Back out part of f4bcaa4fc2dc2f06d5632d3b74f43c25a6e7e845.If CONFIG_ARCH_IDLE_CUSTOM is defined, then it should not use the version of lc823450_idle.c in arch/arm/src/lc823450. That part was correct before the PR. If CONFIG_ARCH_IDLE_CUSTOM, then the build should use a custom IDLE loop in the board src/ directory.

arch/arm/Kconfig

@@ -124,7 +124,6 @@ config ARCH_CHIP_LC823450
 	select ARCH_HAVE_MULTICPU
 	select ARCH_HAVE_I2CRESET
 	select ARCH_GLOBAL_IRQDISABLE
-	select ARCH_IDLE_CUSTOM
 	---help---
 		ON Semiconductor LC823450 architectures (ARM dual Cortex-M3)
 

arch/arm/src/lc823450/Make.defs

@@ -89,7 +89,7 @@ CHIP_CSRCS += lc823450_syscontrol.c lc823450_gpio.c
 
 # Configuration-dependent LC823450 files
 
-ifeq ($(CONFIG_ARCH_IDLE_CUSTOM),y)
+ifneq ($(CONFIG_ARCH_IDLE_CUSTOM),y)
 CHIP_CSRCS += lc823450_idle.c
 endif
 

include/unistd.h

@@ -365,7 +365,7 @@ int     gethostname(FAR char *name, size_t size);
 int     sethostname(FAR const char *name, size_t size);
 #endif
 
-/* Get configurable system varaibles */
+/* Get configurable system variables */
 
 long    sysconf(int name);