From: Hans <sungdgdhtryrt@gmail.com>

Old linux kernel rtl8139 drivers (ex. debian 2.1) uses outb to set the rx
mode for RxConfig. Unfortunatelly qemu does not support outb for RxConfig.

Signed-off-by: Hans <sungdgdhtryrt@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/rtl8139.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
index 897c86ec41..03a204ef8a 100644
--- a/hw/net/rtl8139.c
+++ b/hw/net/rtl8139.c
@@ -2738,7 +2738,11 @@ static void rtl8139_io_writeb(void *opaque, uint8_t addr, uint32_t val)
             }
 
             break;
-
+        case RxConfig:
+            DPRINTF("RxConfig write(b) val=0x%02x\n", val);
+            rtl8139_RxConfig_write(s,
+                (rtl8139_RxConfig_read(s) & 0xFFFFFF00) | val);
+            break;
         default:
             DPRINTF("not implemented write(b) addr=0x%x val=0x%02x\n", addr,
                 val);
-- 
2.42.0