From f10c1497babaf3010def44a999092a4b55e84460 Mon Sep 17 00:00:00 2001
From: root <root@ka-ata-killa.ourano.james.local>
Date: Wed, 3 Mar 2021 10:35:16 +0000
Subject: fix hang when ptp clock rolls over during fetch

---
 app/Makefile | 3 +++
 app/ptp.c    | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/app/Makefile b/app/Makefile
index 526a58f..4b7d33a 100644
--- a/app/Makefile
+++ b/app/Makefile
@@ -119,6 +119,9 @@ ds:
 debug: ${PROG}.elf
 	${PREFIX}-gdb -x gdb.script ${PROG}.elf 
 
+debugfl: ${PROG}.elf
+	${PREFIX}-gdb -x gdbfl.script ${PROG}.elf 
+
 #	openocd
 
 protos: ${CSRCS} 
diff --git a/app/ptp.c b/app/ptp.c
index 264918f..c05d0c3 100644
--- a/app/ptp.c
+++ b/app/ptp.c
@@ -80,11 +80,12 @@ uint64_t ptp_get (void)
 {
   uint32_t pl, ph;
 
-  ph = ETH_PTPTSHR;
 
   do {
+    ph = ETH_PTPTSHR;
     compiler_mb();
     pl = ETH_PTPTSLR;
+    compiler_mb();
   } while (ph != ETH_PTPTSHR);
 
   return ptp_to_u64 (pl, ph);
-- 
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