diff --git a/bootrom/bootrom.S b/bootrom/bootrom.S
index 76f2f1f4..6b2e973a 100644
--- a/bootrom/bootrom.S
+++ b/bootrom/bootrom.S
@@ -10,6 +10,8 @@ _start:
   sw zero, 0(a0) // clear the interrupt
   li a0, DRAM_BASE // program reset vector
   csrw mepc, a0 // return from interrupt to start of user program
+  csrr a0, mhartid // hartid for next level bootloader
+  la a1, _dtb // dtb address for next level bootloader
   mret
 
 .section .text.hang, "ax", @progbits
@@ -26,3 +28,5 @@ _hang:
 wfi_loop:
   wfi
   j wfi_loop
+
+_dtb:
diff --git a/bootrom/bootrom.img b/bootrom/bootrom.img
index 33cb9452..040dc666 100755
Binary files a/bootrom/bootrom.img and b/bootrom/bootrom.img differ