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uart: timeout in putc and getc

--- a/sys/src/9/omap/uartomap.c

+++ b/sys/src/9/omap/uartomap.c

@@ -213,11 +213,16 @@

 omapuartgetc(Uart *uart)

 {

 	Ctlr *ctlr;

+	int i;

 	ctlr = uart->regs;

-	while(!(csr32r(ctlr, Rlsr) & LSRrxempty))

-		;

+	for(i = 0; i < 128; i++) {

+		if(csr32r(ctlr, Rlsr) & LSRrxempty)

+			break;

+		delay(1);

+	}

+

 	return csr32r(ctlr, Rrhr);

 }

@@ -225,10 +230,15 @@

 omapuartputc(Uart *uart, int c)

 {

 	Ctlr *ctlr;

+	int i;

 	ctlr = uart->regs;

-	while(!(csr32r(ctlr, Rlsr) & LSRtxempty))

-		;

+	for(i = 0; i < 128; i++) {

+		if(csr32r(ctlr, Rlsr) & LSRtxempty)

+			break;

+

+		delay(1);

+	}

 	csr32w(ctlr, Rthr, c);

 }