The new atmelimage converts a machine code BLOB to bootable ROM image. Atmel ROM has no sophisticated image format, it only checks the first 7 ARM vectors. The vectors can contain valid B or LDR opcodes, the 6'th vector contains the image size to load. The image size must not exceed 64 KiB.
Signed-off-by: Andreas Bießmann andreas.devel@googlemail.com ---
common/image.c | 1 + include/image.h | 1 + tools/Makefile | 1 + tools/atmelimage.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/imagetool.c | 2 ++ tools/imagetool.h | 1 + 6 files changed, 94 insertions(+) create mode 100644 tools/atmelimage.c
diff --git a/common/image.c b/common/image.c index 9c6bec5..86bcd10 100644 --- a/common/image.c +++ b/common/image.c @@ -138,6 +138,7 @@ static const table_entry_t uimage_type[] = { { IH_TYPE_STANDALONE, "standalone", "Standalone Program", }, { IH_TYPE_UBLIMAGE, "ublimage", "Davinci UBL image",}, { IH_TYPE_MXSIMAGE, "mxsimage", "Freescale MXS Boot Image",}, + { IH_TYPE_ATMELIMAGE, "atmelimage", "ATMEL ROM-Boot Image",}, { -1, "", "", }, };
diff --git a/include/image.h b/include/image.h index 2508d7d..542c90d 100644 --- a/include/image.h +++ b/include/image.h @@ -224,6 +224,7 @@ struct lmb; #define IH_TYPE_KERNEL_NOLOAD 14 /* OS Kernel Image, can run from any load address */ #define IH_TYPE_PBLIMAGE 15 /* Freescale PBL Boot Image */ #define IH_TYPE_MXSIMAGE 16 /* Freescale MXSBoot Image */ +#define IH_TYPE_ATMELIMAGE 17 /* ATMEL ROM bootable Image */
/* * Compression Types diff --git a/tools/Makefile b/tools/Makefile index c34df4f..003727e 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -69,6 +69,7 @@ RSA_OBJS-$(CONFIG_FIT_SIGNATURE) := rsa-sign.o rsa-verify.o rsa-checksum.o
# common objs for dumpimage and mkimage dumpimage-mkimage-objs := aisimage.o \ + atmelimage.o \ $(FIT_SIG_OBJS-y) \ crc32.o \ default_image.o \ diff --git a/tools/atmelimage.c b/tools/atmelimage.c new file mode 100644 index 0000000..21436d3 --- /dev/null +++ b/tools/atmelimage.c @@ -0,0 +1,88 @@ +/* + * (C) Copyright 2014 + * Andreas Bießmann andreas.devel@googlemail.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include "imagetool.h" +#include <image.h> + +static int atmel_check_image_type(uint8_t type) +{ + if (type == IH_TYPE_ATMELIMAGE) + return EXIT_SUCCESS; + else + return EXIT_FAILURE; +} + +static int atmel_verify_header(unsigned char *ptr, int image_size, + struct image_tool_params *params) +{ + uint32_t *ints = (uint32_t *)ptr; + size_t pos; + + /* The size must not exceed 64 Kbytes */ + if (image_size >= 64 * 1024) + return 1; + + for (pos = 0; pos < 7; pos++) { + /* + * all vectors except the 6'th one must contain valid + * LDR or B Opcode + */ + if (pos == 5) + /* 6'th vector has image size set, check later */ + continue; + if ((ints[pos] & 0xff000000) == 0xea000000) + /* valid B Opcode */ + continue; + if ((ints[pos] & 0xfffff000) == 0xe59ff000) + /* valid LDR (I=0, P=1, U=1, B=0, W=0, L=1) */ + continue; + /* ouch, one of the checks has missed ... */ + return 1; + } + return ints[5] != image_size; +} + +static void atmel_print_header(const void *ptr) +{ + printf("Image Type: ATMEL ROM-Boot Image\n"); +} + +static void atmel_set_header(void *ptr, struct stat *sbuf, int ifd, + struct image_tool_params *params) +{ + /* just save the image size into 6'th interrupt vector */ + uint32_t *ints = (uint32_t *)ptr; + + /* The size must not exceed 64 Kbytes */ + if (sbuf->st_size < 64 * 1024) + ints[5] = sbuf->st_size; +} + +static int atmel_check_params(struct image_tool_params *params) +{ + return !(!params->eflag && + !params->fflag && + !params->xflag && + ((params->dflag && !params->lflag) || + (params->lflag && !params->dflag))); +} + +static struct image_type_params atmelimage_params = { + .name = "ATMEL ROM-Boot Image support", + .header_size = 0, + .hdr = NULL, + .check_image_type = atmel_check_image_type, + .verify_header = atmel_verify_header, + .print_header = atmel_print_header, + .set_header = atmel_set_header, + .check_params = atmel_check_params, +}; + +void init_atmel_image_type(void) +{ + register_image_type(&atmelimage_params); +} diff --git a/tools/imagetool.c b/tools/imagetool.c index 29d2189..27072c8 100644 --- a/tools/imagetool.c +++ b/tools/imagetool.c @@ -27,6 +27,8 @@ void register_image_tool(imagetool_register_t image_register) */ register_func = image_register;
+ /* Init ATMEL ROM Boot Image generation/list support */ + init_atmel_image_type(); /* Init Freescale PBL Boot image generation/list support */ init_pbl_image_type(); /* Init Kirkwood Boot image generation/list support */ diff --git a/tools/imagetool.h b/tools/imagetool.h index c2c9aea..558f332 100644 --- a/tools/imagetool.h +++ b/tools/imagetool.h @@ -159,6 +159,7 @@ void register_image_type(struct image_type_params *tparams); * Supported image types init functions */ void init_default_image_type(void); +void init_atmel_image_type(void); void init_pbl_image_type(void); void init_ais_image_type(void); void init_kwb_image_type(void);