Move text base to higher location to avoid colliding with qemu BIOS

kernel/src/arch/mipsel/boot/entry.S

@@ -22,7 +22,7 @@ _start:
     mtc0  t0, $12
 
     # directly jump to main function
-    b rust_main
+    j rust_main
 	nop
 
     .section .bss.stack

kernel/src/arch/mipsel/boot/linker.ld

@@ -4,7 +4,7 @@
 OUTPUT_ARCH(riscv)
 ENTRY(_start)
 
-BASE_ADDRESS = 0x80000000;
+BASE_ADDRESS = 0x80100000;
 
 SECTIONS
 {

kernel/src/arch/mipsel/consts.rs

@@ -3,7 +3,7 @@
 
 pub use super::board::consts::*;
 
-pub const KERNEL_OFFSET: usize = 0x80000000;
+pub const KERNEL_OFFSET: usize = 0x80100000;
 
 pub const MEMORY_OFFSET: usize = 0x8000_0000;
 

kernel/src/fs/mod.rs

@@ -54,9 +54,9 @@ lazy_static! {
                 fn _user_img_start();
                 fn _user_img_end();
             }
+            println!("Sfs start {:x}, end {:x}", _user_img_start as usize, _user_img_end as usize);
             Arc::new(unsafe { device::MemBuf::new(_user_img_start, _user_img_end) })
         };
-
         let sfs = SimpleFileSystem::open(device).expect("failed to open SFS");
         sfs.root_inode()
     };