linux-kernel - [PATCH v2 2/2] mips: generic: allow not building DTB in

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Message-Id: <20180626115712.11643-2-alexandre.belloni@bootlin.com>
Date:   Tue, 26 Jun 2018 13:57:12 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     James Hogan <jhogan@...nel.org>, Ralf Baechle <ralf@...ux-mips.org>
Cc:     Paul Burton <paul.burton@...s.com>, linux-mips@...ux-mips.org,
        linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH v2 2/2] mips: generic: allow not building DTB in

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@...tlin.com>
---
Changes in v2:
 - rebased on v4.18-rc1

 arch/mips/Kconfig               | 1 -
 arch/mips/Makefile              | 2 +-
 arch/mips/generic/Kconfig       | 1 +
 arch/mips/generic/vmlinux.its.S | 2 ++
 4 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 3f9deec70b92..2cc43f51fa6f 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -85,7 +85,6 @@ 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 e2122cca4ae2..5c5d491d736e 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -401,7 +401,7 @@ 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/generic/Kconfig b/arch/mips/generic/Kconfig
index 08e33c6b2539..13692b84928e 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@...ault";
 
@@ -29,4 +30,5 @@
 			kernel = "kernel@0";
 		};
 	};
+#endif
 };
-- 
2.18.0