a188438175
This patch follows up on a discussion of ways to improve support
for the sunxi FEL ("USB boot") mechanism, especially with regard
to boot scripts, see:
https://groups.google.com/d/msg/linux-sunxi/wBEGUoLNRro/rHGq6nSYCQAJ
The idea is to convert the (currently unused) "pad" bytes in the
SPL header into an area where data can be passed to U-Boot. To
do this safely, we have to make sure that we're actually using
our "sunxi" flavor of the SPL, and not the Allwinner boot0.
The modified mksunxiboot introduces a special signature to the
SPL header in place of the "pub_head_size" field. This can be
used to reliably distinguish between compatible versions of sunxi
SPL and anything else (older variants or Allwinner's boot0).
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*
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* (C) Copyright 2007-2011
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* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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* Tom Cubie <tangliang@allwinnertech.com>
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*
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* a simple tool to generate bootable image for sunxi platform.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "asm/arch/spl.h"
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#define STAMP_VALUE 0x5F0A6C39
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/* check sum functon from sun4i boot code */
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int gen_check_sum(struct boot_file_head *head_p)
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{
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uint32_t length;
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uint32_t *buf;
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uint32_t loop;
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uint32_t i;
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uint32_t sum;
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length = le32_to_cpu(head_p->length);
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if ((length & 0x3) != 0) /* must 4-byte-aligned */
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return -1;
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buf = (uint32_t *)head_p;
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head_p->check_sum = cpu_to_le32(STAMP_VALUE); /* fill stamp */
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loop = length >> 2;
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/* calculate the sum */
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for (i = 0, sum = 0; i < loop; i++)
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sum += le32_to_cpu(buf[i]);
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/* write back check sum */
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head_p->check_sum = cpu_to_le32(sum);
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return 0;
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}
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#define ALIGN(x, a) __ALIGN_MASK((x), (typeof(x))(a)-1)
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#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
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#define SUN4I_SRAM_SIZE 0x7600 /* 0x7748+ is used by BROM */
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#define SRAM_LOAD_MAX_SIZE (SUN4I_SRAM_SIZE - sizeof(struct boot_file_head))
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/*
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* BROM (at least on A10 and A20) requires NAND-images to be explicitly aligned
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* to a multiple of 8K, and rejects the image otherwise. MMC-images are fine
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* with 512B blocks. To cater for both, align to the largest of the two.
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*/
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#define BLOCK_SIZE 0x2000
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struct boot_img {
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struct boot_file_head header;
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char code[SRAM_LOAD_MAX_SIZE];
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char pad[BLOCK_SIZE];
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};
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int main(int argc, char *argv[])
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{
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int fd_in, fd_out;
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struct boot_img img;
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unsigned file_size;
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int count;
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if (argc < 2) {
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printf("\tThis program makes an input bin file to sun4i " \
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"bootable image.\n" \
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"\tUsage: %s input_file out_putfile\n", argv[0]);
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return EXIT_FAILURE;
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}
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fd_in = open(argv[1], O_RDONLY);
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if (fd_in < 0) {
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perror("Open input file");
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return EXIT_FAILURE;
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}
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memset(&img, 0, sizeof(img));
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/* get input file size */
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file_size = lseek(fd_in, 0, SEEK_END);
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if (file_size > SRAM_LOAD_MAX_SIZE) {
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fprintf(stderr, "ERROR: File too large!\n");
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return EXIT_FAILURE;
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}
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fd_out = open(argv[2], O_WRONLY | O_CREAT, 0666);
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if (fd_out < 0) {
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perror("Open output file");
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return EXIT_FAILURE;
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}
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/* read file to buffer to calculate checksum */
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lseek(fd_in, 0, SEEK_SET);
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count = read(fd_in, img.code, file_size);
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if (count != file_size) {
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perror("Reading input image");
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return EXIT_FAILURE;
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}
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/* fill the header */
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img.header.b_instruction = /* b instruction */
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0xEA000000 | /* jump to the first instr after the header */
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((sizeof(struct boot_file_head) / sizeof(int) - 2)
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& 0x00FFFFFF);
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memcpy(img.header.magic, BOOT0_MAGIC, 8); /* no '0' termination */
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img.header.length =
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ALIGN(file_size + sizeof(struct boot_file_head), BLOCK_SIZE);
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img.header.b_instruction = cpu_to_le32(img.header.b_instruction);
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img.header.length = cpu_to_le32(img.header.length);
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memcpy(img.header.spl_signature, SPL_SIGNATURE, 3); /* "sunxi" marker */
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img.header.spl_signature[3] = SPL_HEADER_VERSION;
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gen_check_sum(&img.header);
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count = write(fd_out, &img, le32_to_cpu(img.header.length));
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if (count != le32_to_cpu(img.header.length)) {
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perror("Writing output");
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return EXIT_FAILURE;
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}
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close(fd_in);
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close(fd_out);
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return EXIT_SUCCESS;
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}
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