diff --git a/config/derivlist.txt b/config/derivlist.txt
index a82339cfc..76f09ebf4 100644
--- a/config/derivlist.txt
+++ b/config/derivlist.txt
@@ -1432,5 +1432,6 @@ UART_SUPPORTED      0
 PLIC_SUPPORTED      0
 SPI_SUPPORTED       0
 
-
-
+derive breker rv64gc
+EXT_MEM_SUPPORTED   1
+EXT_MEM_BASE        64'h90000000