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)17int 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)24int 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