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boot/opensbi: introduce BR2_TARGET_OPENSBI_FW_FDT_PATH

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If U-Boot CONFIG_OF_SEPARATE is defined [1], then the device tree will
be built and placed in a u-boot.dtb file alongside u-boot.bin.

When BR2_TARGET_UBOOT_FORMAT_DTB is enabled, buildroot will copy
u-boot.dtb to $(BINARIES_DIR).

This is useful for RISC-V platforms that want to build OpenSBI with an
external DTB by using FW_FDT_PATH [2].

[1] https://github.com/u-boot/u-boot/blob/master/doc/README.fdt-control
[2] https://github.com/riscv/opensbi/blob/master/docs/firmware/fw.md

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Drew Fustini <drew@beagleboard.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Drew Fustini 2021-06-15 22:03:41 -07:00 committed by Thomas Petazzoni
parent ce534677cb
commit 4210b26892
2 changed files with 13 additions and 0 deletions
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10
boot/opensbi/Config.in
View File

@ -109,4 +109,14 @@ config BR2_TARGET_OPENSBI_UBOOT_PAYLOAD
help
Build OpenSBI with the U-Boot as a Payload.
config BR2_TARGET_OPENSBI_FW_FDT_PATH
bool "Include U-Boot DTB in OpenSBI Payload"
depends on BR2_TARGET_OPENSBI_UBOOT_PAYLOAD
select BR2_TARGET_UBOOT_FORMAT_DTB
help
Build OpenSBI with FW_FDT_PATH set to
$(BINARIES_DIR)/u-boot.dtb. Note that CONFIG_OF_SEPARATE
must be set in the U-Boot configuration for this file to be
produced.
endif

3
boot/opensbi/opensbi.mk
View File

@ -46,6 +46,9 @@ endif
ifeq ($(BR2_TARGET_OPENSBI_UBOOT_PAYLOAD),y)
OPENSBI_DEPENDENCIES += uboot
OPENSBI_MAKE_ENV += FW_PAYLOAD_PATH="$(BINARIES_DIR)/u-boot.bin"
ifeq ($(BR2_TARGET_OPENSBI_FW_FDT_PATH),y)
OPENSBI_MAKE_ENV += FW_FDT_PATH="$(BINARIES_DIR)/u-boot.dtb"
endif
endif
define OPENSBI_BUILD_CMDS