This series adds support for SPL to RISC-V U-Boot. Images can be booted
via OpenSBI (FW_DYNAMIC firmware) or by directly jumping to them. In the
former case, OpenSBI and U-Boot proper are bundled as a FIT image and
made available to U-Boot SPL. Currently, only the QEMU board enables
U-Boot SPL with a dedicated configuration. It uses RAM as SPL boot
device.
On many RISC-V CPUs, the device tree is provided to U-Boot by the
first stage bootloader. This requires changes to U-Boot SPL (patches 1,
2 and 3), which modify the behavior on other boards as well.
To test this series, OpenSBI has to be compiled first. The
fw_dynamic.bin binary must be copied into the U-Boot root directory.
Alternatively, the location of the binary can be specified with the
OPENSBI environment variable. U-Boot can then be build as normal using
the configuration qemu-riscv64_spl_defconfig for 64-bit builds or
qemu-riscv32_spl_defconfig for 32-bit builds. The outputs from the build
process are the U-Boot SPL binary (spl/u-boot-spl.bin) and the U-Boot
FIT image (u-boot.itb) containing U-Boot proper and OpenSBI.
U-Boot can be run in QEMU with the following command.
qemu-system-riscv64 -nographic -machine virt -kernel spl/u-boot-spl \
-device loader,file=u-boot.itb,addr=0x80200000
Changes in v3:
- Rebase on u-boot-riscv/master
- Update commit message to include minimum version of OpenSBI
- Rebase on u-boot/master
- Add note on minimum version of OpenSBI
Changes in v2:
- Rebase on master and format documentation as reStructuredText
Lukas Auer (11):
fdtdec: make CONFIG_OF_PRIOR_STAGE available in SPL
Makefile: support building SPL FIT images without device trees
spl: fit: use U-Boot device tree when FIT image has no device tree
riscv: add run mode configuration for SPL
spl: support booting via RISC-V OpenSBI
riscv: add SPL support
riscv: support SPL stack and global data relocation
riscv: add a generic FIT generator script
riscv: set default FIT generator script and build target for SPL
builds
riscv: qemu: add SPL configuration
doc: update QEMU RISC-V documentation
Kconfig | 4 +-
Makefile | 8 +-
arch/Kconfig | 6 ++
arch/riscv/Kconfig | 36 +++++++--
arch/riscv/cpu/ax25/Kconfig | 6 +-
arch/riscv/cpu/cpu.c | 6 +-
arch/riscv/cpu/generic/Kconfig | 5 +-
arch/riscv/cpu/start.S | 62 ++++++++++++++-
arch/riscv/cpu/u-boot-spl.lds | 82 +++++++++++++++++++
arch/riscv/include/asm/encoding.h | 2 +-
arch/riscv/include/asm/spl.h | 31 ++++++++
arch/riscv/lib/Makefile | 8 +-
arch/riscv/lib/mkimage_fit_opensbi.sh | 100 ++++++++++++++++++++++++
arch/riscv/lib/spl.c | 48 ++++++++++++
board/emulation/qemu-riscv/Kconfig | 10 +++
board/emulation/qemu-riscv/MAINTAINERS | 2 +
board/emulation/qemu-riscv/qemu-riscv.c | 17 ++++
common/image.c | 1 +
common/spl/Kconfig | 17 ++++
common/spl/Makefile | 1 +
common/spl/spl.c | 8 +-
common/spl/spl_fit.c | 37 ++++++---
common/spl/spl_opensbi.c | 85 ++++++++++++++++++++
configs/qemu-riscv32_spl_defconfig | 11 +++
configs/qemu-riscv64_spl_defconfig | 12 +++
doc/board/emulation/qemu-riscv.rst | 60 +++++++++++++-
include/configs/qemu-riscv.h | 14 ++++
include/fdtdec.h | 2 +-
include/image.h | 1 +
include/opensbi.h | 40 ++++++++++
include/spl.h | 5 ++
lib/fdtdec.c | 6 +-
32 files changed, 691 insertions(+), 42 deletions(-)
create mode 100644 arch/riscv/cpu/u-boot-spl.lds
create mode 100644 arch/riscv/include/asm/spl.h
create mode 100755 arch/riscv/lib/mkimage_fit_opensbi.sh
create mode 100644 arch/riscv/lib/spl.c
create mode 100644 common/spl/spl_opensbi.c
create mode 100644 configs/qemu-riscv32_spl_defconfig
create mode 100644 configs/qemu-riscv64_spl_defconfig
create mode 100644 include/opensbi.h
--
2.21.0
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