From 911d6f693292dbf9b54de43f18ac95427e9accd8 Mon Sep 17 00:00:00 2001
From: Bin Meng <bmeng.cn@gmail.com>
Date: Sun, 22 May 2016 01:45:34 -0700
Subject: [PATCH] x86: quark: Assign a unique I/O APIC ID

After power-on, both LAPIC and I/O APIC appear with the same APIC ID
zero, which creates an ID conflict. When generating MP table, U-Boot
reports zero as the LAPIC ID in the processor entry, and zero as the
I/O APIC ID in the I/O APIC as well as the I/O interrupt assignment
entries. Such MP table confuses Linux kernel and finally a kernel
panic is seen during boot:

  BUG: unable to handle kernel paging request at ffff9000
  IP: [<c101d462>] native_io_apic_write+0x22/0x30
  *pdpt = 00000000014fb001 *pde = 00000000014ff067 *pte = 0000000000000000
  Oops: 0002 [#1]
  Modules linked in:
  Pid: 1, comm: swapper Tainted: G        W    3.8.7 #3 intel galileo/galileo
  EIP: 0060:[<c101d462>] EFLAGS: 00010086 CPU: 0
  EIP is at native_io_apic_write+0x22/0x30
  ...
  Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
 arch/x86/cpu/quark/quark.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/cpu/quark/quark.c b/arch/x86/cpu/quark/quark.c
index cf3fe7fb89..bdd360a99f 100644
--- a/arch/x86/cpu/quark/quark.c
+++ b/arch/x86/cpu/quark/quark.c
@@ -7,6 +7,7 @@
 #include <common.h>
 #include <mmc.h>
 #include <asm/io.h>
+#include <asm/ioapic.h>
 #include <asm/mrccache.h>
 #include <asm/mtrr.h>
 #include <asm/pci.h>
@@ -338,6 +339,9 @@ int arch_misc_init(void)
 	mrccache_save();
 #endif
 
+	/* Assign a unique I/O APIC ID */
+	io_apic_set_id(1);
+
 	return 0;
 }
 
-- 
2.39.5