1 /* 2 * (C) Copyright 2015 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 * 7 * Helper functions for Rockchip images 8 */ 9 10 #include "imagetool.h" 11 #include <image.h> 12 #include <rc4.h> 13 #include "mkimage.h" 14 #include "rkcommon.h" 15 16 enum { 17 RK_SIGNATURE = 0x0ff0aa55, 18 }; 19 20 /** 21 * struct header0_info - header block for boot ROM 22 * 23 * This is stored at SD card block 64 (where each block is 512 bytes, or at 24 * the start of SPI flash. It is encoded with RC4. 25 * 26 * @signature: Signature (must be RKSD_SIGNATURE) 27 * @disable_rc4: 0 to use rc4 for boot image, 1 to use plain binary 28 * @init_offset: Offset in blocks of the SPL code from this header 29 * block. E.g. 4 means 2KB after the start of this header. 30 * Other fields are not used by U-Boot 31 */ 32 struct header0_info { 33 uint32_t signature; 34 uint8_t reserved[4]; 35 uint32_t disable_rc4; 36 uint16_t init_offset; 37 uint8_t reserved1[492]; 38 uint16_t init_size; 39 uint16_t init_boot_size; 40 uint8_t reserved2[2]; 41 }; 42 43 static unsigned char rc4_key[16] = { 44 124, 78, 3, 4, 85, 5, 9, 7, 45 45, 44, 123, 56, 23, 13, 23, 17 46 }; 47 48 int rkcommon_set_header(void *buf, uint file_size) 49 { 50 struct header0_info *hdr; 51 52 if (file_size > CONFIG_ROCKCHIP_MAX_SPL_SIZE) 53 return -ENOSPC; 54 55 memset(buf, '\0', RK_INIT_OFFSET * RK_BLK_SIZE); 56 hdr = (struct header0_info *)buf; 57 hdr->signature = RK_SIGNATURE; 58 hdr->disable_rc4 = 1; 59 hdr->init_offset = RK_INIT_OFFSET; 60 61 hdr->init_size = (file_size + RK_BLK_SIZE - 1) / RK_BLK_SIZE; 62 hdr->init_size = (hdr->init_size + 3) & ~3; 63 hdr->init_boot_size = hdr->init_size + RK_MAX_BOOT_SIZE / RK_BLK_SIZE; 64 65 rc4_encode(buf, RK_BLK_SIZE, rc4_key); 66 67 return 0; 68 } 69