Am 30.05.2016 um 17:12 schrieb Boris Brezillon:
Generating raw NAND images is particularly useful for boot0 images
creation since the mainline driver is not supporting the funky layout
used by Allwinner's ROM code to load the boot0 binary from NAND.
This tools also allows one to generate raw images for 'normal' partitions
so that they can be flashed before soldering on the NAND on the board
(using a regular NAND programmer).
The tool takes care of generating ECC bytes and randomizing data as
expected by the NAND controller, and re-arranging the ECC/data sections
correctly.
Signed-off-by: Boris Brezillon <boris.brezil...@free-electrons.com>
---
Hi Siarhei,
You seem to be the one maintaining the sunxi-tools repo, and I'm not sure
what's the process to submit patches (PR from github, or submitting
patches to the linux-sunxi ML).
The tool I'm adding here is really useful when it comes to creating NAND
images, and I'd like to see it included in the sunxi-tools.
Let me know if you have any questions.
Thanks,
Boris
Makefile | 2 +-
README.md | 3 +
nand-image-builder.c | 1122 ++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1126 insertions(+), 1 deletion(-)
create mode 100644 nand-image-builder.c
diff --git a/Makefile b/Makefile
index 623dda1..434f084 100644
--- a/Makefile
+++ b/Makefile
@@ -33,7 +33,7 @@ DEFINES += -D_NETBSD_SOURCE
endif
# Tools useful on host and target
-TOOLS = sunxi-fexc sunxi-bootinfo sunxi-fel sunxi-nand-part
+TOOLS = sunxi-fexc sunxi-bootinfo sunxi-fel sunxi-nand-part
sunxi-nand-image-builder
Given the rather specific nature of this utility, I'm inclined to prefer
that
it be added to the MISC_TOOLS target instead.
# Symlinks to sunxi-fexc
FEXC_LINKS = bin2fex fex2bin
diff --git a/README.md b/README.md
index ada5432..b0d8788 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,9 @@ Manipulate PIO register dumps
### sunxi-nand-part
Tool for manipulating Allwinner NAND partition tables
+### sunxi-nand-image-builder
+Tool used to create raw NAND images (including boot0 images)
+
### jtag-loop.sunxi
ARM native boot helper to force the SD port into JTAG and then stop,
to ease debugging of bootloaders.
diff --git a/nand-image-builder.c b/nand-image-builder.c
new file mode 100644
index 0000000..f3ad03c
--- /dev/null
+++ b/nand-image-builder.c
@@ -0,0 +1,1122 @@
+/*
+ * Generic binary BCH encoding/decoding library
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright © 2011 Parrot S.A.
+ *
+ * Author: Ivan Djelic <ivan.dje...@parrot.com>
+ *
+ * Description:
+ *
+ * This library provides runtime configurable encoding/decoding of binary
+ * Bose-Chaudhuri-Hocquenghem (BCH) codes.
+ *
+ * Call init_bch to get a pointer to a newly allocated bch_control structure
for
+ * the given m (Galois field order), t (error correction capability) and
+ * (optional) primitive polynomial parameters.
+ *
+ * Call encode_bch to compute and store ecc parity bytes to a given buffer.
+ * Call decode_bch to detect and locate errors in received data.
+ *
+ * On systems supporting hw BCH features, intermediate results may be provided
+ * to decode_bch in order to skip certain steps. See decode_bch() documentation
+ * for details.
+ *
+ * Option CONFIG_BCH_CONST_PARAMS can be used to force fixed values of
+ * parameters m and t; thus allowing extra compiler optimizations and providing
+ * better (up to 2x) encoding performance. Using this option makes sense when
+ * (m,t) are fixed and known in advance, e.g. when using BCH error correction
+ * on a particular NAND flash device.
+ *
+ * Algorithmic details:
+ *
+ * Encoding is performed by processing 32 input bits in parallel, using 4
+ * remainder lookup tables.
+ *
+ * The final stage of decoding involves the following internal steps:
+ * a. Syndrome computation
+ * b. Error locator polynomial computation using Berlekamp-Massey algorithm
+ * c. Error locator root finding (by far the most expensive step)
+ *
+ * In this implementation, step c is not performed using the usual Chien
search.
+ * Instead, an alternative approach described in [1] is used. It consists in
+ * factoring the error locator polynomial using the Berlekamp Trace algorithm
+ * (BTA) down to a certain degree (4), after which ad hoc low-degree polynomial
+ * solving techniques [2] are used. The resulting algorithm, called BTZ, yields
+ * much better performance than Chien search for usual (m,t) values (typically
+ * m >= 13, t < 32, see [1]).
+ *
+ * [1] B. Biswas, V. Herbert. Efficient root finding of polynomials over fields
+ * of characteristic 2, in: Western European Workshop on Research in Cryptology
+ * - WEWoRC 2009, Graz, Austria, LNCS, Springer, July 2009, to appear.
+ * [2] [Zin96] V.A. Zinoviev. On the solution of equations of degree 10 over
+ * finite fields GF(2^q). In Rapport de recherche INRIA no 2829, 1996.
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <linux/kernel.h>
What's this include for? It breaks compilation for OSX
(https://travis-ci.org/n1tehawk/sunxi-tools/jobs/133998103)
+#include <linux/errno.h>
Same as above. Should be replaced by a generic "#include <errno.h>".
+#include <asm/byteorder.h>
+#include <endian.h>
Again not available on OSX
(https://travis-ci.org/n1tehawk/sunxi-tools/jobs/134007716
and https://travis-ci.org/n1tehawk/sunxi-tools/jobs/134013177)
You might want to have a look at the portable_endian.h available in our
include/
subdir. Substituting '#include "portable_endian.h"' here seems to work fine.
+#include <getopt.h>
+
+#if defined(CONFIG_BCH_CONST_PARAMS)
+#define GF_M(_p) (CONFIG_BCH_CONST_M)
+#define GF_T(_p) (CONFIG_BCH_CONST_T)
+#define GF_N(_p) ((1 << (CONFIG_BCH_CONST_M))-1)
+#else
+#define GF_M(_p) ((_p)->m)
+#define GF_T(_p) ((_p)->t)
+#define GF_N(_p) ((_p)->n)
+#endif
+
+#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
+
+#define BCH_ECC_WORDS(_p) DIV_ROUND_UP(GF_M(_p)*GF_T(_p), 32)
+#define BCH_ECC_BYTES(_p) DIV_ROUND_UP(GF_M(_p)*GF_T(_p), 8)
+
+#ifndef dbg
+#define dbg(_fmt, args...) do {} while (0)
+#endif
+
+#define cpu_to_be32 htobe32
+#define kfree free
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+#define BCH_PRIMITIVE_POLY 0x5803
+
+struct image_info {
+ int ecc_strength;
+ int ecc_step_size;
+ int page_size;
+ int oob_size;
+ int usable_page_size;
+ int eraseblock_size;
+ int scramble;
+ int boot0;
+ loff_t offset;
loff_t is gcc-specific(?), and once again breaks on OSX:
https://travis-ci.org/n1tehawk/sunxi-tools/jobs/134014262
Is there a reason why the standard "off_t" is insufficient here?
+ const char *source;
+ const char *dest;
+};
+
+/**
+ * struct bch_control - BCH control structure
+ * @m: Galois field order
+ * @n: maximum codeword size in bits (= 2^m-1)
+ * @t: error correction capability in bits
+ * @ecc_bits: ecc exact size in bits, i.e. generator polynomial degree
(<=m*t)
+ * @ecc_bytes: ecc max size (m*t bits) in bytes
+ * @a_pow_tab: Galois field GF(2^m) exponentiation lookup table
+ * @a_log_tab: Galois field GF(2^m) log lookup table
+ * @mod8_tab: remainder generator polynomial lookup tables
+ * @ecc_buf: ecc parity words buffer
+ * @ecc_buf2: ecc parity words buffer
+ * @xi_tab: GF(2^m) base for solving degree 2 polynomial roots
+ * @syn: syndrome buffer
+ * @cache: log-based polynomial representation buffer
+ * @elp: error locator polynomial
+ * @poly_2t: temporary polynomials of degree 2t
+ */
+struct bch_control {
+ unsigned int m;
+ unsigned int n;
+ unsigned int t;
+ unsigned int ecc_bits;
+ unsigned int ecc_bytes;
+/* private: */
+ uint16_t *a_pow_tab;
+ uint16_t *a_log_tab;
+ uint32_t *mod8_tab;
+ uint32_t *ecc_buf;
+ uint32_t *ecc_buf2;
+ unsigned int *xi_tab;
+ unsigned int *syn;
+ int *cache;
+ struct gf_poly *elp;
+ struct gf_poly *poly_2t[4];
+};
+
+static int fls(int x)
+{
+ int r = 32;
+
+ if (!x)
+ return 0;
+ if (!(x & 0xffff0000u)) {
+ x <<= 16;
+ r -= 16;
+ }
+ if (!(x & 0xff000000u)) {
+ x <<= 8;
+ r -= 8;
+ }
+ if (!(x & 0xf0000000u)) {
+ x <<= 4;
+ r -= 4;
+ }
+ if (!(x & 0xc0000000u)) {
+ x <<= 2;
+ r -= 2;
+ }
+ if (!(x & 0x80000000u)) {
+ x <<= 1;
+ r -= 1;
+ }
+ return r;
+}
+
+/*
+ * represent a polynomial over GF(2^m)
+ */
+struct gf_poly {
+ unsigned int deg; /* polynomial degree */
+ unsigned int c[0]; /* polynomial terms */
+};
+
+/* given its degree, compute a polynomial size in bytes */
+#define GF_POLY_SZ(_d) (sizeof(struct gf_poly)+((_d)+1)*sizeof(unsigned int))
+
+/* polynomial of degree 1 */
+struct gf_poly_deg1 {
+ struct gf_poly poly;
+ unsigned int c[2];
+};
+
+/*
+ * same as encode_bch(), but process input data one byte at a time
+ */
+static void encode_bch_unaligned(struct bch_control *bch,
+ const unsigned char *data, unsigned int len,
+ uint32_t *ecc)
+{
+ int i;
+ const uint32_t *p;
+ const int l = BCH_ECC_WORDS(bch)-1;
+
+ while (len--) {
+ p = bch->mod8_tab + (l+1)*(((ecc[0] >> 24)^(*data++)) & 0xff);
+
+ for (i = 0; i < l; i++)
+ ecc[i] = ((ecc[i] << 8)|(ecc[i+1] >> 24))^(*p++);
+
+ ecc[l] = (ecc[l] << 8)^(*p);
+ }
+}
+
+/*
+ * convert ecc bytes to aligned, zero-padded 32-bit ecc words
+ */
+static void load_ecc8(struct bch_control *bch, uint32_t *dst,
+ const uint8_t *src)
+{
+ uint8_t pad[4] = {0, 0, 0, 0};
+ unsigned int i, nwords = BCH_ECC_WORDS(bch)-1;
+
+ for (i = 0; i < nwords; i++, src += 4)
+ dst[i] = (src[0] << 24)|(src[1] << 16)|(src[2] << 8)|src[3];
+
+ memcpy(pad, src, BCH_ECC_BYTES(bch)-4*nwords);
+ dst[nwords] = (pad[0] << 24)|(pad[1] << 16)|(pad[2] << 8)|pad[3];
+}
+
+/*
+ * convert 32-bit ecc words to ecc bytes
+ */
+static void store_ecc8(struct bch_control *bch, uint8_t *dst,
+ const uint32_t *src)
+{
+ uint8_t pad[4];
+ unsigned int i, nwords = BCH_ECC_WORDS(bch)-1;
+
+ for (i = 0; i < nwords; i++) {
+ *dst++ = (src[i] >> 24);
+ *dst++ = (src[i] >> 16) & 0xff;
+ *dst++ = (src[i] >> 8) & 0xff;
+ *dst++ = (src[i] >> 0) & 0xff;
+ }
+ pad[0] = (src[nwords] >> 24);
+ pad[1] = (src[nwords] >> 16) & 0xff;
+ pad[2] = (src[nwords] >> 8) & 0xff;
+ pad[3] = (src[nwords] >> 0) & 0xff;
+ memcpy(dst, pad, BCH_ECC_BYTES(bch)-4*nwords);
+}
+
+/**
+ * encode_bch - calculate BCH ecc parity of data
+ * @bch: BCH control structure
+ * @data: data to encode
+ * @len: data length in bytes
+ * @ecc: ecc parity data, must be initialized by caller
+ *
+ * The @ecc parity array is used both as input and output parameter, in order
to
+ * allow incremental computations. It should be of the size indicated by member
+ * @ecc_bytes of @bch, and should be initialized to 0 before the first call.
+ *
+ * The exact number of computed ecc parity bits is given by member @ecc_bits of
+ * @bch; it may be less than m*t for large values of t.
+ */
+static void encode_bch(struct bch_control *bch, const uint8_t *data,
+ unsigned int len, uint8_t *ecc)
+{
+ const unsigned int l = BCH_ECC_WORDS(bch)-1;
+ unsigned int i, mlen;
+ unsigned long m;
+ uint32_t w, r[l+1];
+ const uint32_t * const tab0 = bch->mod8_tab;
+ const uint32_t * const tab1 = tab0 + 256*(l+1);
+ const uint32_t * const tab2 = tab1 + 256*(l+1);
+ const uint32_t * const tab3 = tab2 + 256*(l+1);
+ const uint32_t *pdata, *p0, *p1, *p2, *p3;
+
+ if (ecc) {
+ /* load ecc parity bytes into internal 32-bit buffer */
+ load_ecc8(bch, bch->ecc_buf, ecc);
+ } else {
+ memset(bch->ecc_buf, 0, sizeof(r));
+ }
+
+ /* process first unaligned data bytes */
+ m = ((unsigned long)data) & 3;
+ if (m) {
+ mlen = (len < (4-m)) ? len : 4-m;
+ encode_bch_unaligned(bch, data, mlen, bch->ecc_buf);
+ data += mlen;
+ len -= mlen;
+ }
+
+ /* process 32-bit aligned data words */
+ pdata = (uint32_t *)data;
+ mlen = len/4;
+ data += 4*mlen;
+ len -= 4*mlen;
+ memcpy(r, bch->ecc_buf, sizeof(r));
+
+ /*
+ * split each 32-bit word into 4 polynomials of weight 8 as follows:
+ *
+ * 31 ...24 23 ...16 15 ... 8 7 ... 0
+ * xxxxxxxx yyyyyyyy zzzzzzzz tttttttt
+ * tttttttt mod g = r0 (precomputed)
+ * zzzzzzzz 00000000 mod g = r1 (precomputed)
+ * yyyyyyyy 00000000 00000000 mod g = r2 (precomputed)
+ * xxxxxxxx 00000000 00000000 00000000 mod g = r3 (precomputed)
+ * xxxxxxxx yyyyyyyy zzzzzzzz tttttttt mod g = r0^r1^r2^r3
+ */
+ while (mlen--) {
+ /* input data is read in big-endian format */
+ w = r[0]^cpu_to_be32(*pdata++);
+ p0 = tab0 + (l+1)*((w >> 0) & 0xff);
+ p1 = tab1 + (l+1)*((w >> 8) & 0xff);
+ p2 = tab2 + (l+1)*((w >> 16) & 0xff);
+ p3 = tab3 + (l+1)*((w >> 24) & 0xff);
+
+ for (i = 0; i < l; i++)
+ r[i] = r[i+1]^p0[i]^p1[i]^p2[i]^p3[i];
+
+ r[l] = p0[l]^p1[l]^p2[l]^p3[l];
+ }
+ memcpy(bch->ecc_buf, r, sizeof(r));
+
+ /* process last unaligned bytes */
+ if (len)
+ encode_bch_unaligned(bch, data, len, bch->ecc_buf);
+
+ /* store ecc parity bytes into original parity buffer */
+ if (ecc)
+ store_ecc8(bch, ecc, bch->ecc_buf);
+}
+
+static inline int modulo(struct bch_control *bch, unsigned int v)
+{
+ const unsigned int n = GF_N(bch);
+ while (v >= n) {
+ v -= n;
+ v = (v & n) + (v >> GF_M(bch));
+ }
+ return v;
+}
+
+/*
+ * shorter and faster modulo function, only works when v < 2N.
+ */
+static inline int mod_s(struct bch_control *bch, unsigned int v)
+{
+ const unsigned int n = GF_N(bch);
+ return (v < n) ? v : v-n;
+}
+
+static inline int deg(unsigned int poly)
+{
+ /* polynomial degree is the most-significant bit index */
+ return fls(poly)-1;
+}
+
+static inline int parity(unsigned int x)
+{
+ /*
+ * public domain code snippet, lifted from
+ * http://www-graphics.stanford.edu/~seander/bithacks.html
+ */
+ x ^= x >> 1;
+ x ^= x >> 2;
+ x = (x & 0x11111111U) * 0x11111111U;
+ return (x >> 28) & 1;
+}
Function parity() is unused, which makes clang unhappy:
https://travis-ci.org/n1tehawk/sunxi-tools/jobs/133998102
If the code is supposed to remain, e.g. for clarity's sake / reference,
I suggest enclosing it with "#if 0" [...] "#endif".
+
+/* Galois field basic operations: multiply, divide, inverse, etc. */
+
+static inline unsigned int gf_mul(struct bch_control *bch, unsigned int a,
+ unsigned int b)
+{
+ return (a && b) ? bch->a_pow_tab[mod_s(bch, bch->a_log_tab[a]+
+ bch->a_log_tab[b])] : 0;
+}
+
+static inline unsigned int gf_sqr(struct bch_control *bch, unsigned int a)
+{
+ return a ? bch->a_pow_tab[mod_s(bch, 2*bch->a_log_tab[a])] : 0;
+}
+
+static inline unsigned int gf_div(struct bch_control *bch, unsigned int a,
+ unsigned int b)
+{
+ return a ? bch->a_pow_tab[mod_s(bch, bch->a_log_tab[a]+
+ GF_N(bch)-bch->a_log_tab[b])] : 0;
+}
Function gf_div() is unused, see above.
+
+static inline unsigned int gf_inv(struct bch_control *bch, unsigned int a)
+{
+ return bch->a_pow_tab[GF_N(bch)-bch->a_log_tab[a]];
+}
Function gf_inv() is unused, see above.
+
+static inline unsigned int a_pow(struct bch_control *bch, int i)
+{
+ return bch->a_pow_tab[modulo(bch, i)];
+}
+
+static inline int a_log(struct bch_control *bch, unsigned int x)
+{
+ return bch->a_log_tab[x];
+}
+
+static inline int a_ilog(struct bch_control *bch, unsigned int x)
+{
+ return mod_s(bch, GF_N(bch)-bch->a_log_tab[x]);
+}
Function a_ilog() is unused, see above.
+
+/*
+ * generate Galois field lookup tables
+ */
+static int build_gf_tables(struct bch_control *bch, unsigned int poly)
+{
+ unsigned int i, x = 1;
+ const unsigned int k = 1 << deg(poly);
+
+ /* primitive polynomial must be of degree m */
+ if (k != (1u << GF_M(bch)))
+ return -1;
+
+ for (i = 0; i < GF_N(bch); i++) {
+ bch->a_pow_tab[i] = x;
+ bch->a_log_tab[x] = i;
+ if (i && (x == 1))
+ /* polynomial is not primitive (a^i=1 with 0<i<2^m-1) */
+ return -1;
+ x <<= 1;
+ if (x & k)
+ x ^= poly;
+ }
+ bch->a_pow_tab[GF_N(bch)] = 1;
+ bch->a_log_tab[0] = 0;
+
+ return 0;
+}
+
+/*
+ * compute generator polynomial remainder tables for fast encoding
+ */
+static void build_mod8_tables(struct bch_control *bch, const uint32_t *g)
+{
+ int i, j, b, d;
+ uint32_t data, hi, lo, *tab;
+ const int l = BCH_ECC_WORDS(bch);
+ const int plen = DIV_ROUND_UP(bch->ecc_bits+1, 32);
+ const int ecclen = DIV_ROUND_UP(bch->ecc_bits, 32);
+
+ memset(bch->mod8_tab, 0, 4*256*l*sizeof(*bch->mod8_tab));
+
+ for (i = 0; i < 256; i++) {
+ /* p(X)=i is a small polynomial of weight <= 8 */
+ for (b = 0; b < 4; b++) {
+ /* we want to compute (p(X).X^(8*b+deg(g))) mod g(X) */
+ tab = bch->mod8_tab + (b*256+i)*l;
+ data = i << (8*b);
+ while (data) {
+ d = deg(data);
+ /* subtract X^d.g(X) from p(X).X^(8*b+deg(g)) */
+ data ^= g[0] >> (31-d);
+ for (j = 0; j < ecclen; j++) {
+ hi = (d < 31) ? g[j] << (d+1) : 0;
+ lo = (j+1 < plen) ?
+ g[j+1] >> (31-d) : 0;
+ tab[j] ^= hi|lo;
+ }
+ }
+ }
+ }
+}
+
+/*
+ * build a base for factoring degree 2 polynomials
+ */
+static int build_deg2_base(struct bch_control *bch)
+{
+ const int m = GF_M(bch);
+ int i, j, r;
+ unsigned int sum, x, y, remaining, ak = 0, xi[m];
+
+ /* find k s.t. Tr(a^k) = 1 and 0 <= k < m */
+ for (i = 0; i < m; i++) {
+ for (j = 0, sum = 0; j < m; j++)
+ sum ^= a_pow(bch, i*(1 << j));
+
+ if (sum) {
+ ak = bch->a_pow_tab[i];
+ break;
+ }
+ }
+ /* find xi, i=0..m-1 such that xi^2+xi = a^i+Tr(a^i).a^k */
+ remaining = m;
+ memset(xi, 0, sizeof(xi));
+
+ for (x = 0; (x <= GF_N(bch)) && remaining; x++) {
+ y = gf_sqr(bch, x)^x;
+ for (i = 0; i < 2; i++) {
+ r = a_log(bch, y);
+ if (y && (r < m) && !xi[r]) {
+ bch->xi_tab[r] = x;
+ xi[r] = 1;
+ remaining--;
+ dbg("x%d = %x\n", r, x);
+ break;
+ }
+ y ^= ak;
+ }
+ }
+ /* should not happen but check anyway */
+ return remaining ? -1 : 0;
+}
+
+static void *bch_alloc(size_t size, int *err)
+{
+ void *ptr;
+
+ ptr = malloc(size);
+ if (ptr == NULL)
+ *err = 1;
+ return ptr;
+}
+
+/*
+ * compute generator polynomial for given (m,t) parameters.
+ */
+static uint32_t *compute_generator_polynomial(struct bch_control *bch)
+{
+ const unsigned int m = GF_M(bch);
+ const unsigned int t = GF_T(bch);
+ int n, err = 0;
+ unsigned int i, j, nbits, r, word, *roots;
+ struct gf_poly *g;
+ uint32_t *genpoly;
+
+ g = bch_alloc(GF_POLY_SZ(m*t), &err);
+ roots = bch_alloc((bch->n+1)*sizeof(*roots), &err);
+ genpoly = bch_alloc(DIV_ROUND_UP(m*t+1, 32)*sizeof(*genpoly), &err);
+
+ if (err) {
+ kfree(genpoly);
+ genpoly = NULL;
+ goto finish;
+ }
+
+ /* enumerate all roots of g(X) */
+ memset(roots , 0, (bch->n+1)*sizeof(*roots));
+ for (i = 0; i < t; i++) {
+ for (j = 0, r = 2*i+1; j < m; j++) {
+ roots[r] = 1;
+ r = mod_s(bch, 2*r);
+ }
+ }
+ /* build generator polynomial g(X) */
+ g->deg = 0;
+ g->c[0] = 1;
+ for (i = 0; i < GF_N(bch); i++) {
+ if (roots[i]) {
+ /* multiply g(X) by (X+root) */
+ r = bch->a_pow_tab[i];
+ g->c[g->deg+1] = 1;
+ for (j = g->deg; j > 0; j--)
+ g->c[j] = gf_mul(bch, g->c[j], r)^g->c[j-1];
+
+ g->c[0] = gf_mul(bch, g->c[0], r);
+ g->deg++;
+ }
+ }
+ /* store left-justified binary representation of g(X) */
+ n = g->deg+1;
+ i = 0;
+
+ while (n > 0) {
+ nbits = (n > 32) ? 32 : n;
+ for (j = 0, word = 0; j < nbits; j++) {
+ if (g->c[n-1-j])
+ word |= 1u << (31-j);
+ }
+ genpoly[i++] = word;
+ n -= nbits;
+ }
+ bch->ecc_bits = g->deg;
+
+finish:
+ kfree(g);
+ kfree(roots);
+
+ return genpoly;
+}
+
+/**
+ * free_bch - free the BCH control structure
+ * @bch: BCH control structure to release
+ */
+static void free_bch(struct bch_control *bch)
+{
+ unsigned int i;
+
+ if (bch) {
+ kfree(bch->a_pow_tab);
+ kfree(bch->a_log_tab);
+ kfree(bch->mod8_tab);
+ kfree(bch->ecc_buf);
+ kfree(bch->ecc_buf2);
+ kfree(bch->xi_tab);
+ kfree(bch->syn);
+ kfree(bch->cache);
+ kfree(bch->elp);
+
+ for (i = 0; i < ARRAY_SIZE(bch->poly_2t); i++)
+ kfree(bch->poly_2t[i]);
+
+ kfree(bch);
+ }
+}
+
+/**
+ * init_bch - initialize a BCH encoder/decoder
+ * @m: Galois field order, should be in the range 5-15
+ * @t: maximum error correction capability, in bits
+ * @prim_poly: user-provided primitive polynomial (or 0 to use default)
+ *
+ * Returns:
+ * a newly allocated BCH control structure if successful, NULL otherwise
+ *
+ * This initialization can take some time, as lookup tables are built for fast
+ * encoding/decoding; make sure not to call this function from a time critical
+ * path. Usually, init_bch() should be called on module/driver init and
+ * free_bch() should be called to release memory on exit.
+ *
+ * You may provide your own primitive polynomial of degree @m in argument
+ * @prim_poly, or let init_bch() use its default polynomial.
+ *
+ * Once init_bch() has successfully returned a pointer to a newly allocated
+ * BCH control structure, ecc length in bytes is given by member @ecc_bytes of
+ * the structure.
+ */
+static struct bch_control *init_bch(int m, int t, unsigned int prim_poly)
+{
+ int err = 0;
+ unsigned int i, words;
+ uint32_t *genpoly;
+ struct bch_control *bch = NULL;
+
+ const int min_m = 5;
+ const int max_m = 15;
+
+ /* default primitive polynomials */
+ static const unsigned int prim_poly_tab[] = {
+ 0x25, 0x43, 0x83, 0x11d, 0x211, 0x409, 0x805, 0x1053, 0x201b,
+ 0x402b, 0x8003,
+ };
+
+#if defined(CONFIG_BCH_CONST_PARAMS)
+ if ((m != (CONFIG_BCH_CONST_M)) || (t != (CONFIG_BCH_CONST_T))) {
+ printk(KERN_ERR "bch encoder/decoder was configured to support "
+ "parameters m=%d, t=%d only!\n",
+ CONFIG_BCH_CONST_M, CONFIG_BCH_CONST_T);
+ goto fail;
+ }
+#endif
+ if ((m < min_m) || (m > max_m))
+ /*
+ * values of m greater than 15 are not currently supported;
+ * supporting m > 15 would require changing table base type
+ * (uint16_t) and a small patch in matrix transposition
+ */
+ goto fail;
+
+ /* sanity checks */
+ if ((t < 1) || (m*t >= ((1 << m)-1)))
+ /* invalid t value */
+ goto fail;
+
+ /* select a primitive polynomial for generating GF(2^m) */
+ if (prim_poly == 0)
+ prim_poly = prim_poly_tab[m-min_m];
+
+ bch = malloc(sizeof(*bch));
+ if (bch == NULL)
+ goto fail;
+
+ memset(bch, 0, sizeof(*bch));
+
+ bch->m = m;
+ bch->t = t;
+ bch->n = (1 << m)-1;
+ words = DIV_ROUND_UP(m*t, 32);
+ bch->ecc_bytes = DIV_ROUND_UP(m*t, 8);
+ bch->a_pow_tab = bch_alloc((1+bch->n)*sizeof(*bch->a_pow_tab), &err);
+ bch->a_log_tab = bch_alloc((1+bch->n)*sizeof(*bch->a_log_tab), &err);
+ bch->mod8_tab = bch_alloc(words*1024*sizeof(*bch->mod8_tab), &err);
+ bch->ecc_buf = bch_alloc(words*sizeof(*bch->ecc_buf), &err);
+ bch->ecc_buf2 = bch_alloc(words*sizeof(*bch->ecc_buf2), &err);
+ bch->xi_tab = bch_alloc(m*sizeof(*bch->xi_tab), &err);
+ bch->syn = bch_alloc(2*t*sizeof(*bch->syn), &err);
+ bch->cache = bch_alloc(2*t*sizeof(*bch->cache), &err);
+ bch->elp = bch_alloc((t+1)*sizeof(struct gf_poly_deg1), &err);
+
+ for (i = 0; i < ARRAY_SIZE(bch->poly_2t); i++)
+ bch->poly_2t[i] = bch_alloc(GF_POLY_SZ(2*t), &err);
+
+ if (err)
+ goto fail;
+
+ err = build_gf_tables(bch, prim_poly);
+ if (err)
+ goto fail;
+
+ /* use generator polynomial for computing encoding tables */
+ genpoly = compute_generator_polynomial(bch);
+ if (genpoly == NULL)
+ goto fail;
+
+ build_mod8_tables(bch, genpoly);
+ kfree(genpoly);
+
+ err = build_deg2_base(bch);
+ if (err)
+ goto fail;
+
+ return bch;
+
+fail:
+ free_bch(bch);
+ return NULL;
+}
+
+static void swap_bits(uint8_t *buf, int len)
+{
+ int i, j;
+
+ for (j = 0; j < len; j++) {
+ uint8_t byte = buf[j];
+
+ buf[j] = 0;
+ for (i = 0; i < 8; i++) {
+ if (byte & (1 << i))
+ buf[j] |= (1 << (7 - i));
+ }
+ }
+}
+
+static uint16_t lfsr_step(uint16_t state, int count)
+{
+ state &= 0x7fff;
+ while (count--)
+ state = ((state >> 1) |
+ ((((state >> 0) ^ (state >> 1)) & 1) << 14)) & 0x7fff;
+
+ return state;
+}
+
+static uint16_t default_scrambler_seeds[] = {
+ 0x2b75, 0x0bd0, 0x5ca3, 0x62d1, 0x1c93, 0x07e9, 0x2162, 0x3a72,
+ 0x0d67, 0x67f9, 0x1be7, 0x077d, 0x032f, 0x0dac, 0x2716, 0x2436,
+ 0x7922, 0x1510, 0x3860, 0x5287, 0x480f, 0x4252, 0x1789, 0x5a2d,
+ 0x2a49, 0x5e10, 0x437f, 0x4b4e, 0x2f45, 0x216e, 0x5cb7, 0x7130,
+ 0x2a3f, 0x60e4, 0x4dc9, 0x0ef0, 0x0f52, 0x1bb9, 0x6211, 0x7a56,
+ 0x226d, 0x4ea7, 0x6f36, 0x3692, 0x38bf, 0x0c62, 0x05eb, 0x4c55,
+ 0x60f4, 0x728c, 0x3b6f, 0x2037, 0x7f69, 0x0936, 0x651a, 0x4ceb,
+ 0x6218, 0x79f3, 0x383f, 0x18d9, 0x4f05, 0x5c82, 0x2912, 0x6f17,
+ 0x6856, 0x5938, 0x1007, 0x61ab, 0x3e7f, 0x57c2, 0x542f, 0x4f62,
+ 0x7454, 0x2eac, 0x7739, 0x42d4, 0x2f90, 0x435a, 0x2e52, 0x2064,
+ 0x637c, 0x66ad, 0x2c90, 0x0bad, 0x759c, 0x0029, 0x0986, 0x7126,
+ 0x1ca7, 0x1605, 0x386a, 0x27f5, 0x1380, 0x6d75, 0x24c3, 0x0f8e,
+ 0x2b7a, 0x1418, 0x1fd1, 0x7dc1, 0x2d8e, 0x43af, 0x2267, 0x7da3,
+ 0x4e3d, 0x1338, 0x50db, 0x454d, 0x764d, 0x40a3, 0x42e6, 0x262b,
+ 0x2d2e, 0x1aea, 0x2e17, 0x173d, 0x3a6e, 0x71bf, 0x25f9, 0x0a5d,
+ 0x7c57, 0x0fbe, 0x46ce, 0x4939, 0x6b17, 0x37bb, 0x3e91, 0x76db,
+};
+
+static uint16_t brom_scrambler_seeds[] = { 0x4a80 };
+
+static void scramble(const struct image_info *info,
+ int page, uint8_t *data, int datalen)
+{
+ uint16_t state;
+ int i;
+
+ /* Boot0 is always scrambled no matter the command line option. */
+ if (info->boot0) {
+ state = brom_scrambler_seeds[0];
+ } else {
+ unsigned seedmod = info->eraseblock_size / info->page_size;
+
+ /* Bail out earlier if the user didn't ask for scrambling. */
+ if (!info->scramble)
+ return;
+
+ if (seedmod > ARRAY_SIZE(default_scrambler_seeds))
+ seedmod = ARRAY_SIZE(default_scrambler_seeds);
+
+ state = default_scrambler_seeds[page % seedmod];
+ }
+
+ /* Prepare the initial state... */
+ state = lfsr_step(state, 15);
+
+ /* and start scrambling data. */
+ for (i = 0; i < datalen; i++) {
+ data[i] ^= state;
+ state = lfsr_step(state, 8);
+ }
+}
+
+static int write_page(const struct image_info *info, uint8_t *buffer,
+ FILE *src, FILE *rnd, FILE *dst,
+ struct bch_control *bch, int page)
+{
+ int steps = info->usable_page_size / info->ecc_step_size;
+ int eccbytes = DIV_ROUND_UP(info->ecc_strength * 14, 8);
+ loff_t pos = ftell(dst);
loff_t - see above
+ size_t pad, cnt;
+ int i;
+
+ if (eccbytes % 2)
+ eccbytes++;
+
+ memset(buffer, 0xff, info->page_size + info->oob_size);
+ cnt = fread(buffer, 1, info->usable_page_size, src);
+ if (!cnt) {
+ if (!feof(src)) {
+ fprintf(stderr,
+ "Failed to read data from the source\n");
+ return -1;
+ } else {
+ return 0;
+ }
+ }
+
+ fwrite(buffer, info->page_size + info->oob_size, 1, dst);
+
+ for (i = 0; i < info->usable_page_size; i++) {
+ if (buffer[i] != 0xff)
+ break;
+ }
+
+ /* We leave empty pages at 0xff. */
+ if (i == info->usable_page_size)
+ return 0;
+
+ /* Restore the source pointer to read it again. */
+ fseek(src, -cnt, SEEK_CUR);
+
+ /* Randomize unused space if scrambling is required. */
+ if (info->scramble) {
+ int offs;
+
+ if (info->boot0) {
+ offs = steps * (info->ecc_step_size + eccbytes + 4);
+ cnt = info->page_size + info->oob_size - offs;
+ fread(buffer + offs, 1, cnt, rnd);
+ } else {
+ offs = info->page_size + (steps * (eccbytes + 4));
+ cnt = info->page_size + info->oob_size - offs;
+ memset(buffer + offs, 0xff, cnt);
+ scramble(info, page, buffer + offs, cnt);
+ }
+ fseek(dst, pos + offs, SEEK_SET);
+ fwrite(buffer + offs, cnt, 1, dst);
+ }
+
+ for (i = 0; i < steps; i++) {
+ int ecc_offs, data_offs;
+ uint8_t *ecc;
+
+ memset(buffer, 0xff, info->ecc_step_size + eccbytes + 4);
+ ecc = buffer + info->ecc_step_size + 4;
+ if (info->boot0) {
+ data_offs = i * (info->ecc_step_size + eccbytes + 4);
+ ecc_offs = data_offs + info->ecc_step_size + 4;
+ } else {
+ data_offs = i * info->ecc_step_size;
+ ecc_offs = info->page_size + 4 + (i * (eccbytes + 4));
+ }
+
+ cnt = fread(buffer, 1, info->ecc_step_size, src);
+ if (!cnt && !feof(src)) {
+ fprintf(stderr,
+ "Failed to read data from the source\n");
+ return -1;
+ }
+
+ pad = info->ecc_step_size - cnt;
+ if (pad) {
+ if (info->scramble && info->boot0)
+ fread(buffer + cnt, 1, pad, rnd);
+ else
+ memset(buffer + cnt, 0xff, pad);
+ }
+
+ memset(ecc, 0, eccbytes);
+ swap_bits(buffer, info->ecc_step_size + 4);
+ encode_bch(bch, buffer, info->ecc_step_size + 4, ecc);
+ swap_bits(buffer, info->ecc_step_size + 4);
+ swap_bits(ecc, eccbytes);
+ scramble(info, page, buffer, info->ecc_step_size + 4 +
eccbytes);
+
+ fseek(dst, pos + data_offs, SEEK_SET);
+ fwrite(buffer, info->ecc_step_size, 1, dst);
+ fseek(dst, pos + ecc_offs - 4, SEEK_SET);
+ fwrite(ecc - 4, eccbytes + 4, 1, dst);
+ }
+
+ /* Fix BBM. */
+ fseek(dst, pos + info->page_size, SEEK_SET);
+ memset(buffer, 0xff, 2);
+ fwrite(buffer, 2, 1, dst);
+
+ /* Make dst pointer point to the next page. */
+ fseek(dst, pos + info->page_size + info->oob_size, SEEK_SET);
+
+ return 0;
+}
+
+static int create_image(const struct image_info *info)
+{
+ loff_t page = info->offset / info->page_size;
loff_t, see above
+ struct bch_control *bch;
+ FILE *src, *dst, *rnd;
+ uint8_t *buffer;
+
+ bch = init_bch(14, info->ecc_strength, BCH_PRIMITIVE_POLY);
+ if (!bch) {
+ fprintf(stderr, "Failed to init the BCH engine\n");
+ return -1;
+ }
+
+ buffer = malloc(info->page_size + info->oob_size);
+ if (!buffer) {
+ fprintf(stderr, "Failed to allocate the NAND page buffer\n");
+ return -1;
+ }
+
+ memset(buffer, 0xff, info->page_size + info->oob_size);
+
+ src = fopen(info->source, "r");
+ if (!src) {
+ fprintf(stderr, "Failed to open source file (%s)\n",
+ info->source);
+ return -1;
+ }
+
+ dst = fopen(info->dest, "w");
+ if (!dst) {
+ fprintf(stderr, "Failed to open dest file (%s)\n", info->dest);
+ return -1;
+ }
+
+ rnd = fopen("/dev/urandom", "r");
+ if (!rnd) {
+ fprintf(stderr, "Failed to open /dev/urandom\n");
+ return -1;
+ }
+
+ while (!feof(src)) {
+ int ret;
+
+ ret = write_page(info, buffer, src, rnd, dst, bch, page++);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static void display_help(int status)
+{
+ fprintf(status == EXIT_SUCCESS ? stdout : stderr,
+ "Usage: sunxi-nand-image-builder [OPTIONS] source-image
output-image\n"
+ "Creates a raw NAND image that can be read by the sunxi NAND
controller.\n"
+ "\n"
+ "-h --help Display
this help and exit\n"
+ "-c <strength>/<step> --ecc=<strength>/<step> ECC
config\n"
+ " Valid strengths:
16, 24, 28, 32, 40, 48, 56, 60 and 64\n"
+ " Valid steps: 512
and 1024\n"
+ "-p <size> --page-size=<size> Page
size\n"
+ "-o <size> --oob-size=<size> OOB size\n"
+ "-u <size> --usable-page-size=<size> Usable page size.
Only needed for boot0 mode\n"
+ "-e <size> --eraseblock-size=<size> Erase block
size\n"
+ "-b --boot0 Build a
boot0 image.\n"
+ "-s --scramble Scramble
data\n"
+ "-a <offset> --address Where the image
will be programmed.\n"
+ " This option is
only required for non boot0 images that are meant to be programmed at a non eraseblock
aligned offset.\n"
+ "\n");
+ exit(status);
+}
+
+static int check_image_info(struct image_info *info)
+{
+ static int valid_ecc_strengths[] = { 16, 24, 28, 32, 40, 48, 56, 60, 64
};
+ int eccbytes, eccsteps;
+ unsigned i;
+
+ if (!info->page_size || !info->oob_size || !info->eraseblock_size ||
+ !info->usable_page_size)
+ return -EINVAL;
+
+ if (info->ecc_step_size != 512 && info->ecc_step_size != 1024)
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(valid_ecc_strengths); i++) {
+ if (valid_ecc_strengths[i] == info->ecc_strength)
+ break;
+ }
+
+ if (i == ARRAY_SIZE(valid_ecc_strengths))
+ return -EINVAL;
+
+ eccbytes = DIV_ROUND_UP(info->ecc_strength * 14, 8);
+ if (eccbytes % 2)
+ eccbytes++;
+ eccbytes += 4;
+
+ eccsteps = info->usable_page_size / info->ecc_step_size;
+
+ if (info->page_size + info->oob_size <
+ info->usable_page_size + (eccsteps * (eccbytes)))
+ return -EINVAL;
+
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ struct image_info info;
+
+ memset(&info, 0, sizeof(info));
+ /*
+ * Process user arguments
+ */
+ for (;;) {
+ int option_index = 0;
+ char *endptr = NULL;
+ static const struct option long_options[] = {
+ {"help", no_argument, 0, 0},
+ {"ecc", required_argument, 0, 'c'},
+ {"page-size", required_argument, 0, 'p'},
+ {"oob-size", required_argument, 0, 'o'},
+ {"usable-page-size", required_argument, 0, 'u'},
+ {"eraseblock-size", required_argument, 0, 'e'},
+ {"boot0", no_argument, 0, 'b'},
+ {"scramble", no_argument, 0, 's'},
+ {"address", required_argument, 0, 'a'},
+ {0, 0, 0, 0},
+ };
+
+ int c = getopt_long(argc, argv, "c:p:o:u:e:ba:s",
+ long_options, &option_index);
+ if (c == EOF)
+ break;
+
+ switch (c) {
+ case 'h':
+ display_help(0);
+ break;
+ case 's':
+ info.scramble = 1;
+ break;
+ case 'c':
+ info.ecc_strength = strtol(optarg, &endptr, 0);
+ if (endptr || *endptr == '/')
+ info.ecc_step_size = strtol(endptr + 1, NULL,
0);
+ break;
+ case 'p':
+ info.page_size = strtol(optarg, NULL, 0);
+ break;
+ case 'o':
+ info.oob_size = strtol(optarg, NULL, 0);
+ break;
+ case 'u':
+ info.usable_page_size = strtol(optarg, NULL, 0);
+ break;
+ case 'e':
+ info.eraseblock_size = strtol(optarg, NULL, 0);
+ break;
+ case 'b':
+ info.boot0 = 1;
+ break;
+ case 'a':
+ info.offset = strtoull(optarg, NULL, 0);
+ break;
+ case '?':
+ display_help(-1);
+ break;
+ }
+ }
+
+ if ((argc - optind) != 2)
+ display_help(-1);
+
+ info.source = argv[optind];
+ info.dest = argv[optind + 1];
+
+ if (!info.boot0) {
+ info.usable_page_size = info.page_size;
+ } else if (!info.usable_page_size) {
+ if (info.page_size > 8192)
+ info.usable_page_size = 8192;
+ else if (info.page_size > 4096)
+ info.usable_page_size = 4096;
+ else
+ info.usable_page_size = 1024;
+ }
+
+ if (check_image_info(&info))
+ display_help(-1);
+
+ return create_image(&info);
+}
I have verified that with
https://github.com/n1tehawk/sunxi-tools/commit/4f71a411e0b28b8c737c0e2948b0676ea4c78e8a
applied, our build tests pass
(https://travis-ci.org/n1tehawk/sunxi-tools/builds/134018068).
Regards, B. Nortmann
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