da850evm: pass board revision info to kernel

there are two boards based on da850 SOC - OMAP-L138 and AM18x.
In order to differentiate between these two boards, revision id
is passed to kernel via second byte of ATAG_REVISION.

Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>

board/davinci/da8xxevm/da850evm.c

@@ -147,6 +147,8 @@ static const struct lpsc_resource lpsc[] = {
 #define CONFIG_DA850_EVM_MAX_CPU_CLK	300000000
 #endif
 
+#define REV_AM18X_EVM		0x100
+
 /*
  * get_board_rev() - setup to pass kernel board revision information
  * Returns:
@@ -172,7 +174,9 @@ u32 get_board_rev(void)
 		rev = 2;
 	else if (maxcpuclk >= 372000000)
 		rev = 1;
-
+#ifdef CONFIG_DA850_AM18X_EVM
+	rev |= REV_AM18X_EVM;
+#endif
 	return rev;
 }
 

include/configs/da850_am18xxevm.h

@@ -44,7 +44,7 @@
 #define CONFIG_SYS_HZ			1000
 #define CONFIG_SKIP_LOWLEVEL_INIT
 #define CONFIG_SYS_TEXT_BASE		0xc1080000
-
+#define CONFIG_DA850_AM18X_EVM
 /*
  * Memory Info
  */