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https://github.com/brain-hackers/u-boot-brain
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04ce5427bd
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>
154 lines
3.8 KiB
C
154 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2011
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* Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
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*/
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#include <common.h>
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#include <config.h>
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#include <spl.h>
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#include <asm/io.h>
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#include <nand.h>
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#include <linux/libfdt_env.h>
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#include <fdt.h>
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#if defined(CONFIG_SPL_NAND_RAW_ONLY)
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static int spl_nand_load_image(struct spl_image_info *spl_image,
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struct spl_boot_device *bootdev)
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{
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nand_init();
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nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
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CONFIG_SYS_NAND_U_BOOT_SIZE,
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(void *)CONFIG_SYS_NAND_U_BOOT_DST);
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spl_set_header_raw_uboot(spl_image);
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nand_deselect();
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return 0;
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}
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#else
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static ulong spl_nand_fit_read(struct spl_load_info *load, ulong offs,
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ulong size, void *dst)
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{
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int ret;
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ret = nand_spl_load_image(offs, size, dst);
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if (!ret)
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return size;
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else
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return 0;
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}
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static int spl_nand_load_element(struct spl_image_info *spl_image,
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int offset, struct image_header *header)
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{
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int err;
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err = nand_spl_load_image(offset, sizeof(*header), (void *)header);
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if (err)
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return err;
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if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
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image_get_magic(header) == FDT_MAGIC) {
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struct spl_load_info load;
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debug("Found FIT\n");
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load.dev = NULL;
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load.priv = NULL;
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load.filename = NULL;
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load.bl_len = 1;
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load.read = spl_nand_fit_read;
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return spl_load_simple_fit(spl_image, &load, offset, header);
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} else {
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err = spl_parse_image_header(spl_image, header);
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if (err)
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return err;
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return nand_spl_load_image(offset, spl_image->size,
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(void *)(ulong)spl_image->load_addr);
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}
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}
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static int spl_nand_load_image(struct spl_image_info *spl_image,
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struct spl_boot_device *bootdev)
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{
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int err;
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struct image_header *header;
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int *src __attribute__((unused));
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int *dst __attribute__((unused));
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#ifdef CONFIG_SPL_NAND_SOFTECC
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debug("spl: nand - using sw ecc\n");
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#else
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debug("spl: nand - using hw ecc\n");
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#endif
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nand_init();
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header = spl_get_load_buffer(0, sizeof(*header));
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#ifdef CONFIG_SPL_OS_BOOT
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if (!spl_start_uboot()) {
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/*
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* load parameter image
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* load to temp position since nand_spl_load_image reads
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* a whole block which is typically larger than
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* CONFIG_CMD_SPL_WRITE_SIZE therefore may overwrite
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* following sections like BSS
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*/
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nand_spl_load_image(CONFIG_CMD_SPL_NAND_OFS,
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CONFIG_CMD_SPL_WRITE_SIZE,
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(void *)CONFIG_SYS_TEXT_BASE);
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/* copy to destintion */
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for (dst = (int *)CONFIG_SYS_SPL_ARGS_ADDR,
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src = (int *)CONFIG_SYS_TEXT_BASE;
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src < (int *)(CONFIG_SYS_TEXT_BASE +
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CONFIG_CMD_SPL_WRITE_SIZE);
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src++, dst++) {
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writel(readl(src), dst);
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}
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/* load linux */
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nand_spl_load_image(CONFIG_SYS_NAND_SPL_KERNEL_OFFS,
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sizeof(*header), (void *)header);
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err = spl_parse_image_header(spl_image, header);
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if (err)
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return err;
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if (header->ih_os == IH_OS_LINUX) {
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/* happy - was a linux */
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err = nand_spl_load_image(
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CONFIG_SYS_NAND_SPL_KERNEL_OFFS,
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spl_image->size,
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(void *)spl_image->load_addr);
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nand_deselect();
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return err;
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} else {
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puts("The Expected Linux image was not "
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"found. Please check your NAND "
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"configuration.\n");
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puts("Trying to start u-boot now...\n");
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}
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}
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#endif
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#ifdef CONFIG_NAND_ENV_DST
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spl_nand_load_element(spl_image, CONFIG_ENV_OFFSET, header);
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#ifdef CONFIG_ENV_OFFSET_REDUND
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spl_nand_load_element(spl_image, CONFIG_ENV_OFFSET_REDUND, header);
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#endif
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#endif
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/* Load u-boot */
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err = spl_nand_load_element(spl_image, CONFIG_SYS_NAND_U_BOOT_OFFS,
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header);
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#ifdef CONFIG_SYS_NAND_U_BOOT_OFFS_REDUND
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#if CONFIG_SYS_NAND_U_BOOT_OFFS != CONFIG_SYS_NAND_U_BOOT_OFFS_REDUND
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if (err)
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err = spl_nand_load_element(spl_image,
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CONFIG_SYS_NAND_U_BOOT_OFFS_REDUND,
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header);
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#endif
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#endif
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nand_deselect();
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return err;
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}
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#endif
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/* Use priorty 1 so that Ubi can override this */
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SPL_LOAD_IMAGE_METHOD("NAND", 1, BOOT_DEVICE_NAND, spl_nand_load_image);
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