1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Image manipulator for Vybrid SoCs
4 *
5 * Derived from vybridimage.c
6 *
7 * (C) Copyright 2016 DENX Software Engineering GmbH
8 * Written-by: Albert ARIBAUD <albert.aribaud@3adev.fr>
9 */
10
11 #include "imagetool.h"
12 #include <compiler.h>
13 #include <image.h>
14
15 /*
16 * NAND page 0 boot header
17 */
18
19 struct nand_page_0_boot_header {
20 union {
21 uint32_t fcb[128];
22 uint8_t fcb_bytes[512];
23 }; /* 0x00000000 - 0x000001ff */
24 uint8_t sw_ecc[512]; /* 0x00000200 - 0x000003ff */
25 uint32_t padding[65280]; /* 0x00000400 - 0x0003ffff */
26 uint8_t ivt_prefix[1024]; /* 0x00040000 - 0x000403ff */
27 };
28
29 /* signature byte for a readable block */
30
31 static struct nand_page_0_boot_header vybridimage_header;
32
vybridimage_check_image_types(uint8_t type)33 static int vybridimage_check_image_types(uint8_t type)
34 {
35 if (type == IH_TYPE_VYBRIDIMAGE)
36 return EXIT_SUCCESS;
37 return EXIT_FAILURE;
38 }
39
vybridimage_sw_ecc(uint8_t byte)40 static uint8_t vybridimage_sw_ecc(uint8_t byte)
41 {
42 uint8_t bit0 = (byte & (1 << 0)) ? 1 : 0;
43 uint8_t bit1 = (byte & (1 << 1)) ? 1 : 0;
44 uint8_t bit2 = (byte & (1 << 2)) ? 1 : 0;
45 uint8_t bit3 = (byte & (1 << 3)) ? 1 : 0;
46 uint8_t bit4 = (byte & (1 << 4)) ? 1 : 0;
47 uint8_t bit5 = (byte & (1 << 5)) ? 1 : 0;
48 uint8_t bit6 = (byte & (1 << 6)) ? 1 : 0;
49 uint8_t bit7 = (byte & (1 << 7)) ? 1 : 0;
50 uint8_t res = 0;
51
52 res |= ((bit6 ^ bit5 ^ bit3 ^ bit2) << 0);
53 res |= ((bit7 ^ bit5 ^ bit4 ^ bit2 ^ bit1) << 1);
54 res |= ((bit7 ^ bit6 ^ bit5 ^ bit1 ^ bit0) << 2);
55 res |= ((bit7 ^ bit4 ^ bit3 ^ bit0) << 3);
56 res |= ((bit6 ^ bit4 ^ bit3 ^ bit2 ^ bit1 ^ bit0) << 4);
57
58 return res;
59 }
60
vybridimage_verify_header(unsigned char * ptr,int image_size,struct image_tool_params * params)61 static int vybridimage_verify_header(unsigned char *ptr, int image_size,
62 struct image_tool_params *params)
63 {
64 struct nand_page_0_boot_header *hdr =
65 (struct nand_page_0_boot_header *)ptr;
66 int idx;
67
68 if (hdr->fcb[1] != 0x46434220)
69 return -1;
70 if (hdr->fcb[2] != 1)
71 return -1;
72 if (hdr->fcb[7] != 64)
73 return -1;
74 if (hdr->fcb[14] != 6)
75 return -1;
76 if (hdr->fcb[30] != 0x0001ff00)
77 return -1;
78 if (hdr->fcb[43] != 1)
79 return -1;
80 if (hdr->fcb[54] != 0)
81 return -1;
82 if (hdr->fcb[55] != 8)
83 return -1;
84
85 /* check software ECC */
86 for (idx = 0; idx < sizeof(hdr->fcb_bytes); idx++) {
87 uint8_t sw_ecc = vybridimage_sw_ecc(hdr->fcb_bytes[idx]);
88 if (sw_ecc != hdr->sw_ecc[idx])
89 return -1;
90 }
91
92 return 0;
93 }
94
vybridimage_set_header(void * ptr,struct stat * sbuf,int ifd,struct image_tool_params * params)95 static void vybridimage_set_header(void *ptr, struct stat *sbuf, int ifd,
96 struct image_tool_params *params)
97 {
98 struct nand_page_0_boot_header *hdr =
99 (struct nand_page_0_boot_header *)ptr;
100 int idx;
101
102 /* fill header with 0x00 for first 56 entries then 0xff */
103 memset(&hdr->fcb[0], 0x0, 56*sizeof(uint32_t));
104 memset(&hdr->fcb[56], 0xff, 72*sizeof(uint32_t));
105 /* fill SW ecc and padding with 0xff */
106 memset(&hdr->sw_ecc[0], 0xff, sizeof(hdr->sw_ecc));
107 memset(&hdr->padding[0], 0xff, sizeof(hdr->padding));
108 /* fill IVT prefix with 0x00 */
109 memset(&hdr->ivt_prefix[0], 0x00, sizeof(hdr->ivt_prefix));
110
111 /* populate fcb */
112 hdr->fcb[1] = 0x46434220; /* signature */
113 hdr->fcb[2] = 0x00000001; /* version */
114 hdr->fcb[5] = 2048; /* page size */
115 hdr->fcb[6] = (2048+64); /* page + OOB size */
116 hdr->fcb[7] = 64; /* pages per block */
117 hdr->fcb[14] = 6; /* ECC mode 6 */
118 hdr->fcb[26] = 128; /* fw address (0x40000) in 2K pages */
119 hdr->fcb[27] = 128; /* fw address (0x40000) in 2K pages */
120 hdr->fcb[30] = 0x0001ff00; /* DBBT search area start address */
121 hdr->fcb[33] = 2048; /* BB marker physical offset */
122 hdr->fcb[43] = 1; /* DISBBM */
123 hdr->fcb[54] = 0; /* DISBB_Search */
124 hdr->fcb[55] = 8; /* Bad block search limit */
125
126 /* compute software ECC */
127 for (idx = 0; idx < sizeof(hdr->fcb_bytes); idx++)
128 hdr->sw_ecc[idx] = vybridimage_sw_ecc(hdr->fcb_bytes[idx]);
129 }
130
vybridimage_print_hdr_field(struct nand_page_0_boot_header * hdr,int idx)131 static void vybridimage_print_hdr_field(struct nand_page_0_boot_header *hdr,
132 int idx)
133 {
134 printf("header.fcb[%d] = %08x\n", idx, hdr->fcb[idx]);
135 }
136
vybridimage_print_header(const void * ptr)137 static void vybridimage_print_header(const void *ptr)
138 {
139 struct nand_page_0_boot_header *hdr =
140 (struct nand_page_0_boot_header *)ptr;
141 int idx;
142
143 for (idx = 0; idx < 56; idx++)
144 vybridimage_print_hdr_field(hdr, idx);
145 }
146
147 /*
148 * vybridimage parameters
149 */
150 U_BOOT_IMAGE_TYPE(
151 vybridimage,
152 "Vybrid Boot Image",
153 sizeof(vybridimage_header),
154 (void *)&vybridimage_header,
155 NULL,
156 vybridimage_verify_header,
157 vybridimage_print_header,
158 vybridimage_set_header,
159 NULL,
160 vybridimage_check_image_types,
161 NULL,
162 NULL
163 );
164