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4e65ca00f3
Under the current implementation, booting from removable media using
a architecture-specific default image name, say BOOTAA64.EFI, is
supported only in distro_bootcmd script. See the commit 74522c898b35
("efi_loader: Add distro boot script for removable media").
This is, however, half-baked implementation because
1) UEFI specification requires this feature to be implemented as part
of Boot Manager's responsibility:
3 - Boot Manager
3.5.1 Boot via the Simple File Protocol
When booting via the EFI_SIMPLE_FILE_SYSTEM_PROTOCOL, the FilePath will
start with a device path that points to the device that implements the
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL or the EFI_BLOCK_IO_PROTOCOL. The next
part of the FilePath may point to the file name, including
subdirectories, which contain the bootable image. If the file name is
a null device path, the file name must be generated from the rules
defined below.
...
3.5.1.1 Removable Media Boot Behavior
To generate a file name when none is present in the FilePath, the
firmware must append a default file name in the form
\EFI\BOOT\BOOT{machine type short-name}.EFI ...
2) So (1) entails the hehavior that the user's preference of boot media
order should be determined by Boot#### and BootOrder variables.
With this patch, the semantics mentioned above is fully implemented.
For example, if you want to boot the system from USB and SCSI in this
order,
* define Boot0001 which contains only a device path to the USB device
(without any file path/name)
* define Boot0002 which contains only a device path to the SCSI device,
and
* set BootOrder to Boot0001:Boot0002
To avoid build error for sandbox, default file name "BOOTSANDBOX.efi"
is defined even if it is out of scope of UEFI specification.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
On sandbox use binary name corresponding to host architecture.
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
46 lines
948 B
C
46 lines
948 B
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* When a boot option does not provide a file path the EFI file to be
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* booted is \EFI\BOOT\$(BOOTEFI_NAME).EFI. The architecture specific
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* file name is defined in this include.
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*
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* Copyright (c) 2022, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*/
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#ifndef _EFI_DEFAULT_FILENAME_H
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#define _EFI_DEFAULT_FILENAME_H
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#include <host_arch.h>
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#undef BOOTEFI_NAME
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#if HOST_ARCH == HOST_ARCH_X86_64
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#define BOOTEFI_NAME "BOOTX64.EFI"
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#endif
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#if HOST_ARCH == HOST_ARCH_X86
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#define BOOTEFI_NAME "BOOTIA32.EFI"
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#endif
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#if HOST_ARCH == HOST_ARCH_AARCH64
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#define BOOTEFI_NAME "BOOTAA64.EFI"
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#endif
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#if HOST_ARCH == HOST_ARCH_ARM
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#define BOOTEFI_NAME "BOOTARM.EFI"
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#endif
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#if HOST_ARCH == HOST_ARCH_RISCV32
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#define BOOTEFI_NAME "BOOTRISCV32.EFI"
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#endif
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#if HOST_ARCH == HOST_ARCH_RISCV64
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#define BOOTEFI_NAME "BOOTRISCV64.EFI"
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#endif
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#ifndef BOOTEFI_NAME
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#error Unsupported UEFI architecture
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#endif
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#endif
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