1 /* 2 * Copyright (c) 2021, ARM Limited. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <libfdt.h> 8 9 #include <common/debug.h> 10 #include <common/fdt_fixup.h> 11 #include <common/fdt_wrappers.h> 12 13 #include <sunxi_private.h> 14 15 void sunxi_prepare_dtb(void *fdt) 16 { 17 int ret; 18 19 if (fdt == NULL || fdt_check_header(fdt) != 0) { 20 return; 21 } 22 23 ret = fdt_open_into(fdt, fdt, 0x10000); 24 if (ret < 0) { 25 ERROR("Preparing devicetree at %p: error %d\n", fdt, ret); 26 return; 27 } 28 29 #ifdef SUNXI_BL31_IN_DRAM 30 /* Reserve memory used by Trusted Firmware. */ 31 if (fdt_add_reserved_memory(fdt, "tf-a@40000000", BL31_BASE, 32 BL31_LIMIT - BL31_BASE)) { 33 WARN("Failed to add reserved memory nodes to DT.\n"); 34 return; 35 } 36 #endif 37 38 ret = fdt_pack(fdt); 39 if (ret < 0) { 40 ERROR("Failed to pack devicetree at %p: error %d\n", 41 fdt, ret); 42 } else { 43 clean_dcache_range((uintptr_t)fdt, fdt_blob_size(fdt)); 44 INFO("Changed devicetree.\n"); 45 } 46 } 47