Change in coreboot[master]: soc/amd/stoneyridge: Check UART index

[Marshall Dawson (Code Review)]

Marshall Dawson has uploaded this change for review. ( https://review.coreboot.org/21096

Change subject: soc/amd/stoneyridge: Check UART index
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soc/amd/stoneyridge: Check UART index

Verify that the caller to uart_platform_base() sends a valid index.
The Stoney Ridge APU has only two internal UARTs.

Change-Id: I9432571712bae15a604f4280ea5e0f81fd68604d
Signed-off-by: Marshall Dawson 
---
M src/soc/amd/stoneyridge/uart.c
1 file changed, 2 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/96/21096/1

diff --git a/src/soc/amd/stoneyridge/uart.c b/src/soc/amd/stoneyridge/uart.c
index 9cc0c94..016d77b 100644
--- a/src/soc/amd/stoneyridge/uart.c
+++ b/src/soc/amd/stoneyridge/uart.c
@@ -13,11 +13,13 @@
  * GNU General Public License for more details.
  */

+#include <assert.h>
 #include <console/uart.h>
 #include <soc/southbridge.h>

uintptr_t uart_platform_base(int idx)
 {
+	assert(idx <= 1 && idx >= 0);
    return (uintptr_t)(APU_UART0_BASE + 0x2000 * (idx & 1));
 }