[U-Boot] [PATCH v2 1/6] sunxi: disable Pine A64 model detection code on other boards

[Icenowy Zheng]

The Pine A64 Plus/non-Plus model detection code is now built on all
64-bit ARM SoCs, even if the code cannot be triggered when H5/H6 is in
use.

Disable them when the board is Pine A64 by adding a Kconfig option that
is only selected on Pine A64.

On GCC 7.3.1 this makes the size of the function reduces 184 bytes, and
saves a 104 byte strstr() function, then makes SPL on H6 succeed to
build.

Signed-off-by: Icenowy Zheng <icenowy at aosc.io>
---
This used to be a independently sent patch.

Changes in v2:
- Added a Kconfig option to restrict the code on only Pine A64.

 arch/arm/mach-sunxi/Kconfig   | 10 ++++++++++
 board/sunxi/board.c           |  5 ++++-
 configs/pine64_plus_defconfig |  1 +
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
index 686f38fec4..764337c643 100644
--- a/arch/arm/mach-sunxi/Kconfig
+++ b/arch/arm/mach-sunxi/Kconfig
@@ -970,4 +970,14 @@ config SPL_SPI_SUNXI
 	  sunxi SPI Flash. It uses the same method as the boot ROM, so does
 	  not need any extra configuration.
 
+config PINE64_DT_SELECTION
+	bool "Enable Pine64 device tree selection code"
+	depends on MACH_SUN50I
+	help
+	  The original Pine A64 and Pine A64+ are similar but different
+	  boards and can be differed by the DRAM size. Pine A64 has
+	  512MiB DRAM, and Pine A64+ has 1GiB or 2GiB. By selecting this
+	  option, the device tree selection code specific to Pine64 which
+	  utilizes the DRAM size will be enabled.
+
 endif
diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index d1d7f9f400..49f5695566 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -820,6 +820,7 @@ int board_fit_config_name_match(const char *name)
 #endif
 	};
 
+#ifdef CONFIG_PINE64_DT_SELECTION
 /* Differentiate the two Pine64 board DTs by their DRAM size. */
 	if (strstr(name, "-pine64") && strstr(cmp_str, "-pine64")) {
 		if ((gd->ram_size > 512 * 1024 * 1024))
@@ -829,5 +830,7 @@ int board_fit_config_name_match(const char *name)
 	} else {
 		return strcmp(name, cmp_str);
 	}
-}
 #endif
+	return strcmp(name, cmp_str);
+#endif
+}
diff --git a/configs/pine64_plus_defconfig b/configs/pine64_plus_defconfig
index 14ccc9ba05..a5b87b9063 100644
--- a/configs/pine64_plus_defconfig
+++ b/configs/pine64_plus_defconfig
@@ -3,6 +3,7 @@ CONFIG_ARCH_SUNXI=y
 CONFIG_SPL=y
 CONFIG_MACH_SUN50I=y
 CONFIG_RESERVE_ALLWINNER_BOOT0_HEADER=y
+CONFIG_PINE64_DT_SELECTION=y
 CONFIG_NR_DRAM_BANKS=1
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 # CONFIG_CMD_FLASH is not set
-- 
2.18.1