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-rw-r--r--arch/mips/mach-mtmips/cpu.c26
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;
+}