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@@ -0,0 +1,142 @@
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+/*
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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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+
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+/* boot head definition from sun4i boot code */
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+struct boot_file_head {
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+ uint32_t b_instruction; /* one intruction jumping to real code */
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+ uint8_t magic[8]; /* ="eGON.BT0" or "eGON.BT1", not C-style str */
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+ uint32_t check_sum; /* generated by PC */
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+ uint32_t length; /* generated by PC */
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+ /*
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+ * We use a simplified header, only filling in what is needed
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+ * by the boot ROM. To be compatible with Allwinner tools we
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+ * would need to implement the proper fields here instead of
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+ * padding.
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+ */
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+ uint8_t pad[12]; /* align to 32 bytes */
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+};
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+
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+#define BOOT0_MAGIC "eGON.BT0"
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+#define STAMP_VALUE 0x5F0A6C39
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+
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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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+
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+ length = 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 = STAMP_VALUE; /* fill stamp */
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+ loop = length >> 2;
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+
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+ /* calculate the sum */
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+ for (i = 0, sum = 0; i < loop; i++)
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+ sum += buf[i];
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+
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+ /* write back check sum */
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+ head_p->check_sum = sum;
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+
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+ return 0;
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+}
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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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+
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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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+#define BLOCK_SIZE 512
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+
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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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+
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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, load_size;
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+ int count;
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+
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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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+
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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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+
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+ memset(img.pad, 0, BLOCK_SIZE);
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+
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+ /* get input file size */
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+ file_size = lseek(fd_in, 0, SEEK_END);
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+
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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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+ } else {
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+ load_size = ALIGN(file_size, sizeof(int));
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+ }
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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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+
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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, load_size);
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+ if (count != load_size) {
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+ perror("Reading input image");
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+ return EXIT_FAILURE;
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+ }
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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(load_size + sizeof(struct boot_file_head), BLOCK_SIZE);
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+ gen_check_sum(&img.header);
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+
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+ count = write(fd_out, &img, img.header.length);
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+ if (count != 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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+
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+ close(fd_in);
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+ close(fd_out);
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+
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+ return EXIT_SUCCESS;
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+}
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