[boot-wrapper PATCH 1/5] Decouple V2M_SYS config by auto-detect dtb node

[Jaxson Han]

An auto-detect switch is added to make it an option to enable/disable
'arm,vexpress-sysreg', because not all platforms support this feature.

Signed-off-by: Jaxson Han <jaxson.han at arm.com>
---
 Makefile.am | 2 +-
 platform.c  | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index af694b7..e131207 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -19,7 +19,7 @@ NR_CPUS         := $(shell echo $(CPU_IDS) | tr ',' ' ' | wc -w)
 DEFINES		= -DCNTFRQ=$(CNTFRQ)
 DEFINES		+= -DCPU_IDS=$(CPU_IDS)
 DEFINES		+= -DNR_CPUS=$(NR_CPUS)
-DEFINES		+= -DSYSREGS_BASE=$(SYSREGS_BASE)
+DEFINES		+= $(if $(SYSREGS_BASE), -DSYSREGS_BASE=$(SYSREGS_BASE), )
 DEFINES		+= -DUART_BASE=$(UART_BASE)
 DEFINES		+= -DSTACK_SIZE=256
 
diff --git a/platform.c b/platform.c
index a528a55..d11f568 100644
--- a/platform.c
+++ b/platform.c
@@ -23,10 +23,12 @@
 
 #define PL011(reg)	((void *)UART_BASE + PL011_##reg)
 
+#ifdef SYSREGS_BASE
 #define V2M_SYS_CFGDATA		0xa0
 #define V2M_SYS_CFGCTRL		0xa4
 
 #define V2M_SYS(reg)	((void *)SYSREGS_BASE + V2M_SYS_##reg)
+#endif
 
 static void print_string(const char *str)
 {
@@ -59,6 +61,7 @@ void init_platform(void)
 
 	print_string("Boot-wrapper v0.2\r\n\r\n");
 
+#ifdef SYSREGS_BASE
 	/*
 	 * CLCD output site MB
 	 */
@@ -66,4 +69,5 @@ void init_platform(void)
 	/* START | WRITE | MUXFPGA | SITE_MB */
 	raw_writel((1 << 31) | (1 << 30) | (7 << 20) | (0 << 16),
 				V2M_SYS(CFGCTRL));
+#endif
 }
-- 
2.25.1