1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2018 Stefan Roese <sr@denx.de>
4  */
5 
6 #include <common.h>
7 #include <init.h>
8 #include <malloc.h>
9 #include <asm/addrspace.h>
10 #include <asm/global_data.h>
11 #include <linux/bitops.h>
12 #include <linux/io.h>
13 #include <linux/sizes.h>
14 
15 DECLARE_GLOBAL_DATA_PTR;
16 
dram_init(void)17 int dram_init(void)
18 {
19 	gd->ram_size = get_ram_size((void *)KSEG1, SZ_256M);
20 
21 	return 0;
22 }
23 
last_stage_init(void)24 int last_stage_init(void)
25 {
26 	void *src, *dst;
27 
28 	src = malloc(SZ_64K);
29 	dst = malloc(SZ_64K);
30 	if (!src || !dst) {
31 		printf("Can't allocate buffer for cache cleanup copy!\n");
32 		return 0;
33 	}
34 
35 	/*
36 	 * It has been noticed, that sometimes the d-cache is not in a
37 	 * "clean-state" when U-Boot is running on MT7688. This was
38 	 * detected when using the ethernet driver (which uses d-cache)
39 	 * and a TFTP command does not complete. Copying an area of 64KiB
40 	 * in DDR at a very late bootup time in U-Boot, directly before
41 	 * calling into the prompt, seems to fix this issue.
42 	 */
43 	memcpy(dst, src, SZ_64K);
44 	free(src);
45 	free(dst);
46 
47 	return 0;
48 }
49