examples: eliminate CONFIG_STANDALONE_LOAD_ADDR

CONFIG_STANDALONE_LOAD_ADDR has been used for examples/standalone
but not for examples/api.

The suitability of an address to load an ELF binary and run it does
not only depend on the architecture but also on the memory layout of
the board which is not reflected in the default value of
CONFIG_STANDALONE_LOAD_ADDR.

Commit 32b7e39 ("Convert CONFIG_STANDALONE_LOAD_ADDR to Kconfig")
set the default on RISC-V to 0x0 though most boards used 0x80200000
before the patch.

On most boards we can assume 8 MiB of memory available above $loadaddr.
So we can safely use $loadaddr + 4 MiB as load address for the standalone
example and eliminate CONFIG_STANDALONE_LOAD_ADDR altogether.

Fixes: 32b7e39 ("Convert CONFIG_STANDALONE_LOAD_ADDR to Kconfig")
Signed-off-by: Heinrich Schuchardt <[email protected]>

Author: xypron

api/Kconfig

@@ -19,24 +19,4 @@ config EXAMPLES
 	  U-Boot provides an API for standalone applications. Examples are
 	  provided in directory examples/.
 
-config STANDALONE_LOAD_ADDR
-	depends on EXAMPLES
-	hex "Address in memory to link standalone applications to"
-	default 0xffffffff80200000 if MIPS && 64BIT
-	default 0x8c000000 if SH
-	default 0x82000000 if ARC
-	default 0x80f00000 if MICROBLAZE
-	default 0x80300000 if ARCH_OMAP2PLUS || FSL_LSCH2 || FSL_LSCH3
-	default 0x80200000 if MIPS && 32BIT
-	default 0x0c100000 if ARM
-	default 0x02000000 if NIOS2
-	default 0x00040000 if PPC || X86
-	default 0x00020000 if M68K
-	default 0x0 if RISCV
-	default SYS_LOAD_ADDR
-	help
-	  This option defines a board specific value for the address where
-	  standalone program gets loaded, thus overwriting the architecture
-	  dependent default settings.
-
 endmenu

config.mk

@@ -76,4 +76,3 @@ export PLATFORM_CPPFLAGS
 export RELFLAGS
 export LDFLAGS_FINAL
 export LDFLAGS_STANDALONE
-export CONFIG_STANDALONE_LOAD_ADDR

examples/standalone/Makefile

@@ -7,6 +7,10 @@ extra-y        := hello_world
 extra-$(CONFIG_SPI_FLASH_ATMEL)    += atmel_df_pow2
 extra-$(CONFIG_PPC)                += sched
 
+# Environment variable loadaddr is set from CONFIG_SYS_LOAD_ADDR.
+# Run the examples 4 MiB above this address.
+LOAD_ADDR:=${shell printf 0x%X $$(( $(CONFIG_SYS_LOAD_ADDR) + 0x400000 ))}
+
 #
 # Some versions of make do not handle trailing white spaces properly;
 # leading to build failures. The problem was found with GNU Make 3.80.
@@ -46,7 +50,7 @@ endif
 # source file.
 ccflags-y += $(call cc-option,-fno-toplevel-reorder)
 
-LDFLAGS_STANDALONE	+= -Ttext $(CONFIG_STANDALONE_LOAD_ADDR)
+LDFLAGS_STANDALONE	+= -Ttext $(LOAD_ADDR)
 
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