[aes/pre_sca] Specify tool versions known to work with the Alma flow
Signed-off-by: Pirmin Vogel <vogelpi@lowrisc.org>
diff --git a/hw/ip/aes/pre_sca/alma/README.md b/hw/ip/aes/pre_sca/alma/README.md
index c387909..2966579 100644
--- a/hw/ip/aes/pre_sca/alma/README.md
+++ b/hw/ip/aes/pre_sca/alma/README.md
@@ -6,6 +6,10 @@
## Prerequisites
+Note that this flow is experimental. It has been developed using Yosys 0.9+4306
+(git sha1 3931b3a03) and sv2v v0.0.7-17-g499bd58. Other tool versions might not
+be compatible.
+
1. Download the Alma tool
Note that since we are primarily interested in verifying the masking of a
