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Subject[PATCH 2/2] mips: generic: allow not building DTB in
Date
Allow not building any DTB in the generic kernel so it gets smaller. This
is necessary for ocelot because it can be built as a legacy platform that
needs a built-in DTB and it can also handle a separate DTB once it is
updated with a more modern bootloader. In the latter case, it is preferable
to not include any DTB in the kernel image so it is smaller.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
arch/mips/Kconfig | 1 -
arch/mips/Makefile | 2 +-
arch/mips/boot/dts/mscc/Makefile | 2 +-
arch/mips/generic/Kconfig | 1 +
arch/mips/generic/vmlinux.its.S | 2 ++
5 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 225c95da23ce..61057761d096 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -81,7 +81,6 @@ choice
config MIPS_GENERIC
bool "Generic board-agnostic MIPS kernel"
select BOOT_RAW
- select BUILTIN_DTB
select CEVT_R4K
select CLKSRC_MIPS_GIC
select COMMON_CLK
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 5e9fce076ab6..3d3554c13710 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -404,7 +404,7 @@ endif
CLEAN_FILES += vmlinux.32 vmlinux.64

# device-trees
-core-$(CONFIG_BUILTIN_DTB) += arch/mips/boot/dts/
+core-y += arch/mips/boot/dts/

%.dtb %.dtb.S %.dtb.o: | scripts
$(Q)$(MAKE) $(build)=arch/mips/boot/dts arch/mips/boot/dts/$@
diff --git a/arch/mips/boot/dts/mscc/Makefile b/arch/mips/boot/dts/mscc/Makefile
index 8982b19504a3..437ec65ec14a 100644
--- a/arch/mips/boot/dts/mscc/Makefile
+++ b/arch/mips/boot/dts/mscc/Makefile
@@ -1,3 +1,3 @@
dtb-$(CONFIG_MSCC_OCELOT) += ocelot_pcb123.dtb

-obj-y += $(patsubst %.dtb, %.dtb.o, $(dtb-y))
+obj-($CONFIG_BUILTIN_DTB) += $(patsubst %.dtb, %.dtb.o, $(dtb-y))
diff --git a/arch/mips/generic/Kconfig b/arch/mips/generic/Kconfig
index 6564f18b2012..012f283f99c4 100644
--- a/arch/mips/generic/Kconfig
+++ b/arch/mips/generic/Kconfig
@@ -3,6 +3,7 @@ if MIPS_GENERIC

config LEGACY_BOARDS
bool
+ select BUILTIN_DTB
help
Select this from your board if the board must use a legacy, non-UHI,
boot protocol. This will cause the kernel to scan through the list of
diff --git a/arch/mips/generic/vmlinux.its.S b/arch/mips/generic/vmlinux.its.S
index 1a08438fd893..9c954f2ae561 100644
--- a/arch/mips/generic/vmlinux.its.S
+++ b/arch/mips/generic/vmlinux.its.S
@@ -21,6 +21,7 @@
};
};

+#if IS_ENABLED(CONFIG_BUILTIN_DTB)
configurations {
default = "conf@default";

@@ -29,4 +30,5 @@
kernel = "kernel@0";
};
};
+#endif
};
--
2.17.0
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