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/*
* nandwrite and nanddump ported to busybox from mtd-utils
*
* Author: Baruch Siach <baruch@tkos.co.il>, Orex Computed Radiography
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*
* TODO: add support for large (>4GB) MTD devices
*/
//config:config NANDWRITE
//config: bool "nandwrite"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: Write to the specified MTD device, with bad blocks awareness
//config:
//config:config NANDDUMP
//config: bool "nanddump"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: Dump the content of raw NAND chip
//applet:IF_NANDWRITE(APPLET(nandwrite, BB_DIR_USR_SBIN, BB_SUID_DROP))
//applet:IF_NANDWRITE(APPLET_ODDNAME(nanddump, nandwrite, BB_DIR_USR_SBIN, BB_SUID_DROP, nanddump))
//kbuild:lib-$(CONFIG_NANDWRITE) += nandwrite.o
//kbuild:lib-$(CONFIG_NANDDUMP) += nandwrite.o
//usage:#define nandwrite_trivial_usage
//usage: "[-p] [-s ADDR] MTD_DEVICE [FILE]"
//usage:#define nandwrite_full_usage "\n\n"
//usage: "Write to the specified MTD device\n"
//usage: "\n -p Pad to page size"
//usage: "\n -s ADDR Start address"
//usage:#define nanddump_trivial_usage
//usage: "[-o] [-b] [-s ADDR] [-f FILE] MTD_DEVICE"
//usage:#define nanddump_full_usage "\n\n"
//usage: "Dump the specified MTD device\n"
//usage: "\n -o Omit oob data"
//usage: "\n -b Omit bad block from the dump"
//usage: "\n -s ADDR Start address"
//usage: "\n -l LEN Length"
//usage: "\n -f FILE Dump to file ('-' for stdout)"
#include "libbb.h"
#include <mtd/mtd-user.h>
#define IS_NANDDUMP (ENABLE_NANDDUMP && (!ENABLE_NANDWRITE || (applet_name[4] == 'd')))
#define IS_NANDWRITE (ENABLE_NANDWRITE && (!ENABLE_NANDDUMP || (applet_name[4] != 'd')))
#define OPT_p (1 << 0) /* nandwrite only */
#define OPT_o (1 << 0) /* nanddump only */
#define OPT_s (1 << 1)
#define OPT_b (1 << 2)
#define OPT_f (1 << 3)
#define OPT_l (1 << 4)
/* helper for writing out 0xff for bad blocks pad */
static void dump_bad(struct mtd_info_user *meminfo, unsigned len, int oob)
{
unsigned char buf[meminfo->writesize];
unsigned count;
/* round len to the next page */
len = (len | ~(meminfo->writesize - 1)) + 1;
memset(buf, 0xff, sizeof(buf));
for (count = 0; count < len; count += meminfo->writesize) {
xwrite(STDOUT_FILENO, buf, meminfo->writesize);
if (oob)
xwrite(STDOUT_FILENO, buf, meminfo->oobsize);
}
}
static unsigned next_good_eraseblock(int fd, struct mtd_info_user *meminfo,
unsigned block_offset)
{
while (1) {
loff_t offs;
if (block_offset >= meminfo->size) {
if (IS_NANDWRITE)
bb_error_msg_and_die("not enough space in MTD device");
return block_offset; /* let the caller exit */
}
offs = block_offset;
if (xioctl(fd, MEMGETBADBLOCK, &offs) == 0)
return block_offset;
/* ioctl returned 1 => "bad block" */
if (IS_NANDWRITE)
printf("Skipping bad block at 0x%08x\n", block_offset);
block_offset += meminfo->erasesize;
}
}
int nandwrite_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int nandwrite_main(int argc UNUSED_PARAM, char **argv)
{
/* Buffer for OOB data */
unsigned char *oobbuf;
unsigned opts;
int fd;
ssize_t cnt;
unsigned mtdoffset, meminfo_writesize, blockstart, limit;
unsigned end_addr = ~0;
struct mtd_info_user meminfo;
struct mtd_oob_buf oob;
unsigned char *filebuf;
const char *opt_s = "0", *opt_f = "-", *opt_l;
if (IS_NANDDUMP) {
opt_complementary = "=1";
opts = getopt32(argv, "os:bf:l:", &opt_s, &opt_f, &opt_l);
} else { /* nandwrite */
opt_complementary = "-1:?2";
opts = getopt32(argv, "ps:", &opt_s);
}
argv += optind;
if (IS_NANDWRITE && argv[1])
opt_f = argv[1];
if (!LONE_DASH(opt_f)) {
int tmp_fd = xopen(opt_f,
IS_NANDDUMP ? O_WRONLY | O_TRUNC | O_CREAT : O_RDONLY
);
xmove_fd(tmp_fd, IS_NANDDUMP ? STDOUT_FILENO : STDIN_FILENO);
}
fd = xopen(argv[0], IS_NANDWRITE ? O_RDWR : O_RDONLY);
xioctl(fd, MEMGETINFO, &meminfo);
mtdoffset = xstrtou(opt_s, 0);
if (IS_NANDDUMP && (opts & OPT_l)) {
unsigned length = xstrtou(opt_l, 0);
if (length < meminfo.size - mtdoffset)
end_addr = mtdoffset + length;
}
/* Pull it into a CPU register (hopefully) - smaller code that way */
meminfo_writesize = meminfo.writesize;
if (mtdoffset & (meminfo_writesize - 1))
bb_error_msg_and_die("start address is not page aligned");
filebuf = xmalloc(meminfo_writesize);
oobbuf = xmalloc(meminfo.oobsize);
oob.start = 0;
oob.length = meminfo.oobsize;
oob.ptr = oobbuf;
blockstart = mtdoffset & ~(meminfo.erasesize - 1);
if (blockstart != mtdoffset) {
unsigned tmp;
/* mtdoffset is in the middle of an erase block, verify that
* this block is OK. Advance mtdoffset only if this block is
* bad.
*/
tmp = next_good_eraseblock(fd, &meminfo, blockstart);
if (tmp != blockstart) {
/* bad block(s), advance mtdoffset */
if (IS_NANDDUMP && !(opts & OPT_b)) {
int bad_len = MIN(tmp, end_addr) - mtdoffset;
dump_bad(&meminfo, bad_len, !(opts & OPT_o));
}
mtdoffset = tmp;
}
}
cnt = -1;
limit = MIN(meminfo.size, end_addr);
while (mtdoffset < limit) {
int input_fd = IS_NANDWRITE ? STDIN_FILENO : fd;
int output_fd = IS_NANDWRITE ? fd : STDOUT_FILENO;
blockstart = mtdoffset & ~(meminfo.erasesize - 1);
if (blockstart == mtdoffset) {
/* starting a new eraseblock */
mtdoffset = next_good_eraseblock(fd, &meminfo, blockstart);
if (IS_NANDWRITE)
printf("Writing at 0x%08x\n", mtdoffset);
else if (mtdoffset > blockstart) {
int bad_len = MIN(mtdoffset, limit) - blockstart;
dump_bad(&meminfo, bad_len, !(opts & OPT_o));
}
if (mtdoffset >= limit)
break;
}
xlseek(fd, mtdoffset, SEEK_SET);
/* get some more data from input */
cnt = full_read(input_fd, filebuf, meminfo_writesize);
if (cnt == 0) {
/* even with -p, we do not pad past the end of input
* (-p only zero-pads last incomplete page)
*/
break;
}
if (cnt < meminfo_writesize) {
if (IS_NANDDUMP)
bb_error_msg_and_die("short read");
if (!(opts & OPT_p))
bb_error_msg_and_die("input size is not rounded up to page size, "
"use -p to zero pad");
/* zero pad to end of write block */
memset(filebuf + cnt, 0, meminfo_writesize - cnt);
}
xwrite(output_fd, filebuf, meminfo_writesize);
if (IS_NANDDUMP && !(opts & OPT_o)) {
/* Dump OOB data */
oob.start = mtdoffset;
xioctl(fd, MEMREADOOB, &oob);
xwrite(output_fd, oobbuf, meminfo.oobsize);
}
mtdoffset += meminfo_writesize;
if (cnt < meminfo_writesize)
break;
}
if (IS_NANDWRITE && cnt != 0) {
/* We filled entire MTD, but did we reach EOF on input? */
if (full_read(STDIN_FILENO, filebuf, meminfo_writesize) != 0) {
/* no */
bb_error_msg_and_die("not enough space in MTD device");
}
}
if (ENABLE_FEATURE_CLEAN_UP) {
free(filebuf);
close(fd);
}
return EXIT_SUCCESS;
}
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