u-boot/common/spl/spl_fat.c
Marek Vasut 04ce5427bd spl: Weed out CONFIG_SYS_TEXT_BASE usage
The SPL loaders assume that the CONFIG_SYS_TEXT_BASE memory location
is available and can be corrupted by loading ie. uImage or fitImage
headers there. Sometimes it could be beneficial to load the headers
elsewhere, ie. if CONFIG_SYS_TEXT_BASE is not yet writable while we
still want to parse the image headers in some local onchip memory to
ie. extract firmware from that image.

Add the possibility to override the location where the headers get
loaded by introducing new function, spl_get_load_buffer() which takes
two arguments -- offset from the CONFIG_SYS_TEXT_BASE and size of the
data that are to be loaded there -- and returns a valid buffer address
or hangs the system. The default behavior is the same as before, add
the offset to CONFIG_SYS_TEXT_BASE and return that address. User can
override the weak spl_get_load_buffer() function though.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2018-09-25 21:48:43 -04:00

170 lines
3.8 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2014
* Texas Instruments, <www.ti.com>
*
* Dan Murphy <dmurphy@ti.com>
*
* FAT Image Functions copied from spl_mmc.c
*/
#include <common.h>
#include <spl.h>
#include <asm/u-boot.h>
#include <fat.h>
#include <errno.h>
#include <image.h>
#include <linux/libfdt.h>
static int fat_registered;
static int spl_register_fat_device(struct blk_desc *block_dev, int partition)
{
int err = 0;
if (fat_registered)
return err;
err = fat_register_device(block_dev, partition);
if (err) {
#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
printf("%s: fat register err - %d\n", __func__, err);
#endif
return err;
}
fat_registered = 1;
return err;
}
static ulong spl_fit_read(struct spl_load_info *load, ulong file_offset,
ulong size, void *buf)
{
loff_t actread;
int ret;
char *filename = (char *)load->filename;
ret = fat_read_file(filename, buf, file_offset, size, &actread);
if (ret)
return ret;
return actread;
}
int spl_load_image_fat(struct spl_image_info *spl_image,
struct blk_desc *block_dev, int partition,
const char *filename)
{
int err;
struct image_header *header;
err = spl_register_fat_device(block_dev, partition);
if (err)
goto end;
header = spl_get_load_buffer(-sizeof(*header), sizeof(*header));
err = file_fat_read(filename, header, sizeof(struct image_header));
if (err <= 0)
goto end;
if (IS_ENABLED(CONFIG_SPL_LOAD_FIT_FULL) &&
image_get_magic(header) == FDT_MAGIC) {
err = file_fat_read(filename, (void *)CONFIG_SYS_LOAD_ADDR, 0);
if (err <= 0)
goto end;
err = spl_parse_image_header(spl_image,
(struct image_header *)CONFIG_SYS_LOAD_ADDR);
if (err == -EAGAIN)
return err;
if (err == 0)
err = 1;
} else if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
image_get_magic(header) == FDT_MAGIC) {
struct spl_load_info load;
debug("Found FIT\n");
load.read = spl_fit_read;
load.bl_len = 1;
load.filename = (void *)filename;
load.priv = NULL;
return spl_load_simple_fit(spl_image, &load, 0, header);
} else {
err = spl_parse_image_header(spl_image, header);
if (err)
goto end;
err = file_fat_read(filename,
(u8 *)(uintptr_t)spl_image->load_addr, 0);
}
end:
#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
if (err <= 0)
printf("%s: error reading image %s, err - %d\n",
__func__, filename, err);
#endif
return (err <= 0);
}
#ifdef CONFIG_SPL_OS_BOOT
int spl_load_image_fat_os(struct spl_image_info *spl_image,
struct blk_desc *block_dev, int partition)
{
int err;
__maybe_unused char *file;
err = spl_register_fat_device(block_dev, partition);
if (err)
return err;
#if defined(CONFIG_SPL_ENV_SUPPORT) && defined(CONFIG_SPL_OS_BOOT)
file = env_get("falcon_args_file");
if (file) {
err = file_fat_read(file, (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
if (err <= 0) {
printf("spl: error reading image %s, err - %d, falling back to default\n",
file, err);
goto defaults;
}
file = env_get("falcon_image_file");
if (file) {
err = spl_load_image_fat(spl_image, block_dev,
partition, file);
if (err != 0) {
puts("spl: falling back to default\n");
goto defaults;
}
return 0;
} else
puts("spl: falcon_image_file not set in environment, falling back to default\n");
} else
puts("spl: falcon_args_file not set in environment, falling back to default\n");
defaults:
#endif
err = file_fat_read(CONFIG_SPL_FS_LOAD_ARGS_NAME,
(void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
if (err <= 0) {
#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
printf("%s: error reading image %s, err - %d\n",
__func__, CONFIG_SPL_FS_LOAD_ARGS_NAME, err);
#endif
return -1;
}
return spl_load_image_fat(spl_image, block_dev, partition,
CONFIG_SPL_FS_LOAD_KERNEL_NAME);
}
#else
int spl_load_image_fat_os(struct spl_image_info *spl_image,
struct blk_desc *block_dev, int partition)
{
return -ENOSYS;
}
#endif