a scary idea (though not without merit).
Booting via iPXE will give you an EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
(providing access to the initrd previously downloaded by iPXE). It will
also give you a dummy disk I/O protocol which always return EFI_NO_MEDIA.
In those circumstances, only the EFI_SIMPLE_FILE_SYSTEM_PROTOCOL will work.
Michael
next prev parent reply other threads:[~2014-07-15 15:24 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-14 19:23 [PATCH] x86, eboot: Support initrd loaded above 4G Yinghai Lu
2014-06-14 19:23 ` Yinghai Lu
2014-06-18 14:28 ` Matt Fleming
[not found] ` <20140618142819.GN24049-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2014-07-09 18:26 ` Matt Fleming
2014-07-09 18:26 ` Matt Fleming
[not found] ` <20140709182651.GB15932-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2014-07-10 18:00 ` Yinghai Lu
2014-07-10 18:00 ` Yinghai Lu
[not found] ` <CAE9FiQVP6d5GhFBBmX5HDo0w0oKJSizdKvepq5t6vhGNj=W9sg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-07-11 7:40 ` Matt Fleming
2014-07-11 7:40 ` Matt Fleming
2014-07-15 15:10 ` Matt Fleming
[not found] ` <20140715151025.GB32039-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2014-07-15 15:24 ` Michael Brown [this message]
2014-07-15 15:24 ` Michael Brown
2014-07-15 15:44 ` H. Peter Anvin
2014-07-15 15:44 ` H. Peter Anvin
[not found] ` <53C54C62.8070403-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2014-07-16 14:34 ` Matt Fleming
2014-07-16 14:34 ` Matt Fleming
2014-07-16 14:45 ` Michael Brown
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