diff --git a/bootloader/rustsbi-k210.bin b/bootloader/rustsbi-k210.bin
index 58d1c1a7..27987d68 100755
Binary files a/bootloader/rustsbi-k210.bin and b/bootloader/rustsbi-k210.bin differ
diff --git a/bootloader/rustsbi-qemu.bin b/bootloader/rustsbi-qemu.bin
index f293ced7..ddbf336a 100755
Binary files a/bootloader/rustsbi-qemu.bin and b/bootloader/rustsbi-qemu.bin differ
diff --git a/os/src/drivers/block/virtio_blk.rs b/os/src/drivers/block/virtio_blk.rs
index ed344342..6b386190 100644
--- a/os/src/drivers/block/virtio_blk.rs
+++ b/os/src/drivers/block/virtio_blk.rs
@@ -22,7 +22,7 @@ const VIRTIO0: usize = 0x10001000;
 pub struct VirtIOBlock(UPSafeCell<VirtIOBlk<'static>>);
 
 lazy_static! {
-    static ref QUEUE_FRAMES: UPSafeCell<Vec<FrameTracker>> = unsafe { 
+    static ref QUEUE_FRAMES: UPSafeCell<Vec<FrameTracker>> = unsafe {
         UPSafeCell::new(Vec::new())
     };
 }
diff --git a/os/src/trap/mod.rs b/os/src/trap/mod.rs
index d04e1aa4..01606fbd 100644
--- a/os/src/trap/mod.rs
+++ b/os/src/trap/mod.rs
@@ -116,7 +116,9 @@ pub fn trap_return() -> ! {
 
 #[no_mangle]
 pub fn trap_from_kernel() -> ! {
+    use riscv::register::sepc;
+    println!("stval = {:#x}, sepc = {:#x}", stval::read(), sepc::read());
     panic!("a trap {:?} from kernel!", scause::read().cause());
 }
 
-pub use context::{TrapContext};
+pub use context::TrapContext;
diff --git a/user/src/bin/huge_write.rs b/user/src/bin/huge_write.rs
index 25f92943..f9dafa17 100644
--- a/user/src/bin/huge_write.rs
+++ b/user/src/bin/huge_write.rs
@@ -24,13 +24,13 @@ pub fn main() -> i32 {
     }
     let f = f as usize;
     let start = get_time();
-    let size_mb = 5usize;
+    let size_mb = 1usize;
     for _ in 0..1024*size_mb {
         write(f, &buffer);
     }
     close(f);
     let time_ms = (get_time() - start) as usize;
     let speed_kbs = size_mb * 1000000 / time_ms;
-    println!("time cost = {}ms, write speed = {}KiB/s", time_ms, speed_kbs);
+    println!("{}MiB written, time cost = {}ms, write speed = {}KiB/s", size_mb, time_ms, speed_kbs);
     0
 }
\ No newline at end of file