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.

---
 arch/arm/lib/bootm.c | 1 +
 1 file changed, 1 insertion(+)

index 4dbe6a5303..d14a8b5737 100644
@@ -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

Applied to u-boot/master, thanks!

Tom
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