armflash.c 7.03 KB
Newer Older
1 2 3 4 5 6 7 8 9 10
/*
 * (C) Copyright 2015
 * Linus Walleij, Linaro
 *
 * Support for ARM Flash Partitions
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */
#include <common.h>
#include <command.h>
11
#include <console.h>
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178
#include <asm/io.h>

#define MAX_REGIONS 4
#define MAX_IMAGES 32

struct afs_region {
	u32 load_address;
	u32 size;
	u32 offset;
};

struct afs_image {
	flash_info_t *flinfo;
	const char *name;
	u32 version;
	u32 entrypoint;
	u32 attributes;
	u32 region_count;
	struct afs_region regions[MAX_REGIONS];
	ulong flash_mem_start;
	ulong flash_mem_end;
};

static struct afs_image afs_images[MAX_IMAGES];
static int num_afs_images;

static u32 compute_crc(ulong start, u32 len)
{
	u32 sum = 0;
	int i;

	if (len % 4 != 0) {
		printf("bad checksumming\n");
		return 0;
	}

	for (i = 0; i < len; i += 4) {
		u32 val;

		val = readl((void *)start + i);
		if (val > ~sum)
			sum++;
		sum += val;
	}
	return ~sum;
}

static void parse_bank(ulong bank)
{
	int i;
	ulong flstart, flend;
	flash_info_t *info;

	info = &flash_info[bank];
	if (info->flash_id != FLASH_MAN_CFI) {
		printf("Bank %lu: missing or unknown FLASH type\n", bank);
		return;
	}
	if (!info->sector_count) {
		printf("Bank %lu: no FLASH sectors\n", bank);
		return;
	}

	flstart = info->start[0];
	flend = flstart + info->size;

	for (i = 0; i < info->sector_count; ++i) {
		ulong secend;
		u32 foot1, foot2;

		if (ctrlc())
			break;

		if (i == info->sector_count-1)
			secend = flend;
		else
			secend = info->start[i+1];

		/* Check for v1 header */
		foot1 = readl((void *)secend - 0x0c);
		if (foot1 == 0xA0FFFF9FU) {
			struct afs_image *afi = &afs_images[num_afs_images];
			ulong imginfo;

			afi->flinfo = info;
			afi->version = 1;
			afi->flash_mem_start = readl((void *)secend - 0x10);
			afi->flash_mem_end = readl((void *)secend - 0x14);
			afi->attributes = readl((void *)secend - 0x08);
			/* Adjust to even address */
			imginfo = afi->flash_mem_end + afi->flash_mem_end % 4;
			/* Record as a single region */
			afi->region_count = 1;
			afi->regions[0].offset = readl((void *)imginfo + 0x04);
			afi->regions[0].load_address =
				readl((void *)imginfo + 0x08);
			afi->regions[0].size = readl((void *)imginfo + 0x0C);
			afi->entrypoint = readl((void *)imginfo + 0x10);
			afi->name = (const char *)imginfo + 0x14;
			num_afs_images++;
		}

		/* Check for v2 header */
		foot1 = readl((void *)secend - 0x04);
		foot2 = readl((void *)secend - 0x08);
		/* This makes up the string "HSLFTOOF" flash footer */
		if (foot1 == 0x464F4F54U && foot2 == 0x464C5348U) {
			struct afs_image *afi = &afs_images[num_afs_images];
			ulong imginfo;
			u32 block_start, block_end;
			int j;

			afi->flinfo = info;
			afi->version = readl((void *)secend - 0x0c);
			imginfo = secend - 0x30 - readl((void *)secend - 0x10);
			afi->name = (const char *)secend - 0x30;

			afi->entrypoint = readl((void *)imginfo+0x08);
			afi->attributes = readl((void *)imginfo+0x0c);
			afi->region_count = readl((void *)imginfo+0x10);
			block_start = readl((void *)imginfo+0x54);
			block_end = readl((void *)imginfo+0x58);
			afi->flash_mem_start = afi->flinfo->start[block_start];
			afi->flash_mem_end = afi->flinfo->start[block_end];

			/*
			 * Check footer CRC, the algorithm saves the inverse
			 * checksum as part of the summed words, and thus
			 * the result should be zero.
			 */
			if (compute_crc(imginfo + 8, 0x88) != 0) {
				printf("BAD CRC on ARM image info\n");
				printf("(continuing anyway)\n");
			}

			/* Parse regions */
			for (j = 0; j < afi->region_count; j++) {
				afi->regions[j].load_address =
					readl((void *)imginfo+0x14 + j*0x10);
				afi->regions[j].size =
					readl((void *)imginfo+0x18 + j*0x10);
				afi->regions[j].offset =
					readl((void *)imginfo+0x1c + j*0x10);
				/*
				 * At offset 0x20 + j*0x10 there is a region
				 * checksum which seems to be the running
				 * sum + 3, however since we anyway checksum
				 * the entire footer this is skipped over for
				 * checking here.
				 */
			}
			num_afs_images++;
		}
	}
}

static void parse_flash(void)
{
	ulong bank;

	/* We have already parsed the images in flash */
	if (num_afs_images > 0)
		return;
	for (bank = 0; bank < CONFIG_SYS_MAX_FLASH_BANKS; ++bank)
		parse_bank(bank);
}

179
static int load_image(const char * const name, const ulong address)
180 181 182 183 184 185 186 187 188 189 190 191 192 193 194
{
	struct afs_image *afi = NULL;
	int i;

	parse_flash();
	for (i = 0; i < num_afs_images; i++) {
		struct afs_image *tmp = &afs_images[i];

		if (!strcmp(tmp->name, name)) {
			afi = tmp;
			break;
		}
	}
	if (!afi) {
		printf("image \"%s\" not found in flash\n", name);
195
		return CMD_RET_FAILURE;
196 197 198 199 200 201 202 203 204 205 206 207
	}

	for (i = 0; i < afi->region_count; i++) {
		ulong from, to;

		from = afi->flash_mem_start + afi->regions[i].offset;
		if (address) {
			to = address;
		} else if (afi->regions[i].load_address) {
			to = afi->regions[i].load_address;
		} else {
			printf("no valid load address\n");
208
			return CMD_RET_FAILURE;
209 210 211 212 213 214 215 216 217 218
		}

		memcpy((void *)to, (void *)from, afi->regions[i].size);

		printf("loaded region %d from %08lX to %08lX, %08X bytes\n",
		       i,
		       from,
		       to,
		       afi->regions[i].size);
	}
219
	return CMD_RET_SUCCESS;
220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
}

static void print_images(void)
{
	int i;

	parse_flash();
	for (i = 0; i < num_afs_images; i++) {
		struct afs_image *afi = &afs_images[i];
		int j;

		printf("Image: \"%s\" (v%d):\n", afi->name, afi->version);
		printf("    Entry point: 0x%08X\n", afi->entrypoint);
		printf("    Attributes: 0x%08X: ", afi->attributes);
		if (afi->attributes == 0x01)
			printf("ARM executable");
		if (afi->attributes == 0x08)
			printf("ARM backup");
		printf("\n");
		printf("    Flash mem start: 0x%08lX\n",
		       afi->flash_mem_start);
		printf("    Flash mem end: 0x%08lX\n",
		       afi->flash_mem_end);
		for (j = 0; j < afi->region_count; j++) {
			printf("    region %d\n"
			       "        load address: %08X\n"
			       "        size: %08X\n"
			       "        offset: %08X\n",
			       j,
			       afi->regions[j].load_address,
			       afi->regions[j].size,
			       afi->regions[j].offset);
		}
	}
}

256 257 258 259 260 261 262 263 264 265 266 267 268 269
static int exists(const char * const name)
{
	int i;

	parse_flash();
	for (i = 0; i < num_afs_images; i++) {
		struct afs_image *afi = &afs_images[i];

		if (strcmp(afi->name, name) == 0)
			return CMD_RET_SUCCESS;
	}
	return CMD_RET_FAILURE;
}

270 271
static int do_afs(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
272 273
	int ret = CMD_RET_SUCCESS;

274 275
	if (argc == 1) {
		print_images();
276 277
	} else if (argc == 3 && !strcmp(argv[1], "exists")) {
		ret = exists(argv[2]);
278
	} else if (argc == 3 && !strcmp(argv[1], "load")) {
279
		ret = load_image(argv[2], 0x0);
280 281 282 283
	} else if (argc == 4 && !strcmp(argv[1], "load")) {
		ulong load_addr;

		load_addr = simple_strtoul(argv[3], NULL, 16);
284
		ret = load_image(argv[2], load_addr);
285 286 287 288
	} else {
		return CMD_RET_USAGE;
	}

289
	return ret;
290 291 292 293 294
}

U_BOOT_CMD(afs, 4, 0, do_afs, "show AFS partitions",
	   "no arguments\n"
	   "    - list images in flash\n"
295 296
	   "exists <image>\n"
	   "    - returns 1 if an image exists, else 0\n"
297 298 299 300
	   "load <image>\n"
	   "    - load an image to the location indicated in the header\n"
	   "load <image> 0x<address>\n"
	   "    - load an image to the location specified\n");