1 files changed, 26 insertions, 0 deletions
diff --git a/arch/mips/mach-mtmips/cpu.c b/arch/mips/mach-mtmips/cpu.c
index b0a6397d68f..7afc2c5940d 100644
--- a/arch/mips/mach-mtmips/cpu.c
+++ b/arch/mips/mach-mtmips/cpu.c
@@ -68,3 +68,29 @@ int print_cpuinfo(void)
 
 	return 0;
 }
+
+int last_stage_init(void)
+{
+	void *src, *dst;
+
+	src = malloc(SZ_64K);
+	dst = malloc(SZ_64K);
+	if (!src || !dst) {
+		printf("Can't allocate buffer for cache cleanup copy!\n");
+		return 0;
+	}
+
+	/*
+	 * It has been noticed, that sometimes the d-cache is not in a
+	 * "clean-state" when U-Boot is running on MT7688. This was
+	 * detected when using the ethernet driver (which uses d-cache)
+	 * and a TFTP command does not complete. Copying an area of 64KiB
+	 * in DDR at a very late bootup time in U-Boot, directly before
+	 * calling into the prompt, seems to fix this issue.
+	 */
+	memcpy(dst, src, SZ_64K);
+	free(src);
+	free(dst);
+
+	return 0;
+}