From patchwork Thu Mar 13 22:46:59 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leif Lindholm X-Patchwork-Id: 3829501 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 33926BF540 for ; Thu, 13 Mar 2014 23:25:28 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 454F6202B4 for ; Thu, 13 Mar 2014 23:25:27 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3F24F2028D for ; Thu, 13 Mar 2014 23:25:26 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WOESP-00023c-Mu; Thu, 13 Mar 2014 22:50:34 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WOERi-0002G5-CJ; Thu, 13 Mar 2014 22:49:50 +0000 Received: from mail-wi0-f180.google.com ([209.85.212.180]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WOEQQ-000249-KB for linux-arm-kernel@lists.infradead.org; Thu, 13 Mar 2014 22:48:40 +0000 Received: by mail-wi0-f180.google.com with SMTP id hm4so1835283wib.13 for ; Thu, 13 Mar 2014 15:48:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=VtxQVUiF1zyPDpEsdIx/XbETT0iI/p5eokTaPoNhdl8=; b=VMVkJq9snqudP5DEF4+KGtF2kvYAgyHzLUXtiznKwzypdDjuyGKe52gSE4UH5EO7kF tm2BAEM8gbS71B04FFhn4pJ8YGLc3OzlguOsJ+op8t4XJBqz0VHliIvXHiBt1TUX/2wg NJy4qUxoqyA8+ryAo80MKuyV8jKhfgY0kW9xlWLO2pTsEj+HLQbpJgGRriUvdrHQ+Nnt reoBmxGgoXalOLK/IQi+0XqLukjCs/wPul5r+wd6RrxyT4o2UkB75nCxy2h9Hb0ICGnw 2zh0QNP7t2SHmm1ccBzCTUKnA5a+H2xXKrBA6dkBTB9ZYELssD+BjA19Pd/BZvwOajAZ RIkw== X-Gm-Message-State: ALoCoQnAroe6chpFAz4pMKAnlIPzeszZVhqB8izjBJUupgo+Ocn1AnSUUw1KZP7MXaH82CzwnGlC X-Received: by 10.194.90.107 with SMTP id bv11mr3746258wjb.11.1394750888738; Thu, 13 Mar 2014 15:48:08 -0700 (PDT) Received: from mohikan.mushroom.smurfnet.nu (cpc4-cmbg17-2-0-cust71.5-4.cable.virginm.net. [86.14.224.72]) by mx.google.com with ESMTPSA id dk9sm9072133wjb.4.2014.03.13.15.48.07 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 13 Mar 2014 15:48:08 -0700 (PDT) From: Leif Lindholm To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-efi@vger.kernel.org, catalin.marinas@arm.com, matt.fleming@intel.com Subject: [PATCH v2 06/15] doc: efi-stub.txt updates for ARM Date: Thu, 13 Mar 2014 22:46:59 +0000 Message-Id: <1394750828-16351-7-git-send-email-leif.lindholm@linaro.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1394750828-16351-1-git-send-email-leif.lindholm@linaro.org> References: <1394750828-16351-1-git-send-email-leif.lindholm@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140313_184830_857180_B3DB4ACF X-CRM114-Status: GOOD ( 15.73 ) X-Spam-Score: -2.6 (--) Cc: roy.franz@linaro.org, Leif Lindholm , msalter@redhat.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Roy Franz Update efi-stub.txt documentation to be more general and not x86 specific. Add ARM only "dtb=" command line option description. Signed-off-by: Roy Franz Signed-off-by: Leif Lindholm Acked-by: Grant Likely --- Documentation/efi-stub.txt | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/Documentation/efi-stub.txt b/Documentation/efi-stub.txt index c628788..26be7b0 100644 --- a/Documentation/efi-stub.txt +++ b/Documentation/efi-stub.txt @@ -1,13 +1,16 @@ The EFI Boot Stub --------------------------- -On the x86 platform, a bzImage can masquerade as a PE/COFF image, -thereby convincing EFI firmware loaders to load it as an EFI -executable. The code that modifies the bzImage header, along with the -EFI-specific entry point that the firmware loader jumps to are -collectively known as the "EFI boot stub", and live in +On the x86 and ARM platforms, a kernel zImage/bzImage can masquerade +as a PE/COFF image, thereby convincing EFI firmware loaders to load +it as an EFI executable. The code that modifies the bzImage header, +along with the EFI-specific entry point that the firmware loader +jumps to are collectively known as the "EFI boot stub", and live in arch/x86/boot/header.S and arch/x86/boot/compressed/eboot.c, -respectively. +respectively. For ARM the EFI stub is implemented in +arch/arm/boot/compressed/efi-header.S and +arch/arm/boot/compressed/efi-stub.c. EFI stub code that is shared +between architectures is in drivers/firmware/efi/efi-stub-helper.c. By using the EFI boot stub it's possible to boot a Linux kernel without the use of a conventional EFI boot loader, such as grub or @@ -23,7 +26,9 @@ The bzImage located in arch/x86/boot/bzImage must be copied to the EFI System Partition (ESP) and renamed with the extension ".efi". Without the extension the EFI firmware loader will refuse to execute it. It's not possible to execute bzImage.efi from the usual Linux file systems -because EFI firmware doesn't have support for them. +because EFI firmware doesn't have support for them. For ARM the +arch/arm/boot/zImage should be copied to the system partition, and it +may not need to be renamed. **** Passing kernel parameters from the EFI shell @@ -63,3 +68,11 @@ Notice how bzImage.efi can be specified with a relative path. That's because the image we're executing is interpreted by the EFI shell, which understands relative paths, whereas the rest of the command line is passed to bzImage.efi. + + +**** The "dtb=" option + +For the ARM architecture, we also need to be able to provide a device +tree to the kernel. This is done with the "dtb=" command line option, +and is processed in the same manner as the "initrd=" option that is +described above.