enable SD card on vf2

Makefile

@@ -32,7 +32,7 @@ QEMU := qemu-system-riscv64
 comma:= ,
 empty:=
 space:= $(empty) $(empty)
-
+SD ?= n
 
 ifeq ($(GUI),y)
 QEMU_ARGS += -device virtio-gpu-device \
@@ -44,7 +44,10 @@ endif
 
 
 ifeq ($(VF2),y)
-FEATURES += vf2 ramdisk
+FEATURES += vf2
+ifeq ($(SD),n)
+FEATURES += ramdisk
+endif
 else ifeq ($(UNMATCHED),y)
 FEATURES += hifive ramdisk
 else

subsystems/devices/src/lib.rs

@@ -213,7 +213,8 @@ fn init_block_device(blk: prob::DeviceInfo, mmio_transport: Option<MmioTransport
             #[cfg(not(feature = "ramdisk"))]
             {
                 use drivers::block_device::VF2SDDriver;
-                let block_device = VF2SDDriver::new();
+                let mut block_device = VF2SDDriver::new();
+                block_device.init();
                 let size = block_device.capacity();
                 println!("Block device size is {}MB", size * 512 / 1024 / 1024);
                 let block_device = Arc::new(GenericBlockDevice::new(Box::new(block_device)));

user/musl/ftest/src/main.rs

@@ -1,15 +1,22 @@
-use std::{fs::File, io::Read, time::Instant};
+use std::{env, fs::File, io::Read, time::Instant};
 
 fn main() {
-    read_bash_test();
+    let args: Vec<String> = env::args().collect();
+    if args.len() < 2 {
+        println!("Usage: {} <block size>", args[0]);
+        return;
+    }
+    let blk_size=  args[1].parse::<usize>().unwrap();
+    read_bash_test(blk_size);
     // in cache
-    read_bash_test();
+    read_bash_test(blk_size);
     // read_once_test();
 }
-fn read_bash_test() {
+
+fn read_bash_test(blk_size:usize) {
     let mut file = File::open("/tests/bash2").unwrap();
     let now = Instant::now();
-    let mut buf = [0u8; 4096];
+    let mut buf = vec![0u8; blk_size];
     let mut bytes = 0;
     loop {
         let res = file.read(&mut buf).unwrap();