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nandwrite: new applet
function old new delta nandwrite_main - 382 +382 packed_usage 27119 27135 +16 applet_names 2275 2285 +10 applet_main 1340 1344 +4 applet_nameofs 670 672 +2 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 4/0 up/down: 414/0) Total: 414 bytes Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
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miscutils/nandwrite.c
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128
miscutils/nandwrite.c
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/*
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* nandwrite.c - ported to busybox from mtd-utils
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*
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* Author: Baruch Siach <baruch@tkos.co.il>, Orex Computed Radiography
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*
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* TODO: add support for large (>4GB) MTD devices
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*/
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//applet:IF_NANDWRITE(APPLET(nandwrite, _BB_DIR_USR_SBIN, _BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_NANDWRITE) += nandwrite.o
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//config:config NANDWRITE
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//config: bool "nandwrite"
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//config: default n
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//config: depends on PLATFORM_LINUX
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//config: help
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//config: Write to the specified MTD device, with bad blocks awareness
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#include "libbb.h"
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#include <mtd/mtd-user.h>
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//usage:#define nandwrite_trivial_usage
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//usage: "[-p] [-s ADDR] MTD_DEVICE [FILE]"
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//usage:#define nandwrite_full_usage "\n\n"
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//usage: "Write to the specified MTD device\n"
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//usage: "\nOptions:"
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//usage: "\n -p Pad to page size"
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//usage: "\n -s ADDR Start address"
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static unsigned next_good_eraseblock(int fd, struct mtd_info_user *meminfo,
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unsigned block_offset)
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{
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while (1) {
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loff_t offs;
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if (block_offset >= meminfo->size)
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bb_error_msg_and_die("not enough space in MTD device");
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offs = block_offset;
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if (xioctl(fd, MEMGETBADBLOCK, &offs) == 0)
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return block_offset;
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/* ioctl returned 1 => "bad block" */
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printf("Skipping bad block at 0x%08x\n", block_offset);
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block_offset += meminfo->erasesize;
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}
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}
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int nandwrite_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int nandwrite_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opts;
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int fd;
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ssize_t cnt;
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unsigned mtdoffset, meminfo_writesize;
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struct mtd_info_user meminfo;
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unsigned char *filebuf;
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const char *opt_s = "0";
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enum {
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OPT_p = (1 << 0),
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OPT_s = (1 << 1),
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};
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opt_complementary = "-1:?2";
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opts = getopt32(argv, "ps:", &opt_s);
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argv += optind;
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if (argv[1])
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xmove_fd(xopen_stdin(argv[1]), STDIN_FILENO);
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fd = xopen(argv[0], O_RDWR);
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xioctl(fd, MEMGETINFO, &meminfo);
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mtdoffset = xatou(opt_s);
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/* Pull it into a CPU register (hopefully) - smaller code that way */
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meminfo_writesize = meminfo.writesize;
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if (mtdoffset & (meminfo_writesize - 1))
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bb_error_msg_and_die("start address is not page aligned");
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filebuf = xmalloc(meminfo_writesize);
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cnt = -1;
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while (mtdoffset < meminfo.size) {
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unsigned blockstart = mtdoffset & ~(meminfo.erasesize - 1);
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if (blockstart == mtdoffset) {
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/* starting a new eraseblock */
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mtdoffset = next_good_eraseblock(fd, &meminfo, blockstart);
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printf("Writing at 0x%08x\n", mtdoffset);
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}
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/* get some more data from input */
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cnt = full_read(STDIN_FILENO, filebuf, meminfo_writesize);
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if (cnt == 0) {
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/* even with -p, we do not pad past the end of input
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* (-p only zero-pads last incomplete page)
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*/
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break;
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}
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if (cnt < meminfo_writesize) {
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if (!(opts & OPT_p))
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bb_error_msg_and_die("input size is not rounded up to page size, "
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"use -p to zero pad");
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/* zero pad to end of write block */
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memset(filebuf + cnt, 0, meminfo_writesize - cnt);
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}
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xlseek(fd, mtdoffset, SEEK_SET);
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xwrite(fd, filebuf, meminfo_writesize);
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mtdoffset += meminfo_writesize;
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if (cnt < meminfo_writesize)
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break;
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}
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if (cnt != 0) {
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/* We filled entire MTD, but did we reach EOF on input? */
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if (full_read(STDIN_FILENO, filebuf, meminfo_writesize) != 0) {
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/* no */
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bb_error_msg_and_die("not enough space in MTD device");
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP) {
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free(filebuf);
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close(fd);
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}
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return EXIT_SUCCESS;
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}
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