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roms: Add OpenSBI version 0.4

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Add OpenSBI version 0.4 as a git submodule and as a prebult binary.

OpenSBI (https://github.com/riscv/opensbi) aims to provide an open-source
reference implementation of the RISC-V Supervisor Binary Interface (SBI)
specifications for platform-specific firmwares executing in M-mode. For all
supported platforms, OpenSBI provides several runtime firmware examples.
These example firmwares can be used to replace the legacy riscv-pk bootloader
and enable the use of well-known bootloaders such as U-Boot.

OpenSBI is distributed under the terms of the BSD 2-clause license
("Simplified BSD License" or "FreeBSD License", SPDX: BSD-2-Clause). OpenSBI
source code also contains code reused from other projects desribed here:
https://github.com/riscv/opensbi/blob/master/ThirdPartyNotices.md.

In this case all of the code we are using from OpenSBI is BSD 2-clause
as we aren't using the Kendryte code (Apache-2.0) with QEMU and libfdt
is dual licensed as BSD 2-clause (and GPL-2.0+). OpenSBI isn't being
linked with QEMU either it is just being included with QEMU.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Alistair Francis 2019-07-16 11:47:22 -07:00 • committed by Palmer Dabbelt
parent 0b18cfb8f1
commit 91f3a2f0ce
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9 changed files with 68 additions and 21 deletions
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@ -1,13 +1,18 @@
The following points clarify the QEMU license:
The QEMU distribution includes both the QEMU emulator and
various firmware files. These are separate programs that are
distributed together for our users' convenience, and they have
separate licenses.
1) QEMU as a whole is released under the GNU General Public License,
version 2.
The following points clarify the license of the QEMU emulator:
2) Parts of QEMU have specific licenses which are compatible with the
GNU General Public License, version 2. Hence each source file contains
its own licensing information. Source files with no licensing information
are released under the GNU General Public License, version 2 or (at your
option) any later version.
1) The QEMU emulator as a whole is released under the GNU General
Public License, version 2.
2) Parts of the QEMU emulator have specific licenses which are compatible
with the GNU General Public License, version 2. Hence each source file
contains its own licensing information. Source files with no licensing
information are released under the GNU General Public License, version
2 or (at your option) any later version.
As of July 2013, contributions under version 2 of the GNU General Public
License (and no later version) are only accepted for the following files