diff --git a/kernel/Makefile b/kernel/Makefile
index eae0e89..4321f80 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -112,6 +112,7 @@ build/x86_64/os.iso: $(kernel) $(grub_cfg)
 
 build/riscv32/os.iso: kernel
 	@cp $(rust_lib) $@
+	@cp $(rust_lib) $(kernel)
 
 $(kernel): kernel $(assembly_object_files) $(linker_script)
 	@$(ld) -n --gc-sections -T $(linker_script) -o $(kernel) \
diff --git a/kernel/src/arch/riscv32/io.rs b/kernel/src/arch/riscv32/io.rs
index e392e46..d529ef1 100644
--- a/kernel/src/arch/riscv32/io.rs
+++ b/kernel/src/arch/riscv32/io.rs
@@ -41,5 +41,5 @@ pub fn putfmt(fmt: Arguments) {
 
 const DATA: *mut u8 = 0x10000000 as *mut u8;
 const STATUS: *const u8 = 0x10000005 as *const u8;
-const CAN_READ: u8 = 1 << 1;
+const CAN_READ: u8 = 1 << 0;
 const CAN_WRITE: u8 = 1 << 5;
diff --git a/kernel/src/arch/riscv32/timer.rs b/kernel/src/arch/riscv32/timer.rs
index 0ddc916..f5960ae 100644
--- a/kernel/src/arch/riscv32/timer.rs
+++ b/kernel/src/arch/riscv32/timer.rs
@@ -27,7 +27,7 @@ pub fn init() {
 
 pub fn set_next() {
     // 100Hz @ QEMU
-    let timebase = 100000;
+    let timebase = 250000;
     set_timer(get_cycle() + timebase);
 }
 
diff --git a/kernel/src/memory.rs b/kernel/src/memory.rs
index 0da3fb3..3f88ff0 100644
--- a/kernel/src/memory.rs
+++ b/kernel/src/memory.rs
@@ -1,5 +1,5 @@
 pub use arch::paging::*;
-use bit_allocator::{BitAlloc, BitAlloc64K};
+use bit_allocator::{BitAlloc, BitAlloc4K};
 use consts::MEMORY_OFFSET;
 use spin::{Mutex, MutexGuard};
 use super::HEAP_ALLOCATOR;
@@ -10,7 +10,7 @@ pub use ucore_memory::memory_set::{MemoryArea, MemoryAttr, MemorySet as MemorySe
 pub type MemorySet = MemorySet_<InactivePageTable0>;
 
 lazy_static! {
-    pub static ref FRAME_ALLOCATOR: Mutex<BitAlloc64K> = Mutex::new(BitAlloc64K::default());
+    pub static ref FRAME_ALLOCATOR: Mutex<BitAlloc4K> = Mutex::new(BitAlloc4K::default());
 }
 
 pub fn alloc_frame() -> Option<usize> {
diff --git a/kernel/src/process/mod.rs b/kernel/src/process/mod.rs
index 6f207be..569f3d2 100644
--- a/kernel/src/process/mod.rs
+++ b/kernel/src/process/mod.rs
@@ -24,6 +24,7 @@ pub fn init() {
             processor
         })
     );
+    info!("process init end");
 }
 
 pub static PROCESSOR: Once<SpinNoIrqLock<Processor>> = Once::new();