From 0eb9f93611f3fefb61d297c1e3fc1a288173ddae Mon Sep 17 00:00:00 2001
From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Fri, 1 Dec 2017 22:45:05 +0100
Subject: [PATCH] libboard/serwb: retry serwb initialization on error

---
 artiq/firmware/libboard/serwb.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/artiq/firmware/libboard/serwb.rs b/artiq/firmware/libboard/serwb.rs
index 87ad639e1..118320241 100644
--- a/artiq/firmware/libboard/serwb.rs
+++ b/artiq/firmware/libboard/serwb.rs
@@ -4,7 +4,12 @@ pub fn wait_init() {
     info!("waiting for AMC/RTM serwb bridge to be ready...");
     unsafe {
         csr::serwb_phy_amc::control_reset_write(1);
-        while csr::serwb_phy_amc::control_ready_read() == 0 {}
+        while csr::serwb_phy_amc::control_ready_read() == 0 {
+            if csr::serwb_phy_amc::control_error_read() == 1 {
+                info!("retry serwb initialization...");
+                csr::serwb_phy_amc::control_reset_write(1);
+            }
+        }
     }
     info!("done.");