Add note for how to test redis

Makefile

@@ -73,6 +73,7 @@ busybox: $(busybox)
 nginx:
 ifneq ($(arch), riscv32)
 ifneq ($(shell uname), Darwin)
+	@echo Building nginx
 	mkdir -p $(out_dir)
 	@cd nginx && make arch=$(arch) all
 	@cp nginx/build/$(arch)/nginx $(out_dir)/nginx
@@ -82,6 +83,7 @@ endif
 redis:
 ifneq ($(arch), riscv64)
 ifneq ($(shell uname), Darwin)
+	@echo Building redis
 	@mkdir -p $(out_dir)
 	@cd redis && make arch=$(arch) all
 	@cp redis/build/$(arch)/redis-server $(out_dir)/redis-server
@@ -98,11 +100,13 @@ $(out_img): build rcore-fs-fuse
 	@rcore-fs-fuse $@ $(out_dir) zip
 
 $(out_qcow2): $(out_img)
+	@echo Generating sfsimg
 	@qemu-img convert -f raw $< -O qcow2 $@
 	@qemu-img resize $@ +1G
 
 rcore-fs-fuse:
 ifeq ($(shell which rcore-fs-fuse),)
+	@echo Installing rcore-fs-fuse
 	@cargo install rcore-fs-fuse --git https://github.com/rcore-os/rcore-fs --branch sefs
 endif
 

README.md

@@ -35,16 +35,35 @@ Output to `build/$(arch)`
 ## Support matrix
 
 |                    | x86_64 | aarch64 | riscv32 | riscv64 |
-| --------------------------- | ------ | ------- | ------- | ------- |
+| ------------------ | ------ | ------- | ------- | ------- |
 | ucore              | n      | y       | y       | y       |
 | rust               | y      | y       | y       | y       |
 | biscuit            | y      | y       | n       | y       |
-| nginx                       | y      | y       | n       | y       |
-| redis (build with redis=on) | y      | y       | y       | n       |
+| nginx (linux only) | y      | y       | n       | y       |
+| redis (linux only) | y      | y       | y       | n       |
 | busybox            | y      | y       | n       | y       |
 
 
 
+## How to use Redis
+
+After running commands above, you should be able to run redis-server in rCore. Then, start `redis-server` in rCore:
+
+```bash
+/> redis-server redis.conf
+```
+
+Then you should be able to connect to it using `redis-cli`:
+
+```bash
+$ redis-cli -h 10.0.0.2 set abc def
+OK
+$ redis-cli -h 10.0.0.2 get abc
+"def"
+```
+
+Note: `redis-cli` in rCore is not working at the time.
+
 
 ## Notice