Merge tag 'arc-more-updates-for-2018.11-rc2-2' of git://git.denx.de/u-boot-arc

More fixes and improvements for ARC here:

Fixes (this time included for real):
 * Take care of global uninitialized variables
   They used to be put right after .bss section and were never
   zeroed as they should be. Now merged with normal .bss

Improvements:
 * Print more verbose CPU info for boards built on real silicon
 * Add support for SD-card detection on all ARC boards
 * Quite a few fixes for IoT DK
   - Support reset by command
   - Print of CPU freq on boot
   - Link for eFlash etc

arch/arc/config.mk

@@ -43,7 +43,7 @@ PLATFORM_CPPFLAGS += -mcpu=archs
 endif
 
 PLATFORM_CPPFLAGS += -ffixed-r25 -D__ARC__ -gdwarf-2 -mno-sdata
-PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
+PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections -fno-common
 
 # Needed for relocation
 LDFLAGS_FINAL += -pie --gc-sections

arch/arc/lib/cpu.c

@@ -60,7 +60,7 @@ const char *decode_identity(void)
 	}
 }
 
-int print_cpuinfo(void)
+__weak int print_cpuinfo(void)
 {
 	printf("CPU:   %s\n", decode_identity());
 	return 0;