485 lines
12 KiB
C
485 lines
12 KiB
C
/*
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* Allwinner NAND randomizer and image builder implementation:
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*
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* Copyright © 2016 NextThing Co.
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* Copyright © 2016 Free Electrons
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*
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* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
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*
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*/
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#include <linux/bch.h>
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#include <getopt.h>
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#include <version.h>
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#define BCH_PRIMITIVE_POLY 0x5803
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
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struct image_info {
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int ecc_strength;
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int ecc_step_size;
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int page_size;
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int oob_size;
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int usable_page_size;
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int eraseblock_size;
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int scramble;
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int boot0;
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off_t offset;
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const char *source;
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const char *dest;
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};
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static void swap_bits(uint8_t *buf, int len)
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{
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int i, j;
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for (j = 0; j < len; j++) {
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uint8_t byte = buf[j];
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buf[j] = 0;
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for (i = 0; i < 8; i++) {
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if (byte & (1 << i))
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buf[j] |= (1 << (7 - i));
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}
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}
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}
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static uint16_t lfsr_step(uint16_t state, int count)
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{
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state &= 0x7fff;
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while (count--)
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state = ((state >> 1) |
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((((state >> 0) ^ (state >> 1)) & 1) << 14)) & 0x7fff;
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return state;
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}
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static uint16_t default_scrambler_seeds[] = {
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0x2b75, 0x0bd0, 0x5ca3, 0x62d1, 0x1c93, 0x07e9, 0x2162, 0x3a72,
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0x0d67, 0x67f9, 0x1be7, 0x077d, 0x032f, 0x0dac, 0x2716, 0x2436,
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0x7922, 0x1510, 0x3860, 0x5287, 0x480f, 0x4252, 0x1789, 0x5a2d,
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0x2a49, 0x5e10, 0x437f, 0x4b4e, 0x2f45, 0x216e, 0x5cb7, 0x7130,
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0x2a3f, 0x60e4, 0x4dc9, 0x0ef0, 0x0f52, 0x1bb9, 0x6211, 0x7a56,
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0x226d, 0x4ea7, 0x6f36, 0x3692, 0x38bf, 0x0c62, 0x05eb, 0x4c55,
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0x60f4, 0x728c, 0x3b6f, 0x2037, 0x7f69, 0x0936, 0x651a, 0x4ceb,
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0x6218, 0x79f3, 0x383f, 0x18d9, 0x4f05, 0x5c82, 0x2912, 0x6f17,
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0x6856, 0x5938, 0x1007, 0x61ab, 0x3e7f, 0x57c2, 0x542f, 0x4f62,
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0x7454, 0x2eac, 0x7739, 0x42d4, 0x2f90, 0x435a, 0x2e52, 0x2064,
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0x637c, 0x66ad, 0x2c90, 0x0bad, 0x759c, 0x0029, 0x0986, 0x7126,
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0x1ca7, 0x1605, 0x386a, 0x27f5, 0x1380, 0x6d75, 0x24c3, 0x0f8e,
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0x2b7a, 0x1418, 0x1fd1, 0x7dc1, 0x2d8e, 0x43af, 0x2267, 0x7da3,
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0x4e3d, 0x1338, 0x50db, 0x454d, 0x764d, 0x40a3, 0x42e6, 0x262b,
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0x2d2e, 0x1aea, 0x2e17, 0x173d, 0x3a6e, 0x71bf, 0x25f9, 0x0a5d,
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0x7c57, 0x0fbe, 0x46ce, 0x4939, 0x6b17, 0x37bb, 0x3e91, 0x76db,
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};
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static uint16_t brom_scrambler_seeds[] = { 0x4a80 };
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static void scramble(const struct image_info *info,
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int page, uint8_t *data, int datalen)
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{
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uint16_t state;
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int i;
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/* Boot0 is always scrambled no matter the command line option. */
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if (info->boot0) {
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state = brom_scrambler_seeds[0];
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} else {
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unsigned seedmod = info->eraseblock_size / info->page_size;
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/* Bail out earlier if the user didn't ask for scrambling. */
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if (!info->scramble)
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return;
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if (seedmod > ARRAY_SIZE(default_scrambler_seeds))
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seedmod = ARRAY_SIZE(default_scrambler_seeds);
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state = default_scrambler_seeds[page % seedmod];
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}
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/* Prepare the initial state... */
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state = lfsr_step(state, 15);
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/* and start scrambling data. */
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for (i = 0; i < datalen; i++) {
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data[i] ^= state;
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state = lfsr_step(state, 8);
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}
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}
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static int write_page(const struct image_info *info, uint8_t *buffer,
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FILE *src, FILE *rnd, FILE *dst,
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struct bch_control *bch, int page)
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{
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int steps = info->usable_page_size / info->ecc_step_size;
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int eccbytes = DIV_ROUND_UP(info->ecc_strength * 14, 8);
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off_t pos = ftell(dst);
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size_t pad, cnt;
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int i;
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if (eccbytes % 2)
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eccbytes++;
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memset(buffer, 0xff, info->page_size + info->oob_size);
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cnt = fread(buffer, 1, info->usable_page_size, src);
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if (!cnt) {
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if (!feof(src)) {
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fprintf(stderr,
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"Failed to read data from the source\n");
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return -1;
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} else {
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return 0;
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}
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}
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fwrite(buffer, info->page_size + info->oob_size, 1, dst);
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for (i = 0; i < info->usable_page_size; i++) {
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if (buffer[i] != 0xff)
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break;
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}
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/* We leave empty pages at 0xff. */
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if (i == info->usable_page_size)
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return 0;
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/* Restore the source pointer to read it again. */
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fseek(src, -cnt, SEEK_CUR);
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/* Randomize unused space if scrambling is required. */
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if (info->scramble) {
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int offs;
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if (info->boot0) {
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size_t ret;
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offs = steps * (info->ecc_step_size + eccbytes + 4);
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cnt = info->page_size + info->oob_size - offs;
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ret = fread(buffer + offs, 1, cnt, rnd);
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if (!ret && !feof(rnd)) {
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fprintf(stderr,
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"Failed to read random data\n");
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return -1;
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}
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} else {
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offs = info->page_size + (steps * (eccbytes + 4));
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cnt = info->page_size + info->oob_size - offs;
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memset(buffer + offs, 0xff, cnt);
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scramble(info, page, buffer + offs, cnt);
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}
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fseek(dst, pos + offs, SEEK_SET);
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fwrite(buffer + offs, cnt, 1, dst);
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}
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for (i = 0; i < steps; i++) {
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int ecc_offs, data_offs;
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uint8_t *ecc;
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memset(buffer, 0xff, info->ecc_step_size + eccbytes + 4);
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ecc = buffer + info->ecc_step_size + 4;
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if (info->boot0) {
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data_offs = i * (info->ecc_step_size + eccbytes + 4);
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ecc_offs = data_offs + info->ecc_step_size + 4;
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} else {
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data_offs = i * info->ecc_step_size;
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ecc_offs = info->page_size + 4 + (i * (eccbytes + 4));
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}
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cnt = fread(buffer, 1, info->ecc_step_size, src);
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if (!cnt && !feof(src)) {
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fprintf(stderr,
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"Failed to read data from the source\n");
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return -1;
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}
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pad = info->ecc_step_size - cnt;
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if (pad) {
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if (info->scramble && info->boot0) {
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size_t ret;
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ret = fread(buffer + cnt, 1, pad, rnd);
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if (!ret && !feof(rnd)) {
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fprintf(stderr,
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"Failed to read random data\n");
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return -1;
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}
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} else {
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memset(buffer + cnt, 0xff, pad);
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}
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}
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memset(ecc, 0, eccbytes);
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swap_bits(buffer, info->ecc_step_size + 4);
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encode_bch(bch, buffer, info->ecc_step_size + 4, ecc);
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swap_bits(buffer, info->ecc_step_size + 4);
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swap_bits(ecc, eccbytes);
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scramble(info, page, buffer, info->ecc_step_size + 4 + eccbytes);
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fseek(dst, pos + data_offs, SEEK_SET);
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fwrite(buffer, info->ecc_step_size, 1, dst);
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fseek(dst, pos + ecc_offs - 4, SEEK_SET);
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fwrite(ecc - 4, eccbytes + 4, 1, dst);
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}
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/* Fix BBM. */
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fseek(dst, pos + info->page_size, SEEK_SET);
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memset(buffer, 0xff, 2);
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fwrite(buffer, 2, 1, dst);
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/* Make dst pointer point to the next page. */
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fseek(dst, pos + info->page_size + info->oob_size, SEEK_SET);
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return 0;
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}
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static int create_image(const struct image_info *info)
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{
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off_t page = info->offset / info->page_size;
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struct bch_control *bch;
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FILE *src, *dst, *rnd;
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uint8_t *buffer;
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bch = init_bch(14, info->ecc_strength, BCH_PRIMITIVE_POLY);
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if (!bch) {
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fprintf(stderr, "Failed to init the BCH engine\n");
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return -1;
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}
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buffer = malloc(info->page_size + info->oob_size);
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if (!buffer) {
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fprintf(stderr, "Failed to allocate the NAND page buffer\n");
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return -1;
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}
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memset(buffer, 0xff, info->page_size + info->oob_size);
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src = fopen(info->source, "r");
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if (!src) {
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fprintf(stderr, "Failed to open source file (%s)\n",
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info->source);
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return -1;
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}
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dst = fopen(info->dest, "w");
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if (!dst) {
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fprintf(stderr, "Failed to open dest file (%s)\n", info->dest);
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return -1;
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}
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rnd = fopen("/dev/urandom", "r");
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if (!rnd) {
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fprintf(stderr, "Failed to open /dev/urandom\n");
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return -1;
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}
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while (!feof(src)) {
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int ret;
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ret = write_page(info, buffer, src, rnd, dst, bch, page++);
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if (ret)
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return ret;
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}
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return 0;
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}
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static void display_help(int status)
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{
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fprintf(status == EXIT_SUCCESS ? stdout : stderr,
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"sunxi-nand-image-builder %s\n"
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"\n"
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"Usage: sunxi-nand-image-builder [OPTIONS] source-image output-image\n"
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"\n"
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"Creates a raw NAND image that can be read by the sunxi NAND controller.\n"
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"\n"
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"-h --help Display this help and exit\n"
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"-c <str>/<step> --ecc=<str>/<step> ECC config (strength/step-size)\n"
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"-p <size> --page=<size> Page size\n"
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"-o <size> --oob=<size> OOB size\n"
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"-u <size> --usable=<size> Usable page size\n"
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"-e <size> --eraseblock=<size> Erase block size\n"
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"-b --boot0 Build a boot0 image.\n"
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"-s --scramble Scramble data\n"
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"-a <offset> --address=<offset> Where the image will be programmed.\n"
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"\n"
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"Notes:\n"
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"All the information you need to pass to this tool should be part of\n"
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"the NAND datasheet.\n"
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"\n"
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"The NAND controller only supports the following ECC configs\n"
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" Valid ECC strengths: 16, 24, 28, 32, 40, 48, 56, 60 and 64\n"
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" Valid ECC step size: 512 and 1024\n"
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"\n"
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"If you are building a boot0 image, you'll have specify extra options.\n"
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"These options should be chosen based on the layouts described here:\n"
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" http://linux-sunxi.org/NAND#More_information_on_BROM_NAND\n"
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"\n"
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" --usable should be assigned the 'Hardware page' value\n"
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" --ecc should be assigned the 'ECC capacity'/'ECC page' values\n"
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" --usable should be smaller than --page\n"
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"\n"
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"The --address option is only required for non-boot0 images that are \n"
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"meant to be programmed at a non eraseblock aligned offset.\n"
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"\n"
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"Examples:\n"
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" The H27UCG8T2BTR-BC NAND exposes\n"
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" * 16k pages\n"
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" * 1280 OOB bytes per page\n"
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" * 4M eraseblocks\n"
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" * requires data scrambling\n"
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" * expects a minimum ECC of 40bits/1024bytes\n"
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"\n"
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" A normal image can be generated with\n"
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" sunxi-nand-image-builder -p 16384 -o 1280 -e 0x400000 -s -c 40/1024\n"
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" A boot0 image can be generated with\n"
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" sunxi-nand-image-builder -p 16384 -o 1280 -e 0x400000 -s -b -u 4096 -c 64/1024\n",
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PLAIN_VERSION);
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exit(status);
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}
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static int check_image_info(struct image_info *info)
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{
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static int valid_ecc_strengths[] = { 16, 24, 28, 32, 40, 48, 56, 60, 64 };
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int eccbytes, eccsteps;
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unsigned i;
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if (!info->page_size) {
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fprintf(stderr, "--page is missing\n");
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return -EINVAL;
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}
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if (!info->page_size) {
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fprintf(stderr, "--oob is missing\n");
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return -EINVAL;
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}
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if (!info->eraseblock_size) {
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fprintf(stderr, "--eraseblock is missing\n");
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return -EINVAL;
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}
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if (info->ecc_step_size != 512 && info->ecc_step_size != 1024) {
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fprintf(stderr, "Invalid ECC step argument: %d\n",
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info->ecc_step_size);
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return -EINVAL;
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}
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for (i = 0; i < ARRAY_SIZE(valid_ecc_strengths); i++) {
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if (valid_ecc_strengths[i] == info->ecc_strength)
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break;
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}
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if (i == ARRAY_SIZE(valid_ecc_strengths)) {
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fprintf(stderr, "Invalid ECC strength argument: %d\n",
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info->ecc_strength);
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return -EINVAL;
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}
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eccbytes = DIV_ROUND_UP(info->ecc_strength * 14, 8);
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if (eccbytes % 2)
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eccbytes++;
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eccbytes += 4;
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eccsteps = info->usable_page_size / info->ecc_step_size;
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if (info->page_size + info->oob_size <
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info->usable_page_size + (eccsteps * eccbytes)) {
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fprintf(stderr,
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"ECC bytes do not fit in the NAND page, choose a weaker ECC\n");
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return -EINVAL;
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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struct image_info info;
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memset(&info, 0, sizeof(info));
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/*
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* Process user arguments
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*/
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for (;;) {
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int option_index = 0;
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char *endptr = NULL;
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static const struct option long_options[] = {
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{"help", no_argument, 0, 'h'},
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{"ecc", required_argument, 0, 'c'},
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{"page", required_argument, 0, 'p'},
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{"oob", required_argument, 0, 'o'},
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{"usable", required_argument, 0, 'u'},
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{"eraseblock", required_argument, 0, 'e'},
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{"boot0", no_argument, 0, 'b'},
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{"scramble", no_argument, 0, 's'},
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{"address", required_argument, 0, 'a'},
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{0, 0, 0, 0},
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};
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int c = getopt_long(argc, argv, "c:p:o:u:e:ba:sh",
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long_options, &option_index);
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if (c == EOF)
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break;
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switch (c) {
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case 'h':
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display_help(0);
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break;
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case 's':
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info.scramble = 1;
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break;
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case 'c':
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info.ecc_strength = strtol(optarg, &endptr, 0);
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if (*endptr == '/')
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info.ecc_step_size = strtol(endptr + 1, NULL, 0);
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break;
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case 'p':
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info.page_size = strtol(optarg, NULL, 0);
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break;
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case 'o':
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info.oob_size = strtol(optarg, NULL, 0);
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break;
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case 'u':
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info.usable_page_size = strtol(optarg, NULL, 0);
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break;
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case 'e':
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info.eraseblock_size = strtol(optarg, NULL, 0);
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break;
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case 'b':
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info.boot0 = 1;
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break;
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case 'a':
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info.offset = strtoull(optarg, NULL, 0);
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break;
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case '?':
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display_help(-1);
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break;
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}
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}
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if ((argc - optind) != 2)
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display_help(-1);
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info.source = argv[optind];
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info.dest = argv[optind + 1];
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if (!info.boot0) {
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info.usable_page_size = info.page_size;
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} else if (!info.usable_page_size) {
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if (info.page_size > 8192)
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info.usable_page_size = 8192;
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else if (info.page_size > 4096)
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info.usable_page_size = 4096;
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else
|
|
info.usable_page_size = 1024;
|
|
}
|
|
|
|
if (check_image_info(&info))
|
|
display_help(-1);
|
|
|
|
return create_image(&info);
|
|
}
|