[U-Boot] [PATCH 1/2 v4] env: only build env_embedded and envcrc when needed

[Mike Frysinger]

The env code is protected by the ENV_IS_EMBEDDED define, so attempting to
compile the code when this isn't defined is pointless.  Now that the env
headers have unified around CONFIG_ENV_IS_EMBEDDED, convert the build
system to only build the env objects when this is enabled.  And now that
the env code is conditionally compiled, we can drop the source code checks.

For people who want to extract the environment manually, add a new option
CONFIG_BUILD_ENVCRC that only enables the envcrc utility.

Signed-off-by: Mike Frysinger <vapier at gentoo.org>
---
v4
	- rename config option to CONFIG_BUILD_ENVCRC

 README                |    5 +++++
 common/Makefile       |    3 ---
 common/env_embedded.c |    7 -------
 include/common.h      |    5 +++++
 tools/Makefile        |    9 ++-------
 tools/envcrc.c        |   11 +----------
 6 files changed, 13 insertions(+), 27 deletions(-)

diff --git a/README b/README
index dee0e67..744f6bf 100644
--- a/README
+++ b/README
@@ -2305,6 +2305,11 @@ The following definitions that deal with the placement and management
 of environment data (variable area); in general, we support the
 following configurations:
 
+- CONFIG_BUILD_ENVCRC:
+
+	Builds up envcrc with the target environment so that external utils
+	may easily extract it and embed it in final U-Boot images.
+
 - CONFIG_ENV_IS_IN_FLASH:
 
 	Define this if the environment is in flash memory.
diff --git a/common/Makefile b/common/Makefile
index 3781738..a92a75f 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -52,9 +52,6 @@ COBJS-y += env_common.o
 COBJS-$(CONFIG_ENV_IS_IN_DATAFLASH) += env_dataflash.o
 COBJS-$(CONFIG_ENV_IS_IN_EEPROM) += env_eeprom.o
 COBJS-$(CONFIG_ENV_IS_EMBEDDED) += env_embedded.o
-COBJS-$(CONFIG_ENV_IS_IN_EEPROM) += env_embedded.o
-COBJS-$(CONFIG_ENV_IS_IN_FLASH) += env_embedded.o
-COBJS-$(CONFIG_ENV_IS_IN_NVRAM) += env_embedded.o
 COBJS-$(CONFIG_ENV_IS_IN_FLASH) += env_flash.o
 COBJS-$(CONFIG_ENV_IS_IN_MG_DISK) += env_mgdisk.o
 COBJS-$(CONFIG_ENV_IS_IN_NAND) += env_nand.o
diff --git a/common/env_embedded.c b/common/env_embedded.c
index ae6cac4..e27e1cd 100644
--- a/common/env_embedded.c
+++ b/common/env_embedded.c
@@ -41,11 +41,6 @@
 #endif
 
 /*
- * Generate embedded environment table
- * inside U-Boot image, if needed.
- */
-#if defined(ENV_IS_EMBEDDED)
-/*
  * Only put the environment in it's own section when we are building
  * U-Boot proper.  The host based program "tools/envcrc" does not need
  * a seperate section.  Note that ENV_CRC is only defined when building
@@ -210,5 +205,3 @@ unsigned long env_size __PPCTEXT__ = sizeof(env_t);
  * Add in absolutes.
  */
 GEN_ABS(env_offset, CONFIG_ENV_OFFSET);
-
-#endif /* ENV_IS_EMBEDDED */
diff --git a/include/common.h b/include/common.h
index f7c93bf..7df9afa 100644
--- a/include/common.h
+++ b/include/common.h
@@ -719,4 +719,9 @@ int cpu_release(int nr, int argc, char *argv[]);
 #define ALIGN(x,a)		__ALIGN_MASK((x),(typeof(x))(a)-1)
 #define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))
 
+/* Pull in stuff for the build system */
+#ifdef DO_DEPS_ONLY
+# include <environment.h>
+#endif
+
 #endif	/* __COMMON_H_ */
diff --git a/tools/Makefile b/tools/Makefile
index b04e3f3..2a9a9fd 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -69,13 +69,7 @@ include $(TOPDIR)/config.mk
 BIN_FILES-$(CONFIG_LCD_LOGO) += bmp_logo$(SFX)
 BIN_FILES-$(CONFIG_VIDEO_LOGO) += bmp_logo$(SFX)
 BIN_FILES-$(CONFIG_ENV_IS_EMBEDDED) += envcrc$(SFX)
-BIN_FILES-$(CONFIG_ENV_IS_IN_DATAFLASH) += envcrc$(SFX)
-BIN_FILES-$(CONFIG_ENV_IS_IN_EEPROM) += envcrc$(SFX)
-BIN_FILES-$(CONFIG_ENV_IS_IN_FLASH) += envcrc$(SFX)
-BIN_FILES-$(CONFIG_ENV_IS_IN_ONENAND) += envcrc$(SFX)
-BIN_FILES-$(CONFIG_ENV_IS_IN_NAND) += envcrc$(SFX)
-BIN_FILES-$(CONFIG_ENV_IS_IN_NVRAM) += envcrc$(SFX)
-BIN_FILES-$(CONFIG_ENV_IS_IN_SPI_FLASH) += envcrc$(SFX)
+BIN_FILES-$(CONFIG_BUILD_ENVCRC) += envcrc$(SFX)
 BIN_FILES-$(CONFIG_CMD_NET) += gen_eth_addr$(SFX)
 BIN_FILES-$(CONFIG_CMD_LOADS) += img2srec$(SFX)
 BIN_FILES-$(CONFIG_INCA_IP) += inca-swap-bytes$(SFX)
@@ -95,6 +89,7 @@ OBJ_FILES-$(CONFIG_LCD_LOGO) += bmp_logo.o
 OBJ_FILES-$(CONFIG_VIDEO_LOGO) += bmp_logo.o
 OBJ_FILES-y += default_image.o
 OBJ_FILES-$(CONFIG_ENV_IS_EMBEDDED) += envcrc.o
+OBJ_FILES-$(CONFIG_BUILD_ENVCRC) += envcrc.o
 OBJ_FILES-y += fit_image.o
 OBJ_FILES-$(CONFIG_CMD_NET) += gen_eth_addr.o
 OBJ_FILES-$(CONFIG_CMD_LOADS) += img2srec.o
diff --git a/tools/envcrc.c b/tools/envcrc.c
index 5b0f7cd..d02a7db 100644
--- a/tools/envcrc.c
+++ b/tools/envcrc.c
@@ -50,10 +50,6 @@
 # if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
 #  define CONFIG_ENV_SIZE_REDUND	CONFIG_ENV_SIZE
 # endif
-# if (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
-     ((CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <= (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN))
-#  define ENV_IS_EMBEDDED	1
-# endif
 # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT	1
 # endif
@@ -70,14 +66,11 @@
 
 extern uint32_t crc32 (uint32_t, const unsigned char *, unsigned int);
 
-#ifdef	ENV_IS_EMBEDDED
 extern unsigned int env_size;
 extern unsigned char environment;
-#endif	/* ENV_IS_EMBEDDED */
 
 int main (int argc, char **argv)
 {
-#ifdef	ENV_IS_EMBEDDED
 	unsigned char pad = 0x00;
 	uint32_t crc;
 	unsigned char *envptr = &environment,
@@ -131,8 +124,6 @@ int main (int argc, char **argv)
 	} else {
 		printf ("0x%08X\n", crc);
 	}
-#else
-	printf ("0\n");
-#endif
+
 	return EXIT_SUCCESS;
 }
-- 
1.6.5.rc2