stm32image.c
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// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
*/
#include <image.h>
#include "imagetool.h"
/* magic ='S' 'T' 'M' 0x32 */
#define HEADER_MAGIC be32_to_cpu(0x53544D32)
#define VER_MAJOR_IDX 2
#define VER_MINOR_IDX 1
#define VER_VARIANT_IDX 0
#define HEADER_VERSION_V1 0x1
/* default option : bit0 => no signature */
#define HEADER_DEFAULT_OPTION (cpu_to_le32(0x00000001))
/* default binary type for U-Boot */
#define HEADER_TYPE_UBOOT (cpu_to_le32(0x00000000))
struct stm32_header {
uint32_t magic_number;
uint32_t image_signature[64 / 4];
uint32_t image_checksum;
uint8_t header_version[4];
uint32_t image_length;
uint32_t image_entry_point;
uint32_t reserved1;
uint32_t load_address;
uint32_t reserved2;
uint32_t version_number;
uint32_t option_flags;
uint32_t ecdsa_algorithm;
uint32_t ecdsa_public_key[64 / 4];
uint32_t padding[83 / 4];
uint32_t binary_type;
};
static struct stm32_header stm32image_header;
static void stm32image_default_header(struct stm32_header *ptr)
{
if (!ptr)
return;
ptr->magic_number = HEADER_MAGIC;
ptr->header_version[VER_MAJOR_IDX] = HEADER_VERSION_V1;
ptr->option_flags = HEADER_DEFAULT_OPTION;
ptr->ecdsa_algorithm = cpu_to_le32(1);
ptr->binary_type = HEADER_TYPE_UBOOT;
}
static uint32_t stm32image_checksum(void *start, uint32_t len)
{
uint32_t csum = 0;
uint32_t hdr_len = sizeof(struct stm32_header);
uint8_t *p;
if (len < hdr_len)
return 0;
p = start + hdr_len;
len -= hdr_len;
while (len > 0) {
csum += *p;
p++;
len--;
}
return csum;
}
static int stm32image_check_image_types(uint8_t type)
{
if (type == IH_TYPE_STM32IMAGE)
return EXIT_SUCCESS;
return EXIT_FAILURE;
}
static int stm32image_verify_header(unsigned char *ptr, int image_size,
struct image_tool_params *params)
{
struct stm32_header *stm32hdr = (struct stm32_header *)ptr;
int i;
if (image_size < sizeof(struct stm32_header))
return -1;
if (stm32hdr->magic_number != HEADER_MAGIC)
return -1;
if (stm32hdr->header_version[VER_MAJOR_IDX] != HEADER_VERSION_V1)
return -1;
if (stm32hdr->reserved1 || stm32hdr->reserved2)
return -1;
for (i = 0; i < (sizeof(stm32hdr->padding) / 4); i++) {
if (stm32hdr->padding[i] != 0)
return -1;
}
return 0;
}
static void stm32image_print_header(const void *ptr)
{
struct stm32_header *stm32hdr = (struct stm32_header *)ptr;
printf("Image Type : STMicroelectronics STM32 V%d.%d\n",
stm32hdr->header_version[VER_MAJOR_IDX],
stm32hdr->header_version[VER_MINOR_IDX]);
printf("Image Size : %lu bytes\n",
(unsigned long)le32_to_cpu(stm32hdr->image_length));
printf("Image Load : 0x%08x\n",
le32_to_cpu(stm32hdr->load_address));
printf("Entry Point : 0x%08x\n",
le32_to_cpu(stm32hdr->image_entry_point));
printf("Checksum : 0x%08x\n",
le32_to_cpu(stm32hdr->image_checksum));
printf("Option : 0x%08x\n",
le32_to_cpu(stm32hdr->option_flags));
printf("BinaryType : 0x%08x\n",
le32_to_cpu(stm32hdr->binary_type));
}
static void stm32image_set_header(void *ptr, struct stat *sbuf, int ifd,
struct image_tool_params *params)
{
struct stm32_header *stm32hdr = (struct stm32_header *)ptr;
stm32image_default_header(stm32hdr);
stm32hdr->load_address = cpu_to_le32(params->addr);
stm32hdr->image_entry_point = cpu_to_le32(params->ep);
stm32hdr->image_length = cpu_to_le32((uint32_t)sbuf->st_size -
sizeof(struct stm32_header));
stm32hdr->image_checksum =
cpu_to_le32(stm32image_checksum(ptr, sbuf->st_size));
}
/*
* stm32image parameters
*/
U_BOOT_IMAGE_TYPE(
stm32image,
"STMicroelectronics STM32MP Image support",
sizeof(struct stm32_header),
(void *)&stm32image_header,
NULL,
stm32image_verify_header,
stm32image_print_header,
stm32image_set_header,
NULL,
stm32image_check_image_types,
NULL,
NULL
);