Rather than using the obscure 0x4567 magic value,
use a real random one.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Cédric Le Goater <clg@redhat.com>
---
 hw/sd/sd.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index a48010cfc1..ec58c5e2a6 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -46,6 +46,7 @@
 #include "qemu/error-report.h"
 #include "qemu/timer.h"
 #include "qemu/log.h"
+#include "qemu/guest-random.h"
 #include "qemu/module.h"
 #include "sdmmc-internal.h"
 #include "trace.h"
@@ -490,11 +491,6 @@ static void sd_set_csd(SDState *sd, uint64_t size)
 
 /* Relative Card Address register */
 
-static void sd_set_rca(SDState *sd)
-{
-    sd->rca += 0x4567;
-}
-
 static uint16_t sd_req_get_rca(SDState *s, SDRequest req)
 {
     if (sd_cmd_type[req.cmd] == sd_ac || sd_cmd_type[req.cmd] == sd_adtc) {
@@ -1107,7 +1103,7 @@ static sd_rsp_type_t sd_cmd_SEND_RELATIVE_ADDR(SDState *sd, SDRequest req)
     case sd_identification_state:
     case sd_standby_state:
         sd->state = sd_standby_state;
-        sd_set_rca(sd);
+        qemu_guest_getrandom_nofail(&sd->rca, sizeof(sd->rca));
         return sd_r6;
 
     default:
-- 
2.41.0