From ab87f7d487cb848acd567d7f1f816382f46b33b9 Mon Sep 17 00:00:00 2001
From: Howard Mao <zhehao.mao@gmail.com>
Date: Wed, 7 Jun 2017 17:13:05 -0700
Subject: [PATCH] make sure first-stage bootloader loads a0 and a1 as expected
 by pk

---
 bootrom/bootrom.S   |   4 ++++
 bootrom/bootrom.img | Bin 96 -> 96 bytes
 2 files changed, 4 insertions(+)

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 33cb9452c485b99d58501878e8ff6ab9ee14cf04..040dc666e7b2323b84f57eb18dc12e0a4aa57049 100755
GIT binary patch
delta 26
hcmYdDm>|oq>hN(oD+9yiR#ui`1_gtOiXsyo6aZ!|2MPcH

delta 23
VcmYdDm>|o~pkTm&1Saa3001Y40=@tM