[PATCH v3 2/3] tools: mkimage: Add Allwinner eGON support
Samuel Holland
samuel at sholland.org
Thu Nov 19 05:05:18 CET 2020
On 11/18/20 11:32 AM, Andre Przywara wrote:
> So far we used the separate mksunxiboot tool for generating a bootable
> image for Allwinner SPLs, probably just for historical reasons.
>
> Use the mkimage framework to generate a so called eGON image the
> Allwinner BROM expects.
> The new image type is called "sunxi_egon", to differentiate it
> from the (still to be implemented) secure boot TOC0 image.
>
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> ---
> common/image.c | 1 +
> include/image.h | 1 +
> include/sunxi_image.h | 1 +
> tools/Makefile | 1 +
> tools/sunxi_egon.c | 136 ++++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 140 insertions(+)
> create mode 100644 tools/sunxi_egon.c
>
> diff --git a/common/image.c b/common/image.c
> index 451fc689a89..6923dac7c07 100644
> --- a/common/image.c
> +++ b/common/image.c
> @@ -189,6 +189,7 @@ static const table_entry_t uimage_type[] = {
> { IH_TYPE_STM32IMAGE, "stm32image", "STMicroelectronics STM32 Image" },
> { IH_TYPE_MTKIMAGE, "mtk_image", "MediaTek BootROM loadable Image" },
> { IH_TYPE_COPRO, "copro", "Coprocessor Image"},
> + { IH_TYPE_SUNXI_EGON, "sunxi_egon", "Allwinner eGON Boot Image" },
> { -1, "", "", },
> };
>
> diff --git a/include/image.h b/include/image.h
> index 00bc03bebec..89bfca2155a 100644
> --- a/include/image.h
> +++ b/include/image.h
> @@ -308,6 +308,7 @@ enum {
> IH_TYPE_IMX8MIMAGE, /* Freescale IMX8MBoot Image */
> IH_TYPE_IMX8IMAGE, /* Freescale IMX8Boot Image */
> IH_TYPE_COPRO, /* Coprocessor Image for remoteproc*/
> + IH_TYPE_SUNXI_EGON, /* Allwinner eGON Boot Image */
>
> IH_TYPE_COUNT, /* Number of image types */
> };
> diff --git a/include/sunxi_image.h b/include/sunxi_image.h
> index d0d1290eb72..5b2055c0af3 100644
> --- a/include/sunxi_image.h
> +++ b/include/sunxi_image.h
> @@ -13,6 +13,7 @@
> #define SUNXI_IMAGE_H
>
> #define BOOT0_MAGIC "eGON.BT0"
> +#define BROM_STAMP_VALUE 0x5f0a6c39
> #define SPL_SIGNATURE "SPL" /* marks "sunxi" SPL header */
> #define SPL_MAJOR_BITS 3
> #define SPL_MINOR_BITS 5
> diff --git a/tools/Makefile b/tools/Makefile
> index 51123fd9298..2c9a0c4c4e7 100644
> --- a/tools/Makefile
> +++ b/tools/Makefile
> @@ -104,6 +104,7 @@ dumpimage-mkimage-objs := aisimage.o \
> stm32image.o \
> $(ROCKCHIP_OBS) \
> socfpgaimage.o \
> + sunxi_egon.o \
> lib/crc16.o \
> lib/sha1.o \
> lib/sha256.o \
> diff --git a/tools/sunxi_egon.c b/tools/sunxi_egon.c
> new file mode 100644
> index 00000000000..8987794518a
> --- /dev/null
> +++ b/tools/sunxi_egon.c
> @@ -0,0 +1,136 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * (C) Copyright 2018 Arm Ltd.
> + */
> +
> +#include "imagetool.h"
> +#include <image.h>
> +
> +#include <sunxi_image.h>
> +
> +/*
> + * NAND requires 8K padding. SD/eMMC gets away with 512 bytes,
> + * but let's use the larger padding to cover both.
> + */
> +#define PAD_SIZE 8192
> +
> +static int egon_check_params(struct image_tool_params *params)
> +{
> + /* We just need a binary image file. */
> + return !params->dflag;
> +}
> +
> +static int egon_verify_header(unsigned char *ptr, int image_size,
> + struct image_tool_params *params)
> +{
> + const struct boot_file_head *header = (void *)ptr;
> + uint32_t length;
> +
> + /* First 4 bytes must be an ARM branch instruction. */
> + if ((le32_to_cpu(header->b_instruction) & 0xff000000) != 0xea000000)
> + return EXIT_FAILURE;
> +
> + if (memcmp(header->magic, BOOT0_MAGIC, sizeof(header->magic)))
> + return EXIT_FAILURE;
> +
> + length = le32_to_cpu(header->length);
> + /* Must be at least 512 byte aligned. */
> + if (length & 511)
> + return EXIT_FAILURE;
> +
> + /*
> + * Image could also contain U-Boot proper, so could be bigger.
> + * But it must not be shorter.
> + */
> + if (image_size < length)
> + return EXIT_FAILURE;
> +
> + return EXIT_SUCCESS;
> +}
> +
> +static void egon_print_header(const void *buf)
> +{
> + const struct boot_file_head *header = buf;
> +
> + printf("Allwinner eGON image, size: %d bytes\n",
> + le32_to_cpu(header->length));
> +
> + if (memcmp(header->spl_signature, SPL_SIGNATURE, 3))
> + return;
> +
> + printf("\tSPL header version %d.%d\n",
> + header->spl_signature[3] >> SPL_MINOR_BITS,
> + header->spl_signature[3] & ((1U << SPL_MINOR_BITS) - 1));
> + if (header->spl_signature[3] >= SPL_DT_HEADER_VERSION) {
> + uint32_t dt_name_offs = le32_to_cpu(header->dt_name_offset);
> +
> + if (dt_name_offs > 0)
> + printf("\tDT name: %s\n", (char *)buf + dt_name_offs);
> + }
> +}
> +
> +static void egon_set_header(void *buf, struct stat *sbuf, int infd,
> + struct image_tool_params *params)
> +{
> + struct boot_file_head *header = buf;
> + uint32_t *buf32 = buf;
> + uint32_t checksum = 0, value;
> + int i;
> +
> + /* Generate an ARM branch instruction to jump over the header. */
> + value = 0xea000000 | (sizeof(struct boot_file_head) / 4 - 2);
> + header->b_instruction = cpu_to_le32(value);
> +
> + memcpy(header->magic, BOOT0_MAGIC, sizeof(header->magic));
> + header->check_sum = cpu_to_le32(BROM_STAMP_VALUE);
> + header->length = cpu_to_le32(params->file_size);
> +
> + memcpy(header->spl_signature, SPL_SIGNATURE, 3);
> +
> + /* If an image name has been provided, use it as the DT name. */
> + if (params->imagename && params->imagename[0]) {
> + header->spl_signature[3] = SPL_DT_HEADER_VERSION;
> +
> + value = offsetof(struct boot_file_head, string_pool);
> + header->dt_name_offset = cpu_to_le32(value);
> +
> + strncpy((char *)header->string_pool, params->imagename, 52);
I get:
tools/sunxi_egon.c: In function 'egon_set_header':
tools/sunxi_egon.c:97:3: warning: 'strncpy' specified bound 52 equals
destination size [-Wstringop-truncation]
97 | strncpy((char *)header->string_pool, params->imagename, 52);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + /* Make sure we have a terminating zero byte. */
> + ((char *)header->string_pool)[51] = 0;
> + } else
> + header->spl_signature[3] = SPL_ENV_HEADER_VERSION;
> +
> + /* Calculate the checksum. Yes, it's that simple. */
> + for (i = 0; i < sbuf->st_size / 4; i++)
> + checksum += le32_to_cpu(buf32[i]);
> + header->check_sum = cpu_to_le32(checksum);
> +}
> +
> +static int egon_check_image_type(uint8_t type)
> +{
> + return type == IH_TYPE_SUNXI_EGON ? 0 : 1;
> +}
> +
> +static int egon_vrec_header(struct image_tool_params *params,
> + struct image_type_params *tparams)
> +{
> + tparams->hdr = calloc(sizeof(struct boot_file_head), 1);
> +
> + /* Return padding to 8K blocks. */
> + return ALIGN(params->file_size, PAD_SIZE) - params->file_size;
> +}
> +
> +U_BOOT_IMAGE_TYPE(
> + sunxi_egon,
> + "Allwinner eGON Boot Image support",
> + sizeof(struct boot_file_head),
> + NULL,
> + egon_check_params,
> + egon_verify_header,
> + egon_print_header,
> + egon_set_header,
> + NULL,
> + egon_check_image_type,
> + NULL,
> + egon_vrec_header
> +);
>
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