sunxi: non-FEL SPL boot support for sun7i

Add support for booting from an MMC card.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Henrik Nordström <henrik@henriknordstrom.net>
Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Reviewed-by: Marek Vasut <marex@denx.de>
Cc: Tom Cubie <Mr.hipboi@gmail.com>
Reviewed-by: Tom Rini <trini@ti.com>

tools/mksunxiboot.c

@@ -0,0 +1,142 @@
+/*
+ * (C) Copyright 2007-2011
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ * Tom Cubie <tangliang@allwinnertech.com>
+ *
+ * a simple tool to generate bootable image for sunxi platform.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+/* boot head definition from sun4i boot code */
+struct boot_file_head {
+	uint32_t b_instruction;	/* one intruction jumping to real code */
+	uint8_t magic[8];	/* ="eGON.BT0" or "eGON.BT1", not C-style str */
+	uint32_t check_sum;	/* generated by PC */
+	uint32_t length;	/* generated by PC */
+	/*
+	 * We use a simplified header, only filling in what is needed
+	 * by the boot ROM. To be compatible with Allwinner tools we
+	 * would need to implement the proper fields here instead of
+	 * padding.
+	 */
+	uint8_t pad[12];		/* align to 32 bytes */
+};
+
+#define BOOT0_MAGIC                     "eGON.BT0"
+#define STAMP_VALUE                     0x5F0A6C39
+
+/* check sum functon from sun4i boot code */
+int gen_check_sum(struct boot_file_head *head_p)
+{
+	uint32_t length;
+	uint32_t *buf;
+	uint32_t loop;
+	uint32_t i;
+	uint32_t sum;
+
+	length = head_p->length;
+	if ((length & 0x3) != 0)	/* must 4-byte-aligned */
+		return -1;
+	buf = (uint32_t *)head_p;
+	head_p->check_sum = STAMP_VALUE;	/* fill stamp */
+	loop = length >> 2;
+
+	/* calculate the sum */
+	for (i = 0, sum = 0; i < loop; i++)
+		sum += buf[i];
+
+	/* write back check sum */
+	head_p->check_sum = sum;
+
+	return 0;
+}
+
+#define ALIGN(x, a) __ALIGN_MASK((x), (typeof(x))(a)-1)
+#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
+
+#define SUN4I_SRAM_SIZE 0x7600	/* 0x7748+ is used by BROM */
+#define SRAM_LOAD_MAX_SIZE (SUN4I_SRAM_SIZE - sizeof(struct boot_file_head))
+#define BLOCK_SIZE 512
+
+struct boot_img {
+	struct boot_file_head header;
+	char code[SRAM_LOAD_MAX_SIZE];
+	char pad[BLOCK_SIZE];
+};
+
+int main(int argc, char *argv[])
+{
+	int fd_in, fd_out;
+	struct boot_img img;
+	unsigned file_size, load_size;
+	int count;
+
+	if (argc < 2) {
+		printf("\tThis program makes an input bin file to sun4i " \
+		       "bootable image.\n" \
+		       "\tUsage: %s input_file out_putfile\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	fd_in = open(argv[1], O_RDONLY);
+	if (fd_in < 0) {
+		perror("Open input file");
+		return EXIT_FAILURE;
+	}
+
+	memset(img.pad, 0, BLOCK_SIZE);
+
+	/* get input file size */
+	file_size = lseek(fd_in, 0, SEEK_END);
+
+	if (file_size > SRAM_LOAD_MAX_SIZE) {
+		fprintf(stderr, "ERROR: File too large!\n");
+		return EXIT_FAILURE;
+	} else {
+		load_size = ALIGN(file_size, sizeof(int));
+	}
+
+	fd_out = open(argv[2], O_WRONLY | O_CREAT, 0666);
+	if (fd_out < 0) {
+		perror("Open output file");
+		return EXIT_FAILURE;
+	}
+
+	/* read file to buffer to calculate checksum */
+	lseek(fd_in, 0, SEEK_SET);
+	count = read(fd_in, img.code, load_size);
+	if (count != load_size) {
+		perror("Reading input image");
+		return EXIT_FAILURE;
+	}
+
+	/* fill the header */
+	img.header.b_instruction =	/* b instruction */
+		0xEA000000 |	/* jump to the first instr after the header */
+		((sizeof(struct boot_file_head) / sizeof(int) - 2)
+		 & 0x00FFFFFF);
+	memcpy(img.header.magic, BOOT0_MAGIC, 8);	/* no '0' termination */
+	img.header.length =
+		ALIGN(load_size + sizeof(struct boot_file_head), BLOCK_SIZE);
+	gen_check_sum(&img.header);
+
+	count = write(fd_out, &img, img.header.length);
+	if (count != img.header.length) {
+		perror("Writing output");
+		return EXIT_FAILURE;
+	}
+
+	close(fd_in);
+	close(fd_out);
+
+	return EXIT_SUCCESS;
+}