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rockchip: Add support for the SPI image

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The Rockchip boot ROM requires a particular file format for booting from SPI.
It consists of a 512-byte header encoded with RC4, some padding and then up
to 32KB of executable code in 2KB blocks, separated by 2KB empty blocks.

Add support to mkimage so that an SPL image (u-boot-spl-dtb.bin) can be
converted to this format. This allows booting from SPI flash on supported
machines.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2015-08-30 16:55:26 -06:00
parent f9a3c278b9
commit 10b84fe1b5
3 changed files with 122 additions and 1 deletions
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1
common/image.c
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@ -157,6 +157,7 @@ static const table_entry_t uimage_type[] = {
{ IH_TYPE_LPC32XXIMAGE, "lpc32xximage", "LPC32XX Boot Image", },
{ IH_TYPE_RKIMAGE, "rkimage", "Rockchip Boot Image" },
{ IH_TYPE_RKSD, "rksd", "Rockchip SD Boot Image" },
{ IH_TYPE_RKSPI, "rkspi", "Rockchip SPI Boot Image" },
{ -1, "", "", },
};

3
include/image.h
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@ -247,8 +247,9 @@ struct lmb;
#define IH_TYPE_LOADABLE 22 /* A list of typeless images */
#define IH_TYPE_RKIMAGE 23 /* Rockchip Boot Image */
#define IH_TYPE_RKSD 24 /* Rockchip SD card */
#define IH_TYPE_RKSPI 25 /* Rockchip SPI image */
#define IH_TYPE_COUNT 25 /* Number of image types */
#define IH_TYPE_COUNT 26 /* Number of image types */
/*
* Compression Types

119
tools/rkspi.c Normal file
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@ -0,0 +1,119 @@
/*
* (C) Copyright 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*
* See README.rockchip for details of the rkspi format
*/
#include "imagetool.h"
#include <image.h>
#include <rc4.h>
#include "mkimage.h"
#include "rkcommon.h"
enum {
RKSPI_SPL_HDR_START = RK_CODE1_OFFSET * RK_BLK_SIZE,
RKSPI_SPL_START = RKSPI_SPL_HDR_START + 4,
RKSPI_HEADER_LEN = RKSPI_SPL_START,
RKSPI_SECT_LEN = RK_BLK_SIZE * 4,
};
static char dummy_hdr[RKSPI_HEADER_LEN];
static int rkspi_check_params(struct image_tool_params *params)
{
return 0;
}
static int rkspi_verify_header(unsigned char *buf, int size,
struct image_tool_params *params)
{
return 0;
}
static void rkspi_print_header(const void *buf)
{
}
static void rkspi_set_header(void *buf, struct stat *sbuf, int ifd,
struct image_tool_params *params)
{
int sector;
unsigned int size;
int ret;
size = params->orig_file_size;
ret = rkcommon_set_header(buf, size);
debug("size %x\n", size);
if (ret) {
/* TODO(sjg@chromium.org): This method should return an error */
printf("Warning: SPL image is too large (size %#x) and will not boot\n",
size);
}
memcpy(buf + RKSPI_SPL_HDR_START, "RK32", 4);
/*
* Spread the image out so we only use the first 2KB of each 4KB
* region. This is a feature of the SPI format required by the Rockchip
* boot ROM. Its rationale is unknown.
*/
for (sector = size / RKSPI_SECT_LEN - 1; sector >= 0; sector--) {
printf("sector %u\n", sector);
memmove(buf + sector * RKSPI_SECT_LEN * 2,
buf + sector * RKSPI_SECT_LEN,
RKSPI_SECT_LEN);
memset(buf + sector * RKSPI_SECT_LEN * 2 + RKSPI_SECT_LEN,
'\0', RKSPI_SECT_LEN);
}
}
static int rkspi_extract_subimage(void *buf, struct image_tool_params *params)
{
return 0;
}
static int rkspi_check_image_type(uint8_t type)
{
if (type == IH_TYPE_RKSPI)
return EXIT_SUCCESS;
else
return EXIT_FAILURE;
}
/* We pad the file out to a fixed size - this method returns that size */
static int rkspi_vrec_header(struct image_tool_params *params,
struct image_type_params *tparams)
{
int pad_size;
pad_size = (RK_MAX_CODE1_SIZE + 0x7ff) / 0x800 * 0x800;
params->orig_file_size = pad_size;
/* We will double the image size due to the SPI format */
pad_size *= 2;
pad_size += RKSPI_SPL_HDR_START;
debug("pad_size %x\n", pad_size);
return pad_size - params->file_size;
}
/*
* rk_spi parameters
*/
U_BOOT_IMAGE_TYPE(
rkspi,
"Rockchip SPI Boot Image support",
RKSPI_HEADER_LEN,
dummy_hdr,
rkspi_check_params,
rkspi_verify_header,
rkspi_print_header,
rkspi_set_header,
rkspi_extract_subimage,
rkspi_check_image_type,
NULL,
rkspi_vrec_header
);