1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright (C) 2018 Stefan Roese <sr@denx.de> 4 */ 5 6#include <event.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 15DECLARE_GLOBAL_DATA_PTR; 16 17int dram_init(void) 18{ 19 gd->ram_size = get_ram_size((void *)KSEG1, CONFIG_MAX_MEM_SIZE << 20); 20 21 return 0; 22} 23 24#ifndef CONFIG_SPL_BUILD 25static int last_stage_init(void) 26{ 27 void *src, *dst; 28 29 src = malloc(SZ_64K); 30 dst = malloc(SZ_64K); 31 if (!src || !dst) { 32 printf("Can't allocate buffer for cache cleanup copy!\n"); 33 return 0; 34 } 35 36 /* 37 * It has been noticed, that sometimes the d-cache is not in a 38 * "clean-state" when U-Boot is running on MT7688. This was 39 * detected when using the ethernet driver (which uses d-cache) 40 * and a TFTP command does not complete. Copying an area of 64KiB 41 * in DDR at a very late bootup time in U-Boot, directly before 42 * calling into the prompt, seems to fix this issue. 43 */ 44 memcpy(dst, src, SZ_64K); 45 free(src); 46 free(dst); 47 48 return 0; 49} 50EVENT_SPY_SIMPLE(EVT_LAST_STAGE_INIT, last_stage_init); 51#endif 52