From 8f079cccb369995e46a2ab530d5d60b88c1e70bb Mon Sep 17 00:00:00 2001
From: "tnishinaga.dev@gmail.com" <tnishinaga.dev@gmail.com>
Date: Mon, 5 Jun 2017 01:18:08 +0900
Subject: [PATCH] armv7m: Disable D-cache when booting nommu(ARMv7M) Linux
kernel
Disable D-Cache is required when booting nommu Linux kernel.
(please see Linux kernel source "arch/arm/kernel/head-nommu.S")
U-Boot is enabled D-cache and I-Cache at startup.
However, it does not disable D-Cache before
booting nommu Linux kernel.
Therefore, I call dcache_disable()
when the CPU is ARMv7M to fix this problem.
Signed-off-by: Toshifumi NISHINAGA <tnishinaga.dev@gmail.com>
---
arch/arm/lib/bootm.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index 704849bd0c..b3e5d24a32 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -360,6 +360,7 @@ static void boot_jump_linux(bootm_headers_t *images, int flag)
#ifdef CONFIG_CPU_V7M
ulong addr = (ulong)kernel_entry | 1;
kernel_entry = (void *)addr;
+ dcache_disable();
#endif
s = getenv("machid");
if (s) {