--- linux-2.6.9-rc2/drivers/serial/8250.c.orig	2004-09-13 07:31:29.000000000 +0200
+++ linux-2.6.9-rc2/drivers/serial/8250.c	2004-09-14 10:14:11.653931304 +0200
@@ -733,7 +733,8 @@
 #endif
 	serial_outp(up, UART_LCR, save_lcr);
 
-	up->port.fifosize = uart_config[up->port.type].fifo_size;
+	if (up->port.fifosize == 0)
+		up->port.fifosize = uart_config[up->port.type].fifo_size;
 	up->capabilities = uart_config[up->port.type].flags;
 	up->tx_loadsz = uart_config[up->port.type].tx_loadsz;