[RFC PATCH v3 9/9] tools: spkgimage: add Renesas SPKG format

Ralph Siemsen
2023-02-22T15:46:27Z

Renesas RZ/N1 devices contain BootROM code that loads a custom SPKG
image from QSPI, NAND or USB DFU. Support this format in mkimage tool.

SPKGs can optionally be signed, however creation of signed SPKG is not
currently supported.

Example of how to use it:

tools/mkimage -n board/schneider/rzn1-snarc/spkgimage.cfg \
-T spkgimage -a 0x20040000 -e 0x20040000 \
-d u-boot.bin u-boot.bin.spkg

The config file (spkgimage.cfg in this example) contains additional
parameters such as NAND ECC settings.

Signed-off-by: Ralph Siemsen <ralph.siemsen@linaro.org>
---

Changes in v3:
- provide definition of __packed (as done in kwbimage.h)
- explain why a local copy of roundup() is needed
- document spkgimage in doc/mkimage.1
- add range checks when parsing config file values
- add line numbers for reporting errors in config file
- rename SPKG_HEADER_SIGNATURE to SPKG_HEADER_MARKER
- fix segfault when image is padded by less than 4 bytes
- minor style and typo fixes

Changes in v2:
- rewrote the stand-alone spkg_utility to integrate into mkimage

board/schneider/rzn1-snarc/spkgimage.cfg | 26 ++
boot/image.c | 1 +
doc/mkimage.1 | 45 ++++
include/image.h | 1 +
tools/Makefile | 1 +
tools/spkgimage.c | 330 +++++++++++++++++++++++
tools/spkgimage.h | 45 ++++
7 files changed, 449 insertions(+)
create mode 100644 board/schneider/rzn1-snarc/spkgimage.cfg
create mode 100644 tools/spkgimage.c
create mode 100644 tools/spkgimage.h

diff --git a/board/schneider/rzn1-snarc/spkgimage.cfg b/board/schneider/rzn1-snarc/spkgimage.cfg
new file mode 100644
index 0000000000..b5faf96b00
--- /dev/null
+++ b/board/schneider/rzn1-snarc/spkgimage.cfg
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2022 Schneider Electric
+#
+# SPKG image header, for booting on RZ/N1
+
+# b[35:32] SPKG version
+VERSION 1
+
+# b[42:41] ECC Block size: 0=256 bytes, 1=512 bytes, 2=1024 bytes
+NAND_ECC_BLOCK_SIZE 1
+
+# b[45] NAND enable (boolean)
+NAND_ECC_ENABLE 1
+
+# b[50:48] ECC Scheme: 0=BCH2 1=BCH4 2=BCH8 3=BCH16 4=BCH24 5=BCH32
+NAND_ECC_SCHEME 3
+
+# b[63:56] ECC bytes per block
+NAND_BYTES_PER_ECC_BLOCK 28
+
+# Provide dummy BLp header (boolean)
+ADD_DUMMY_BLP 1
+
+# Pad the image to a multiple of
+PADDING 64K
diff --git a/boot/image.c b/boot/image.c
index 958dbf8534..5c4f9b807d 100644
--- a/boot/image.c
+++ b/boot/image.c
@@ -181,6 +181,7 @@ static const table_entry_t uimage_type[] = {
{ IH_TYPE_SUNXI_EGON, "sunxi_egon", "Allwinner eGON Boot Image" },
{ IH_TYPE_SUNXI_TOC0, "sunxi_toc0", "Allwinner TOC0 Boot Image" },
{ IH_TYPE_FDT_LEGACY, "fdt_legacy", "legacy Image with Flat Device Tree ", },
+ { IH_TYPE_RENESAS_SPKG, "spkgimage", "Renesas SPKG Image" },
{ -1, "", "", },
};

diff --git a/doc/mkimage.1 b/doc/mkimage.1
index d8727ec73c..76c7859bb0 100644
--- a/doc/mkimage.1
+++ b/doc/mkimage.1
@@ -662,6 +662,51 @@ rk3568
.TE
.RE
.
+.SS spkgimage
+The primary configuration file consists of lines containing key/value pairs
+delimited by whitespace. An example follows.
+.PP
+.RS
+.EX
+# Comments and blank lines may be used
+.I key1 value1
+.I key2 value2
+.EE
+.RE
+.P
+The supported
+.I key
+types are as follows.
+.TP
+.B VERSION
+.TQ
+.B NAND_ECC_BLOCK_SIZE
+.TQ
+.B NAND_ECC_ENABLE
+.TQ
+.B NAND_ECC_SCHEME
+.TQ
+.B NAND_BYTES_PER_ECC_BLOCK
+These all take a positive integer value as their argument.
+The value will be copied directly into the respective field
+of the SPKG header structure. For details on these values,
+refer to Section 7.4 of the Renesas RZ/N1 User's Manual.
+.
+.TP
+.B ADD_DUMMY_BLP
+Takes a numeric argument, which is treated as a boolean. Any nonzero
+value will cause a fake BLp security header to be included in the SPKG
+output.
+.
+.TP
+.B PADDING
+Takes a positive integer value, with an optional
+.B K
+or
+.B M
+suffix, indicating KiB / MiB respectively.
+The output SPKG file will be padded to a multiple of this value.
+.
.SS sunxi_egon
The primary configuration is the name to use for the device tree.
.
diff --git a/include/image.h b/include/image.h
index 7717a4c13d..acfbb6a53a 100644
--- a/include/image.h
+++ b/include/image.h
@@ -230,6 +230,7 @@ enum image_type_t {
IH_TYPE_SUNXI_EGON, /* Allwinner eGON Boot Image */
IH_TYPE_SUNXI_TOC0, /* Allwinner TOC0 Boot Image */
IH_TYPE_FDT_LEGACY, /* Binary Flat Device Tree Blob in a Legacy Image */
+ IH_TYPE_RENESAS_SPKG, /* Renesas SPKG image */

IH_TYPE_COUNT, /* Number of image types */
};
diff --git a/tools/Makefile b/tools/Makefile
index e13effbb66..1d7abcb916 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -125,6 +125,7 @@ dumpimage-mkimage-objs := aisimage.o \
stm32image.o \
$(ROCKCHIP_OBS) \
socfpgaimage.o \
+ spkgimage.o \
sunxi_egon.o \
lib/crc16-ccitt.o \
lib/hash-checksum.o \
diff --git a/tools/spkgimage.c b/tools/spkgimage.c
new file mode 100644
index 0000000000..ea8036e114
--- /dev/null
+++ b/tools/spkgimage.c
@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Generate Renesas RZ/N1 BootROM header (SPKG)
+ * (C) Copyright 2022 Schneider Electric
+ *
+ * Based on spkg_utility.c
+ * (C) Copyright 2016 Renesas Electronics Europe Ltd
+ */
+
+#include "imagetool.h"
+#include <limits.h>
+#include <image.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <u-boot/crc.h>
+#include "spkgimage.h"
+
+static struct spkg_file out_buf;
+
+static uint32_t padding;
+
+/* Note: the ordering of the bitfields does not matter */
+static struct config_file {
+ unsigned int version:1;
+ unsigned int ecc_block_size:2;
+ unsigned int ecc_enable:1;
+ unsigned int ecc_scheme:3;
+ unsigned int ecc_bytes:8;
+ unsigned int blp_len;
+ unsigned int padding;
+} conf;
+
+static int check_range(const char *name, int val, int min, int max)
+{
+ if (val < min) {
+ fprintf(stderr, "Warning: param '%s' adjusted to min %d\n",
+ name, min);
+ val = min;
+ }
+
+ if (val > max) {
+ fprintf(stderr, "Warning: param '%s' adjusted to max %d\n",
+ name, max);
+ val = max;
+ }
+
+ return val;
+}
+
+static int spkgimage_parse_config_line(char *line, size_t line_num)
+{
+ char *saveptr;
+ char *delim = "\t ";
+ char *name = strtok_r(line, delim, &saveptr);
+ char *val_str = strtok_r(NULL, delim, &saveptr);
+ int value = atoi(val_str);
+
+ if (!strcmp("VERSION", name)) {
+ conf.version = check_range(name, value, 1, 15);
+ } else if (!strcmp("NAND_ECC_ENABLE", name)) {
+ conf.ecc_enable = check_range(name, value, 0, 1);
+ } else if (!strcmp("NAND_ECC_BLOCK_SIZE", name)) {
+ conf.ecc_block_size = check_range(name, value, 0, 2);
+ } else if (!strcmp("NAND_ECC_SCHEME", name)) {
+ conf.ecc_scheme = check_range(name, value, 0, 7);
+ } else if (!strcmp("NAND_BYTES_PER_ECC_BLOCK", name)) {
+ conf.ecc_bytes = check_range(name, value, 0, 255);
+ } else if (!strcmp("ADD_DUMMY_BLP", name)) {
+ conf.blp_len = value ? SPKG_BLP_SIZE : 0;
+ } else if (!strcmp("PADDING", name)) {
+ if (strrchr(val_str, 'K'))
+ value = value * 1024;
+ else if (strrchr(val_str, 'M'))
+ value = value * 1024 * 1024;
+ conf.padding = check_range(name, value, 1, INT_MAX);
+ } else {
+ fprintf(stderr,
+ "config error: unknown keyword on line %ld\n",
+ line_num);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int spkgimage_parse_config_file(char *filename)
+{
+ FILE *fcfg;
+ char line[256];
+ size_t len;
+ size_t line_num = 0;
+
+ fcfg = fopen(filename, "r");
+ if (!fcfg)
+ return -EINVAL;
+
+ while (fgets(line, sizeof(line), fcfg)) {
+ line_num += 1;
+
+ /* Skip blank lines and comments */
+ if (line[0] == '\n' || line[0] == '#')
+ continue;
+
+ /* Strip the trailing newline */
+ len = strlen(line);
+ if (line[len - 1] == '\n')
+ line[--len] = 0;
+
+ /* Parse the line */
+ if (spkgimage_parse_config_line(line, line_num))
+ return -EINVAL;
+ }
+
+ fclose(fcfg);
+
+ /* Avoid divide-by-zero later on */
+ if (!conf.padding)
+ conf.padding = 1;
+
+ return 0;
+}
+
+static int spkgimage_check_params(struct image_tool_params *params)
+{
+ if (!params->addr) {
+ fprintf(stderr, "Error: Load Address must be set.\n");
+ return -EINVAL;
+ }
+
+ if (!params->imagename || !params->imagename[0]) {
+ fprintf(stderr, "Error: Image name must be set.\n");
+ return -EINVAL;
+ }
+
+ if (!params->datafile) {
+ fprintf(stderr, "Error: Data filename must be set.\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int spkgimage_verify_header(unsigned char *ptr, int size,
+ struct image_tool_params *param)
+{
+ struct spkg_file *file = (struct spkg_file *)ptr;
+ struct spkg_hdr *header = (struct spkg_hdr *)ptr;
+ char marker[4] = SPKG_HEADER_MARKER;
+ uint32_t payload_length;
+ uint32_t crc;
+ uint8_t *crc_buf;
+
+ /* Check the marker bytes */
+ if (memcmp(header->marker, marker, 4)) {
+ fprintf(stderr, "Error: invalid marker bytes\n");
+ return -EINVAL;
+ }
+
+ /* Check the CRC */
+ crc = crc32(0, ptr, SPKG_HEADER_SIZE - SPKG_CRC_SIZE);
+ if (crc != header->crc) {
+ fprintf(stderr, "Error: invalid header CRC=\n");
+ return -EINVAL;
+ }
+
+ /* Check all copies of header are the same */
+ for (int i = 1; i < SPKG_HEADER_COUNT; i++) {
+ if (memcmp(&header[0], &header[i], SPKG_HEADER_SIZE)) {
+ fprintf(stderr, "Error: header %d mismatch\n", i);
+ return -EINVAL;
+ }
+ }
+
+ /* Check the payload CRC */
+ payload_length = le32_to_cpu(header->payload_length) >> 8;
+ crc_buf = file->payload + payload_length - SPKG_CRC_SIZE;
+ crc = crc32(0, file->payload, payload_length - SPKG_CRC_SIZE);
+ if (crc_buf[0] != (crc & 0xff) ||
+ crc_buf[1] != (crc >> 8 & 0xff) ||
+ crc_buf[2] != (crc >> 16 & 0xff) ||
+ crc_buf[3] != (crc >> 24 & 0xff)) {
+ fprintf(stderr, "Error: invalid payload CRC\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void spkgimage_print_header(const void *ptr)
+{
+ const struct spkg_hdr *h = ptr;
+ uint32_t offset = le32_to_cpu(h->execution_offset);
+
+ printf("Image type\t: Renesas SPKG Image\n");
+ printf("Marker\t\t: %c%c%c%c\n",
+ h->marker[0], h->marker[1], h->marker[2], h->marker[3]);
+ printf("Version\t\t: %d\n", h->version);
+ printf("ECC\t\t: ");
+ if (h->ecc & 0x20)
+ printf("Scheme %d, Block size %d, Strength %d\n",
+ h->ecc_scheme, (h->ecc >> 1) & 3, h->ecc_bytes);
+ else
+ printf("Not enabled\n");
+ printf("Payload length\t: %d\n", le32_to_cpu(h->payload_length) >> 8);
+ printf("Load address\t: 0x%08x\n", le32_to_cpu(h->load_address));
+ printf("Execution offset: 0x%08x (%s mode)\n", offset & ~1,
+ offset & 1 ? "THUMB" : "ARM");
+ printf("Header checksum\t: 0x%08x\n", le32_to_cpu(h->crc));
+}
+
+/*
+ * This is the same as the macro version in include/kernel.h.
+ * However we cannot include that header, because for host tools,
+ * it ends up pulling in the host /usr/include/linux/kernel.h,
+ * which lacks the definition of roundup().
+ */
+static inline uint32_t roundup(uint32_t x, uint32_t y)
+{
+ return ((x + y - 1) / y) * y;
+}
+
+static int spkgimage_vrec_header(struct image_tool_params *params,
+ struct image_type_params *tparams)
+{
+ struct stat s;
+
+ /* Parse the config file */
+ if (spkgimage_parse_config_file(params->imagename)) {
+ fprintf(stderr, "Error parsing config file\n");
+ exit(EXIT_FAILURE);
+ }
+
+ /* Get size of input data file */
+ if (stat(params->datafile, &s)) {
+ fprintf(stderr, "Could not stat data file: %s: %s\n",
+ params->datafile, strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+ params->orig_file_size = s.st_size;
+
+ /* Determine size of resulting SPKG file */
+ uint32_t header_len = SPKG_HEADER_SIZE * SPKG_HEADER_COUNT;
+ uint32_t payload_len = conf.blp_len + s.st_size + SPKG_CRC_SIZE;
+ uint32_t total_len = header_len + payload_len;
+
+ /* Round up to next multiple of padding size */
+ uint32_t padded_len = roundup(total_len, conf.padding);
+
+ /* Number of padding bytes to add */
+ padding = padded_len - total_len;
+
+ /* Fixup payload_len to include padding bytes */
+ payload_len += padding;
+
+ /* Prepare the header */
+ struct spkg_hdr header = {
+ .marker = SPKG_HEADER_MARKER,
+ .version = conf.version,
+ .ecc = (conf.ecc_enable << 5) | (conf.ecc_block_size << 1),
+ .ecc_scheme = conf.ecc_scheme,
+ .ecc_bytes = conf.ecc_bytes,
+ .payload_length = cpu_to_le32(payload_len << 8),
+ .load_address = cpu_to_le32(params->addr),
+ .execution_offset = cpu_to_le32(params->ep - params->addr),
+ };
+ header.crc = crc32(0, (uint8_t *)&header,
+ sizeof(header) - SPKG_CRC_SIZE);
+
+ /* Fill the SPKG with the headers */
+ for (int i = 0; i < SPKG_HEADER_COUNT; i++)
+ memcpy(&out_buf.header[i], &header, sizeof(header));
+
+ /* Extra bytes to allocate in the output file */
+ return conf.blp_len + padding + 4;
+}
+
+static void spkgimage_set_header(void *ptr, struct stat *sbuf, int ifd,
+ struct image_tool_params *params)
+{
+ uint8_t *payload = ptr + SPKG_HEADER_SIZE * SPKG_HEADER_COUNT;
+ uint8_t *file_end = payload + conf.blp_len + params->orig_file_size;
+ uint8_t *crc_buf = file_end + padding;
+ uint32_t crc;
+
+ /* Make room for the Dummy BLp header */
+ memmove(payload + conf.blp_len, payload, params->orig_file_size);
+
+ /* Fill the SPKG with the Dummy BLp */
+ memset(payload, 0x88, conf.blp_len);
+
+ /*
+ * mkimage copy_file() pads the input file with zeros.
+ * Replace those zeros with flash friendly one bits.
+ * The original version skipped the first 4 bytes,
+ * probably an oversight, but for consistency we
+ * keep the same behaviour.
+ */
+ if (padding >= 4)
+ memset(file_end + 4, 0xff, padding - 4);
+
+ /* Add Payload CRC */
+ crc = crc32(0, payload, crc_buf - payload);
+ crc_buf[0] = crc;
+ crc_buf[1] = crc >> 8;
+ crc_buf[2] = crc >> 16;
+ crc_buf[3] = crc >> 24;
+}
+
+static int spkgimage_check_image_types(uint8_t type)
+{
+ return 0;
+}
+
+/*
+ * spkgimage type parameter definition
+ */
+U_BOOT_IMAGE_TYPE(
+ spkgimage,
+ "Renesas SPKG Image",
+ sizeof(out_buf),
+ &out_buf,
+ spkgimage_check_params,
+ spkgimage_verify_header,
+ spkgimage_print_header,
+ spkgimage_set_header,
+ NULL,
+ spkgimage_check_image_types,
+ NULL,
+ spkgimage_vrec_header
+);
diff --git a/tools/spkgimage.h b/tools/spkgimage.h
new file mode 100644
index 0000000000..7be127b50f
--- /dev/null
+++ b/tools/spkgimage.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Renesas RZ/N1 Package Table format
+ * (C) 2015-2016 Renesas Electronics Europe, LTD
+ * All rights reserved.
+ *
+ * Converted to mkimage plug-in
+ * (C) Copyright 2022 Schneider Electric
+ */
+
+#ifndef _SPKGIMAGE_H_
+#define _SPKGIMAGE_H_
+
+#ifdef __GNUC__
+#define __packed __attribute((packed))
+#else
+#define __packed
+#endif
+
+#define SPKG_HEADER_MARKER {'R', 'Z', 'N', '1'}
+#define SPKG_HEADER_SIZE 24
+#define SPKG_HEADER_COUNT 8
+#define SPKG_BLP_SIZE 264
+#define SPKG_CRC_SIZE 4
+
+/* SPKG header */
+struct spkg_hdr {
+ uint8_t marker[4]; /* aka magic */
+ uint8_t version;
+ uint8_t ecc;
+ uint8_t ecc_scheme;
+ uint8_t ecc_bytes;
+ uint32_t payload_length; /* only HIGHER 24 bits */
+ uint32_t load_address;
+ uint32_t execution_offset;
+ uint32_t crc; /* of this header */
+} __packed;
+
+struct spkg_file {
+ struct spkg_hdr header[SPKG_HEADER_COUNT];
+ uint8_t payload[0];
+ /* then the CRC */
+} __packed;
+
+#endif
--
2.25.1