u-boot/tools/mtk_image.c
Weijie Gao 3e3332130f tools: mtk_image: add support for nand headers used by newer chips
This patch adds more nand headers in two new types:
1. HSM header, used for spi-nand thru SNFI interface
2. SPIM header, used for spi-nand thru spi-mem interface

The original nand header is renamed to AP header.

Tested-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
2022-09-23 15:09:16 -04:00

772 lines
19 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Generate MediaTek BootROM header for SPL/U-Boot images
*
* Copyright (C) 2018 MediaTek Inc.
* Author: Weijie Gao <weijie.gao@mediatek.com>
*/
#include <time.h>
#include <image.h>
#include <u-boot/crc.h>
#include <u-boot/sha256.h>
#include "imagetool.h"
#include "mtk_image.h"
#include "mtk_nand_headers.h"
static const struct brom_img_type {
const char *name;
enum brlyt_img_type type;
} brom_images[] = {
{
.name = "nand",
.type = BRLYT_TYPE_NAND
}, {
.name = "emmc",
.type = BRLYT_TYPE_EMMC
}, {
.name = "nor",
.type = BRLYT_TYPE_NOR
}, {
.name = "sdmmc",
.type = BRLYT_TYPE_SDMMC
}, {
.name = "snand",
.type = BRLYT_TYPE_SNAND
}, {
.name = "spim-nand",
.type = BRLYT_TYPE_SNAND
}
};
/* Indicates whether we're generating or verifying */
static bool img_gen;
static uint32_t img_size;
/* Image type selected by user */
static enum brlyt_img_type hdr_media;
static uint32_t hdr_offset;
static int use_lk_hdr;
static int use_mt7621_hdr;
static bool is_arm64_image;
/* LK image name */
static char lk_name[32] = "U-Boot";
/* CRC32 normal table required by MT7621 image */
static uint32_t crc32tbl[256];
/* NAND header selected by user */
static const struct nand_header_type *hdr_nand;
static uint32_t hdr_nand_size;
/* GFH header + 2 * 4KB pages of NAND */
static char hdr_tmp[sizeof(struct gfh_header) + 0x2000];
static uint32_t crc32_normal_cal(uint32_t crc, const void *data, size_t length,
const uint32_t *crc32c_table)
{
const uint8_t *p = data;
while (length--)
crc = crc32c_table[(uint8_t)((crc >> 24) ^ *p++)] ^ (crc << 8);
return crc;
}
static void crc32_normal_init(uint32_t *crc32c_table, uint32_t poly)
{
uint32_t v, i, j;
for (i = 0; i < 256; i++) {
v = i << 24;
for (j = 0; j < 8; j++)
v = (v << 1) ^ ((v & (1 << 31)) ? poly : 0);
crc32c_table[i] = v;
}
}
static int mtk_image_check_image_types(uint8_t type)
{
if (type == IH_TYPE_MTKIMAGE)
return EXIT_SUCCESS;
else
return EXIT_FAILURE;
}
static int mtk_brom_parse_imagename(const char *imagename)
{
#define is_blank_char(c) \
((c) == '\t' || (c) == '\n' || (c) == '\r' || (c) == ' ')
char *buf = strdup(imagename), *key, *val, *end, *next;
int i;
/* User passed arguments from image name */
static const char *media = "";
static const char *hdr_offs = "";
static const char *nandinfo = "";
static const char *lk = "";
static const char *mt7621 = "";
static const char *arm64_param = "";
key = buf;
while (key) {
next = strchr(key, ';');
if (next)
*next = 0;
val = strchr(key, '=');
if (val) {
*val++ = 0;
/* Trim key */
while (is_blank_char(*key))
key++;
end = key + strlen(key) - 1;
while ((end >= key) && is_blank_char(*end))
end--;
end++;
if (is_blank_char(*end))
*end = 0;
/* Trim value */
while (is_blank_char(*val))
val++;
end = val + strlen(val) - 1;
while ((end >= val) && is_blank_char(*end))
end--;
end++;
if (is_blank_char(*end))
*end = 0;
/* record user passed arguments */
if (!strcmp(key, "media"))
media = val;
if (!strcmp(key, "hdroffset"))
hdr_offs = val;
if (!strcmp(key, "nandinfo"))
nandinfo = val;
if (!strcmp(key, "lk"))
lk = val;
if (!strcmp(key, "mt7621"))
mt7621 = val;
if (!strcmp(key, "lkname"))
snprintf(lk_name, sizeof(lk_name), "%s", val);
if (!strcmp(key, "arm64"))
arm64_param = val;
}
if (next)
key = next + 1;
else
break;
}
/* if user specified LK image header, skip following checks */
if (lk && lk[0] == '1') {
use_lk_hdr = 1;
free(buf);
return 0;
}
/* if user specified MT7621 image header, skip following checks */
if (mt7621 && mt7621[0] == '1') {
use_mt7621_hdr = 1;
free(buf);
return 0;
}
/* parse media type */
for (i = 0; i < ARRAY_SIZE(brom_images); i++) {
if (!strcmp(brom_images[i].name, media)) {
hdr_media = brom_images[i].type;
break;
}
}
/* parse nand header type */
hdr_nand = mtk_nand_header_find(nandinfo);
/* parse device header offset */
if (hdr_offs && hdr_offs[0])
hdr_offset = strtoul(hdr_offs, NULL, 0);
if (arm64_param && arm64_param[0] == '1')
is_arm64_image = true;
free(buf);
if (hdr_media == BRLYT_TYPE_INVALID) {
fprintf(stderr, "Error: media type is invalid or missing.\n");
fprintf(stderr, " Please specify -n \"media=<type>\"\n");
return -EINVAL;
}
if ((hdr_media == BRLYT_TYPE_NAND || hdr_media == BRLYT_TYPE_SNAND) &&
!hdr_nand) {
fprintf(stderr, "Error: nand info is invalid or missing.\n");
fprintf(stderr, " Please specify -n \"media=%s;"
"nandinfo=<info>\"\n", media);
return -EINVAL;
}
if (hdr_media == BRLYT_TYPE_NAND || hdr_media == BRLYT_TYPE_SNAND)
hdr_nand_size = mtk_nand_header_size(hdr_nand);
return 0;
}
static int mtk_image_check_params(struct image_tool_params *params)
{
if (!params->addr) {
fprintf(stderr, "Error: Load Address must be set.\n");
return -EINVAL;
}
if (!params->imagename) {
fprintf(stderr, "Error: Image Name must be set.\n");
return -EINVAL;
}
return mtk_brom_parse_imagename(params->imagename);
}
static int mtk_image_vrec_header(struct image_tool_params *params,
struct image_type_params *tparams)
{
if (use_lk_hdr) {
tparams->header_size = sizeof(union lk_hdr);
tparams->hdr = &hdr_tmp;
memset(&hdr_tmp, 0xff, tparams->header_size);
return 0;
}
if (use_mt7621_hdr) {
tparams->header_size = image_get_header_size();
tparams->hdr = &hdr_tmp;
memset(&hdr_tmp, 0, tparams->header_size);
return 0;
}
if (hdr_media == BRLYT_TYPE_NAND || hdr_media == BRLYT_TYPE_SNAND)
tparams->header_size = hdr_nand_size;
else
tparams->header_size = sizeof(struct gen_device_header);
tparams->header_size += sizeof(struct gfh_header);
tparams->hdr = &hdr_tmp;
memset(&hdr_tmp, 0xff, tparams->header_size);
return SHA256_SUM_LEN;
}
static int mtk_image_verify_gfh(struct gfh_header *gfh, uint32_t type, int print)
{
if (strcmp(gfh->file_info.name, GFH_FILE_INFO_NAME))
return -1;
if (le32_to_cpu(gfh->file_info.flash_type) != type)
return -1;
if (print)
printf("Load Address: %08x\n",
le32_to_cpu(gfh->file_info.load_addr) +
le32_to_cpu(gfh->file_info.jump_offset));
if (print)
printf("Architecture: %s\n", is_arm64_image ? "ARM64" : "ARM");
return 0;
}
static int mtk_image_verify_gen_header(const uint8_t *ptr, int print)
{
union gen_boot_header *gbh = (union gen_boot_header *)ptr;
uint32_t gfh_offset, total_size, devh_size;
struct brom_layout_header *bh;
struct gfh_header *gfh;
const char *bootmedia;
if (!strcmp(gbh->name, SF_BOOT_NAME))
bootmedia = "Serial NOR";
else if (!strcmp(gbh->name, EMMC_BOOT_NAME))
bootmedia = "eMMC";
else if (!strcmp(gbh->name, SDMMC_BOOT_NAME))
bootmedia = "SD/MMC";
else
return -1;
if (print)
printf("Boot Media: %s\n", bootmedia);
if (le32_to_cpu(gbh->version) != 1 ||
le32_to_cpu(gbh->size) != sizeof(union gen_boot_header))
return -1;
bh = (struct brom_layout_header *)(ptr + le32_to_cpu(gbh->size));
if (strcmp(bh->name, BRLYT_NAME))
return -1;
if (le32_to_cpu(bh->magic) != BRLYT_MAGIC ||
(le32_to_cpu(bh->type) != BRLYT_TYPE_NOR &&
le32_to_cpu(bh->type) != BRLYT_TYPE_EMMC &&
le32_to_cpu(bh->type) != BRLYT_TYPE_SDMMC))
return -1;
devh_size = sizeof(struct gen_device_header);
if (img_gen) {
gfh_offset = devh_size;
} else {
gfh_offset = le32_to_cpu(bh->header_size);
if (gfh_offset + sizeof(struct gfh_header) > img_size) {
/*
* This may happen if the hdr_offset used to generate
* this image is not zero.
* Since device header size is not fixed, we can't
* cover all possible cases.
* Assuming the image is valid only if the real
* device header size equals to devh_size.
*/
total_size = le32_to_cpu(bh->total_size);
if (total_size - gfh_offset > img_size - devh_size)
return -1;
gfh_offset = devh_size;
}
}
gfh = (struct gfh_header *)(ptr + gfh_offset);
return mtk_image_verify_gfh(gfh, GFH_FLASH_TYPE_GEN, print);
}
static int mtk_image_verify_nand_header(const uint8_t *ptr, int print)
{
struct brom_layout_header *bh;
struct nand_header_info info;
struct gfh_header *gfh;
const char *bootmedia;
int ret;
ret = mtk_nand_header_info(ptr, &info);
if (ret < 0)
return ret;
if (!ret) {
bh = (struct brom_layout_header *)(ptr + info.page_size);
if (strcmp(bh->name, BRLYT_NAME))
return -1;
if (le32_to_cpu(bh->magic) != BRLYT_MAGIC)
return -1;
if (le32_to_cpu(bh->type) == BRLYT_TYPE_NAND)
bootmedia = "Parallel NAND";
else if (le32_to_cpu(bh->type) == BRLYT_TYPE_SNAND)
bootmedia = "Serial NAND (SNFI/AP)";
else
return -1;
} else {
if (info.snfi)
bootmedia = "Serial NAND (SNFI/HSM)";
else
bootmedia = "Serial NAND (SPIM)";
}
if (print) {
printf("Boot Media: %s\n", bootmedia);
if (info.page_size >= 1024)
printf("Page Size: %dKB\n", info.page_size >> 10);
else
printf("Page Size: %dB\n", info.page_size);
printf("Spare Size: %dB\n", info.spare_size);
}
gfh = (struct gfh_header *)(ptr + info.gfh_offset);
return mtk_image_verify_gfh(gfh, GFH_FLASH_TYPE_NAND, print);
}
static uint32_t crc32be_cal(const void *data, size_t length)
{
uint32_t crc = 0;
uint8_t c;
if (crc32tbl[1] != MT7621_IH_CRC_POLYNOMIAL)
crc32_normal_init(crc32tbl, MT7621_IH_CRC_POLYNOMIAL);
crc = crc32_normal_cal(crc, data, length, crc32tbl);
for (; length; length >>= 8) {
c = length & 0xff;
crc = crc32_normal_cal(crc, &c, 1, crc32tbl);
}
return ~crc;
}
static int mtk_image_verify_mt7621_header(const uint8_t *ptr, int print)
{
const image_header_t *hdr = (const image_header_t *)ptr;
struct mt7621_nand_header *nhdr;
uint32_t spl_size, crcval;
image_header_t header;
int ret;
spl_size = image_get_size(hdr);
if (spl_size > img_size) {
if (print)
printf("Incomplete SPL image\n");
return -1;
}
ret = image_check_hcrc(hdr);
if (!ret) {
if (print)
printf("Bad header CRC\n");
return -1;
}
ret = image_check_dcrc(hdr);
if (!ret) {
if (print)
printf("Bad data CRC\n");
return -1;
}
/* Copy header so we can blank CRC field for re-calculation */
memmove(&header, hdr, image_get_header_size());
image_set_hcrc(&header, 0);
nhdr = (struct mt7621_nand_header *)header.ih_name;
crcval = be32_to_cpu(nhdr->crc);
nhdr->crc = 0;
if (crcval != crc32be_cal(&header, image_get_header_size())) {
if (print)
printf("Bad NAND header CRC\n");
return -1;
}
if (print) {
printf("Load Address: %08x\n", image_get_load(hdr));
printf("Image Name: %.*s\n", MT7621_IH_NMLEN,
image_get_name(hdr));
if (IMAGE_ENABLE_TIMESTAMP) {
printf("Created: ");
genimg_print_time((time_t)image_get_time(hdr));
}
printf("Data Size: ");
genimg_print_size(image_get_data_size(hdr));
}
return 0;
}
static int mtk_image_verify_header(unsigned char *ptr, int image_size,
struct image_tool_params *params)
{
image_header_t *hdr = (image_header_t *)ptr;
union lk_hdr *lk = (union lk_hdr *)ptr;
/* nothing to verify for LK image header */
if (le32_to_cpu(lk->magic) == LK_PART_MAGIC)
return 0;
img_size = image_size;
if (image_get_magic(hdr) == IH_MAGIC)
return mtk_image_verify_mt7621_header(ptr, 0);
if (is_mtk_nand_header(ptr))
return mtk_image_verify_nand_header(ptr, 0);
else
return mtk_image_verify_gen_header(ptr, 0);
return -1;
}
static void mtk_image_print_header(const void *ptr)
{
image_header_t *hdr = (image_header_t *)ptr;
union lk_hdr *lk = (union lk_hdr *)ptr;
if (le32_to_cpu(lk->magic) == LK_PART_MAGIC) {
printf("Image Type: MediaTek LK Image\n");
printf("Load Address: %08x\n", le32_to_cpu(lk->loadaddr));
return;
}
printf("Image Type: MediaTek BootROM Loadable Image\n");
if (image_get_magic(hdr) == IH_MAGIC) {
mtk_image_verify_mt7621_header(ptr, 1);
return;
}
if (is_mtk_nand_header(ptr))
mtk_image_verify_nand_header(ptr, 1);
else
mtk_image_verify_gen_header(ptr, 1);
}
static void put_brom_layout_header(struct brom_layout_header *hdr, int type)
{
strncpy(hdr->name, BRLYT_NAME, sizeof(hdr->name));
hdr->version = cpu_to_le32(1);
hdr->magic = cpu_to_le32(BRLYT_MAGIC);
hdr->type = cpu_to_le32(type);
}
static void put_ghf_common_header(struct gfh_common_header *gfh, int size,
int type, int ver)
{
memcpy(gfh->magic, GFH_HEADER_MAGIC, sizeof(gfh->magic));
gfh->version = ver;
gfh->size = cpu_to_le16(size);
gfh->type = cpu_to_le16(type);
}
static void put_ghf_header(struct gfh_header *gfh, int file_size,
int dev_hdr_size, int load_addr, int flash_type)
{
uint32_t cfg_bits;
memset(gfh, 0, sizeof(struct gfh_header));
/* GFH_FILE_INFO header */
put_ghf_common_header(&gfh->file_info.gfh, sizeof(gfh->file_info),
GFH_TYPE_FILE_INFO, 1);
strncpy(gfh->file_info.name, GFH_FILE_INFO_NAME,
sizeof(gfh->file_info.name));
gfh->file_info.unused = cpu_to_le32(1);
gfh->file_info.file_type = cpu_to_le16(1);
gfh->file_info.flash_type = flash_type;
gfh->file_info.sig_type = GFH_SIG_TYPE_SHA256;
gfh->file_info.load_addr = cpu_to_le32(load_addr - sizeof(*gfh));
gfh->file_info.total_size = cpu_to_le32(file_size - dev_hdr_size);
gfh->file_info.max_size = cpu_to_le32(file_size);
gfh->file_info.hdr_size = sizeof(*gfh);
gfh->file_info.sig_size = SHA256_SUM_LEN;
gfh->file_info.jump_offset = sizeof(*gfh);
gfh->file_info.processed = cpu_to_le32(1);
/* GFH_BL_INFO header */
put_ghf_common_header(&gfh->bl_info.gfh, sizeof(gfh->bl_info),
GFH_TYPE_BL_INFO, 1);
gfh->bl_info.attr = cpu_to_le32(1);
/* GFH_BROM_CFG header */
put_ghf_common_header(&gfh->brom_cfg.gfh, sizeof(gfh->brom_cfg),
GFH_TYPE_BROM_CFG, 3);
cfg_bits = GFH_BROM_CFG_USBDL_AUTO_DETECT_DIS |
GFH_BROM_CFG_USBDL_BY_KCOL0_TIMEOUT_EN |
GFH_BROM_CFG_USBDL_BY_FLAG_TIMEOUT_EN;
gfh->brom_cfg.usbdl_by_kcol0_timeout_ms = cpu_to_le32(5000);
if (is_arm64_image) {
gfh->brom_cfg.jump_bl_arm64 = GFH_BROM_CFG_JUMP_BL_ARM64;
cfg_bits |= GFH_BROM_CFG_JUMP_BL_ARM64_EN;
}
gfh->brom_cfg.cfg_bits = cpu_to_le32(cfg_bits);
/* GFH_BL_SEC_KEY header */
put_ghf_common_header(&gfh->bl_sec_key.gfh, sizeof(gfh->bl_sec_key),
GFH_TYPE_BL_SEC_KEY, 1);
/* GFH_ANTI_CLONE header */
put_ghf_common_header(&gfh->anti_clone.gfh, sizeof(gfh->anti_clone),
GFH_TYPE_ANTI_CLONE, 1);
gfh->anti_clone.ac_offset = cpu_to_le32(0x10);
gfh->anti_clone.ac_len = cpu_to_le32(0x80);
/* GFH_BROM_SEC_CFG header */
put_ghf_common_header(&gfh->brom_sec_cfg.gfh,
sizeof(gfh->brom_sec_cfg),
GFH_TYPE_BROM_SEC_CFG, 1);
gfh->brom_sec_cfg.cfg_bits =
cpu_to_le32(BROM_SEC_CFG_JTAG_EN | BROM_SEC_CFG_UART_EN);
}
static void put_hash(uint8_t *buff, int size)
{
sha256_context ctx;
sha256_starts(&ctx);
sha256_update(&ctx, buff, size);
sha256_finish(&ctx, buff + size);
}
static void mtk_image_set_gen_header(void *ptr, off_t filesize,
uint32_t loadaddr)
{
struct gen_device_header *hdr = (struct gen_device_header *)ptr;
struct gfh_header *gfh;
const char *bootname = NULL;
if (hdr_media == BRLYT_TYPE_NOR)
bootname = SF_BOOT_NAME;
else if (hdr_media == BRLYT_TYPE_EMMC)
bootname = EMMC_BOOT_NAME;
else if (hdr_media == BRLYT_TYPE_SDMMC)
bootname = SDMMC_BOOT_NAME;
/* Generic device header */
snprintf(hdr->boot.name, sizeof(hdr->boot.name), "%s", bootname);
hdr->boot.version = cpu_to_le32(1);
hdr->boot.size = cpu_to_le32(sizeof(hdr->boot));
/* BRLYT header */
put_brom_layout_header(&hdr->brlyt, hdr_media);
hdr->brlyt.header_size = cpu_to_le32(hdr_offset + sizeof(*hdr));
hdr->brlyt.total_size = cpu_to_le32(hdr_offset + filesize);
hdr->brlyt.header_size_2 = hdr->brlyt.header_size;
hdr->brlyt.total_size_2 = hdr->brlyt.total_size;
/* GFH header */
gfh = (struct gfh_header *)(ptr + sizeof(struct gen_device_header));
put_ghf_header(gfh, filesize, sizeof(struct gen_device_header),
loadaddr, GFH_FLASH_TYPE_GEN);
/* Generate SHA256 hash */
put_hash((uint8_t *)gfh,
filesize - sizeof(struct gen_device_header) - SHA256_SUM_LEN);
}
static void mtk_image_set_nand_header(void *ptr, off_t filesize,
uint32_t loadaddr)
{
struct brom_layout_header *brlyt;
struct gfh_header *gfh;
uint32_t payload_pages, nand_page_size;
/* NAND header */
nand_page_size = mtk_nand_header_put(hdr_nand, ptr);
if (nand_page_size) {
/* BRLYT header */
payload_pages = (filesize + nand_page_size - 1) /
nand_page_size;
brlyt = (struct brom_layout_header *)(ptr + nand_page_size);
put_brom_layout_header(brlyt, hdr_media);
brlyt->header_size = cpu_to_le32(2);
brlyt->total_size = cpu_to_le32(payload_pages);
brlyt->header_size_2 = brlyt->header_size;
brlyt->total_size_2 = brlyt->total_size;
brlyt->unused = cpu_to_le32(1);
}
/* GFH header */
gfh = (struct gfh_header *)(ptr + hdr_nand_size);
put_ghf_header(gfh, filesize, hdr_nand_size, loadaddr,
GFH_FLASH_TYPE_NAND);
/* Generate SHA256 hash */
put_hash((uint8_t *)gfh, filesize - hdr_nand_size - SHA256_SUM_LEN);
}
static void mtk_image_set_mt7621_header(void *ptr, off_t filesize,
uint32_t loadaddr)
{
image_header_t *hdr = (image_header_t *)ptr;
struct mt7621_stage1_header *shdr;
struct mt7621_nand_header *nhdr;
uint32_t datasize, crcval;
datasize = filesize - image_get_header_size();
nhdr = (struct mt7621_nand_header *)hdr->ih_name;
shdr = (struct mt7621_stage1_header *)(ptr + image_get_header_size());
shdr->ep = cpu_to_be32(loadaddr);
shdr->stage_size = cpu_to_be32(datasize);
image_set_magic(hdr, IH_MAGIC);
image_set_time(hdr, time(NULL));
image_set_size(hdr, datasize);
image_set_load(hdr, loadaddr);
image_set_ep(hdr, loadaddr);
image_set_os(hdr, IH_OS_U_BOOT);
image_set_arch(hdr, IH_ARCH_MIPS);
image_set_type(hdr, IH_TYPE_STANDALONE);
image_set_comp(hdr, IH_COMP_NONE);
crcval = crc32(0, (uint8_t *)shdr, datasize);
image_set_dcrc(hdr, crcval);
strncpy(nhdr->ih_name, "MT7621 NAND", MT7621_IH_NMLEN);
nhdr->ih_stage_offset = cpu_to_be32(image_get_header_size());
crcval = crc32be_cal(hdr, image_get_header_size());
nhdr->crc = cpu_to_be32(crcval);
crcval = crc32(0, (uint8_t *)hdr, image_get_header_size());
image_set_hcrc(hdr, crcval);
}
static void mtk_image_set_header(void *ptr, struct stat *sbuf, int ifd,
struct image_tool_params *params)
{
union lk_hdr *lk = (union lk_hdr *)ptr;
if (use_lk_hdr) {
lk->magic = cpu_to_le32(LK_PART_MAGIC);
lk->size = cpu_to_le32(sbuf->st_size - sizeof(union lk_hdr));
lk->loadaddr = cpu_to_le32(params->addr);
lk->mode = 0xffffffff; /* must be non-zero */
memset(lk->name, 0, sizeof(lk->name));
strncpy(lk->name, lk_name, sizeof(lk->name));
return;
}
img_gen = true;
img_size = sbuf->st_size;
if (use_mt7621_hdr) {
mtk_image_set_mt7621_header(ptr, sbuf->st_size, params->addr);
return;
}
if (hdr_media == BRLYT_TYPE_NAND || hdr_media == BRLYT_TYPE_SNAND)
mtk_image_set_nand_header(ptr, sbuf->st_size, params->addr);
else
mtk_image_set_gen_header(ptr, sbuf->st_size, params->addr);
}
U_BOOT_IMAGE_TYPE(
mtk_image,
"MediaTek BootROM Loadable Image support",
0,
NULL,
mtk_image_check_params,
mtk_image_verify_header,
mtk_image_print_header,
mtk_image_set_header,
NULL,
mtk_image_check_image_types,
NULL,
mtk_image_vrec_header
);