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>

1 files changed, 128 insertions, 0 deletions

diff --git a/miscutils/nandwrite.c b/miscutils/nandwrite.c
new file mode 100644
index 000000000..a20f7f384
--- /dev/null
+++ b/miscutils/nandwrite.c
@@ -0,0 +1,128 @@
+/*
+ * nandwrite.c - 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
+ */
+
+//applet:IF_NANDWRITE(APPLET(nandwrite, _BB_DIR_USR_SBIN, _BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_NANDWRITE) += nandwrite.o
+
+//config:config NANDWRITE
+//config:	bool "nandwrite"
+//config:	default n
+//config:	depends on PLATFORM_LINUX
+//config:	help
+//config:	  Write to the specified MTD device, with bad blocks awareness
+
+#include "libbb.h"
+#include <mtd/mtd-user.h>
+
+//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:     "\nOptions:"
+//usage:     "\n	-p	Pad to page size"
+//usage:     "\n	-s ADDR	Start address"
+
+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)
+			bb_error_msg_and_die("not enough space in MTD device");
+		offs = block_offset;
+		if (xioctl(fd, MEMGETBADBLOCK, &offs) == 0)
+			return block_offset;
+		/* ioctl returned 1 => "bad block" */
+		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)
+{
+	unsigned opts;
+	int fd;
+	ssize_t cnt;
+	unsigned mtdoffset, meminfo_writesize;
+	struct mtd_info_user meminfo;
+	unsigned char *filebuf;
+	const char *opt_s = "0";
+	enum {
+		OPT_p = (1 << 0),
+		OPT_s = (1 << 1),
+	};
+
+	opt_complementary = "-1:?2";
+	opts = getopt32(argv, "ps:", &opt_s);
+	argv += optind;
+
+	if (argv[1])
+		xmove_fd(xopen_stdin(argv[1]), STDIN_FILENO);
+
+	fd = xopen(argv[0], O_RDWR);
+	xioctl(fd, MEMGETINFO, &meminfo);
+
+	mtdoffset = xatou(opt_s);
+
+	/* 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);
+
+	cnt = -1;
+	while (mtdoffset < meminfo.size) {
+		unsigned blockstart = mtdoffset & ~(meminfo.erasesize - 1);
+		if (blockstart == mtdoffset) {
+			/* starting a new eraseblock */
+			mtdoffset = next_good_eraseblock(fd, &meminfo, blockstart);
+			printf("Writing at 0x%08x\n", mtdoffset);
+		}
+		/* get some more data from input */
+		cnt = full_read(STDIN_FILENO, 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 (!(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);
+		}
+		xlseek(fd, mtdoffset, SEEK_SET);
+		xwrite(fd, filebuf, meminfo_writesize);
+		mtdoffset += meminfo_writesize;
+		if (cnt < meminfo_writesize)
+			break;
+	}
+
+	if (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;
+}