From: Leif Lindholm <leif.lindholm@linaro.org> To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-efi@vger.kernel.org Cc: patches@linaro.org, Roy Franz <roy.franz@linaro.org>, Leif Lindholm <leif.lindholm@linaro.org> Subject: [PATCH 04/22] efi-stub.txt updates for ARM Date: Wed, 5 Feb 2014 17:03:55 +0000 [thread overview] Message-ID: <1391619853-10601-5-git-send-email-leif.lindholm@linaro.org> (raw) In-Reply-To: <1391619853-10601-1-git-send-email-leif.lindholm@linaro.org> From: Roy Franz <roy.franz@linaro.org> 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 <roy.franz@linaro.org> Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Grant Likely <grant.likely@linaro.org> --- 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. -- 1.7.10.4
WARNING: multiple messages have this Message-ID (diff)
From: leif.lindholm@linaro.org (Leif Lindholm) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 04/22] efi-stub.txt updates for ARM Date: Wed, 5 Feb 2014 17:03:55 +0000 [thread overview] Message-ID: <1391619853-10601-5-git-send-email-leif.lindholm@linaro.org> (raw) In-Reply-To: <1391619853-10601-1-git-send-email-leif.lindholm@linaro.org> From: Roy Franz <roy.franz@linaro.org> 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 <roy.franz@linaro.org> Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Grant Likely <grant.likely@linaro.org> --- 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. -- 1.7.10.4
next prev parent reply other threads:[~2014-02-05 17:05 UTC|newest] Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-02-05 17:03 [PATCH 00/22] arm/arm64: UEFI stubs + runtime services Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-05 17:03 ` [PATCH 01/22] arm: break part of __soft_restart out into separate function Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-05 17:03 ` [PATCH 02/22] arm: add new asm macro update_sctlr Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-05 18:01 ` Will Deacon 2014-02-05 18:01 ` Will Deacon 2014-02-05 18:01 ` Will Deacon 2014-02-05 17:03 ` [PATCH 03/22] efi: add helper function to get UEFI params from FDT Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-13 11:17 ` Matt Fleming 2014-02-13 11:17 ` Matt Fleming 2014-02-13 11:17 ` Matt Fleming 2014-02-13 14:56 ` Mark Salter 2014-02-13 14:56 ` Mark Salter 2014-02-13 14:56 ` Mark Salter 2014-02-05 17:03 ` Leif Lindholm [this message] 2014-02-05 17:03 ` [PATCH 04/22] efi-stub.txt updates for ARM Leif Lindholm 2014-02-05 17:03 ` [PATCH 05/22] Add shared printk wrapper for consistent prefixing Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-05 17:34 ` Joe Perches 2014-02-05 17:34 ` Joe Perches 2014-02-05 17:34 ` Joe Perches 2014-02-05 17:03 ` [PATCH 06/22] Add helper functions used by arm/arm64 Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-13 11:26 ` Matt Fleming 2014-02-13 11:26 ` Matt Fleming 2014-02-13 11:26 ` Matt Fleming 2014-02-14 19:02 ` Roy Franz 2014-02-14 19:02 ` Roy Franz 2014-02-14 19:02 ` Roy Franz 2014-03-03 14:08 ` Matt Fleming 2014-03-03 14:08 ` Matt Fleming 2014-03-03 14:08 ` Matt Fleming 2014-03-04 7:48 ` Roy Franz 2014-03-04 7:48 ` Roy Franz 2014-03-04 7:48 ` Roy Franz 2014-02-05 17:03 ` [PATCH 07/22] Add shared FDT related functions for ARM/ARM64 Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-05 17:03 ` [PATCH 08/22] Add strstr to compressed string.c for ARM Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-05 17:03 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 09/22] Add shared arm/arm64 EFI stub Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 10/22] Add EFI stub for ARM Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 11/22] Disable stack protection for decompressor/stub Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 12/22] Documentation: arm: add UEFI support documentation Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 13/22] arm: Add [U]EFI runtime services support Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 14/22] init: efi: arm: enable (U)EFI runtime services on arm Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 15/22] lib: add fdt_empty_tree.c Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 16/22] arm64: Add function to create identity mappings Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-14 17:42 ` Catalin Marinas 2014-02-14 17:42 ` Catalin Marinas 2014-02-17 13:29 ` Mark Salter 2014-02-17 13:29 ` Mark Salter 2014-02-17 13:29 ` Mark Salter 2014-02-05 17:04 ` [PATCH 17/22] arm64: add EFI stub Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 18/22] doc: arm64: add description of EFI stub support Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 19/22] arm64: add EFI runtime services Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 20/22] Improve cmdline conversion Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 17:04 ` [PATCH 21/22] arm: efistub: ignore dtb= when UEFI SecureBoot is enabled Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm 2014-02-05 18:09 ` Ard Biesheuvel 2014-02-05 18:09 ` Ard Biesheuvel 2014-02-05 18:09 ` Ard Biesheuvel 2014-02-05 17:04 ` [PATCH 22/22] arm: update boot/compressed/.gitignore Leif Lindholm 2014-02-05 17:04 ` Leif Lindholm
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