[U-Boot] [PATCH] armv7m: Disable D-cache when booting nommu(ARMv7M) Linux kernel

[U-Boot] [PATCH] armv7m: Disable D-cache when booting nommu(ARMv7M) Linux kernel

[Toshifumi NISHINAGA]

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 4dbe6a5303..d14a8b5737 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -359,6 +359,7 @@ 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) {
-- 
2.13.0

[U-Boot] armv7m: Disable D-cache when booting nommu(ARMv7M) Linux kernel

[Tom Rini]

On Mon, Jun 05, 2017 at 01:18:08AM +0900, tnishinaga.dev at gmail.com wrote:

> 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>

Applied to u-boot/master, thanks!

-- 
Tom
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