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Subject[PATCH] RISC-V: Support built-in dtb
Date
Build the dtb into the kernel image.
If the DTB is given via bootloader, the external DTB is adopted first.

Signed-off-by: Zong Li <zongbox@gmail.com>
---
arch/riscv/Kconfig | 4 ++++
arch/riscv/Makefile | 9 +++++++++
arch/riscv/boot/Makefile | 17 +++++++++++++++++
arch/riscv/boot/dts/Makefile | 11 +++++++++++
arch/riscv/kernel/setup.c | 2 +-
5 files changed, 42 insertions(+), 1 deletion(-)
create mode 100644 arch/riscv/boot/Makefile
create mode 100644 arch/riscv/boot/dts/Makefile

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 2e15e85..831cbb9 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -189,6 +189,10 @@ config RISCV_ISA_C
config RISCV_ISA_A
def_bool y

+config RISCV_BUILTIN_DTB
+ string "Builtin DTB"
+ default ""
+
endmenu

menu "Kernel type"
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 6719dd3..baed60a 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -57,6 +57,12 @@ ifeq ($(CONFIG_CMODEL_MEDANY),y)
KBUILD_CFLAGS += -mcmodel=medany
endif

+ifneq '$(CONFIG_NDS32_BUILTIN_DTB)' '""'
+BUILTIN_DTB := y
+else
+BUILTIN_DTB := n
+endif
+
# GCC versions that support the "-mstrict-align" option default to allowing
# unaligned accesses. While unaligned accesses are explicitly allowed in the
# RISC-V ISA, they're emulated by machine mode traps on all extant
@@ -69,4 +75,7 @@ core-y += arch/riscv/kernel/ arch/riscv/mm/

libs-y += arch/riscv/lib/

+boot := arch/riscv/boot
+core-$(BUILTIN_DTB) += $(boot)/dts/
+
all: vmlinux
diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
new file mode 100644
index 0000000..003d697
--- /dev/null
+++ b/arch/riscv/boot/Makefile
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0
+
+targets := Image Image.gz
+
+$(obj)/Image: vmlinux FORCE
+ $(call if_changed,objcopy)
+
+$(obj)/Image.gz: $(obj)/Image FORCE
+ $(call if_changed,gzip)
+
+install: $(obj)/Image
+ $(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
+ $(obj)/Image System.map "$(INSTALL_PATH)"
+
+zinstall: $(obj)/Image.gz
+ $(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
+ $(obj)/Image.gz System.map "$(INSTALL_PATH)"
diff --git a/arch/riscv/boot/dts/Makefile b/arch/riscv/boot/dts/Makefile
new file mode 100644
index 0000000..b65d070
--- /dev/null
+++ b/arch/riscv/boot/dts/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+
+ifneq '$(CONFIG_RISCV_BUILTIN_DTB)' '""'
+BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_RISCV_BUILTIN_DTB)).dtb.o
+else
+BUILTIN_DTB :=
+endif
+
+obj-$(CONFIG_OF) += $(BUILTIN_DTB)
+
+clean-files := *.dtb *.dtb.S
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index e59a28c..3c89f3d 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -149,7 +149,7 @@ asmlinkage void __init setup_vm(void)

void __init sbi_save(unsigned int hartid, void *dtb)
{
- early_init_dt_scan(__va(dtb));
+ early_init_dt_scan(dtb ? __va(dtb) : __dtb_start);
}

/*
--
2.7.4
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