From: tnishinaga.dev@gmail.com <tnishinaga.dev@gmail.com>
Date: Sun, 4 Jun 2017 16:18:08 +0000 (+0900)
Subject: armv7m: Disable D-cache when booting nommu(ARMv7M) Linux kernel
X-Git-Tag: v2017.07-rc2~67
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=8f079cccb369995e46a2ab530d5d60b88c1e70bb;p=oweals%2Fu-boot.git

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>
---

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) {