Whitelist all firmwares <= 0.5 on hfa for software rolling of ntime.
diff --git a/driver-hashfast.c b/driver-hashfast.c
index 9ba1d9a..6e9de97 100644
--- a/driver-hashfast.c
+++ b/driver-hashfast.c
@@ -1696,7 +1696,7 @@ restart:
/* Older firmwares actually had ntime rolling disabled so we
* can roll the work ourselves here to minimise the amount of
* work we need to generate. */
- if (info->firmware_version < 0.5 && base_work->drv_rolllimit > jobs) {
+ if (info->firmware_version < 0.6 && base_work->drv_rolllimit > jobs) {
base_work->drv_rolllimit--;
roll_work(base_work);
work = make_clone(base_work);