diff --git a/fw/.gitignore b/fw/.gitignore
index 0e8815f..105c692 100644
--- a/fw/.gitignore
+++ b/fw/.gitignore
@@ -1 +1 @@
-/fir
+/bsp
diff --git a/fw/hello-world/Makefile b/fw/hello-world/Makefile
index 376bd71..25c3cf6 100644
--- a/fw/hello-world/Makefile
+++ b/fw/hello-world/Makefile
@@ -13,5 +13,5 @@ LDFLAGS := -march=$(RISCV_ARCH) -mabi=$(RISCV_ABI)
 compiler := $(shell which riscv64-unknown-elf-gcc)
 TOOL_DIR=$(dir $(compiler))
 
-BSP_BASE = ../bsp
+BSP_BASE ?= ../bsp
 include $(BSP_BASE)/env/common-gcc.mk