[OpenBIOS] [PATCH] escc: explicitly mark variable containing incoming keyboard character as volatile

[Mark Cave-Ayland]

Otherwise the compiler may not understand that a read from the assigned buffer
is comming from memory-mapped IO space and fail to update accordingly.

Signed-off-by: Mark Cave-Ayland 
---
 drivers/escc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/escc.c b/drivers/escc.c
index 392625e..d9e1990 100644
--- a/drivers/escc.c
+++ b/drivers/escc.c
@@ -284,7 +284,7 @@ keyboard_dataready(void)
 unsigned char
 keyboard_readdata(void)
 {
-    unsigned char ch;
+    volatile unsigned char ch;

while (!keyboard_dataready()) { }