mips: spl: Flush cache before jumping to U-Boot proper

This patch adds a MIPS specific jump_to_image_no_args() implementation,
which flushes the U-Boot proper image loaded from the boot device in
SPL before jumping to it.

It has been noticed on MT76x8, that this cache flush is needed. Other
MIPS platforms might need it as well.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Weijie Gao <weijie.gao@mediatek.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index 24a72d9..9ee1fcb 100644 (file)
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -12,5 +12,6 @@ obj-y += traps.o
 
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 obj-$(CONFIG_CMD_GO) += boot.o
+obj-$(CONFIG_SPL_BUILD) += spl.o
 
 lib-$(CONFIG_USE_PRIVATE_LIBGCC) += ashldi3.o ashrdi3.o lshrdi3.o

diff --git a/arch/mips/lib/spl.c b/arch/mips/lib/spl.c
new file mode 100644 (file)
index 0000000..7ba3e53
--- /dev/null
+++ b/arch/mips/lib/spl.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Stefan Roese <sr@denx.de>
+ */
+
+#include <common.h>
+#include <cpu_func.h>
+#include <spl.h>
+
+void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image)
+{
+       typedef void __noreturn (*image_entry_noargs_t)(void);
+       image_entry_noargs_t image_entry =
+               (image_entry_noargs_t)spl_image->entry_point;
+
+       /* Flush cache before jumping to application */
+       flush_cache((unsigned long)spl_image->load_addr, spl_image->size);
+
+       debug("image entry point: 0x%lx\n", spl_image->entry_point);
+       image_entry();
+}