From: Kumar Gala <galak@kernel.crashing.org>
Date: Fri, 11 Sep 2009 20:28:41 +0000 (-0500)
Subject: ppc/85xx: Disable all async interrupt sources when we boot
X-Git-Tag: v2009.11-rc1~111
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=15fba3279b56333bdb65ead366f82c945ed320d1;p=u-boot

ppc/85xx: Disable all async interrupt sources when we boot

We should make sure to clear MSR[ME, CE, DE] when we boot an OS image
since we have changed the exception vectors and the OSes vectors might
not be setup we should avoid async interrupts at all costs.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---

diff --git a/cpu/mpc85xx/cpu_init.c b/cpu/mpc85xx/cpu_init.c
index 48a82eda6d..a6d1e999b6 100644
--- a/cpu/mpc85xx/cpu_init.c
+++ b/cpu/mpc85xx/cpu_init.c
@@ -364,5 +364,16 @@ extern void setup_ivors(void);
 
 void arch_preboot_os(void)
 {
+	u32 msr;
+
+	/*
+	 * We are changing interrupt offsets and are about to boot the OS so
+	 * we need to make sure we disable all async interrupts. EE is already
+	 * disabled by the time we get called.
+	 */
+	msr = mfmsr();
+	msr &= ~(MSR_ME|MSR_CE|MSR_DE);
+	mtmsr(msr);
+
 	setup_ivors();
 }