[PATCHv3] nandwrite: new mtd-utils applet
Baruch Siach
baruch at tkos.co.il
Tue Aug 24 12:19:46 UTC 2010
Signed-off-by: Baruch Siach <baruch at tkos.co.il>
---
Changes from v2:
Don't give wrong error message when mtdoffset + meminfo.size == input
size
Addressed the comments of Denys Vlasenko:
* Remove redundant NULL initialization
* Delegate argv[] validity check to getopt32
* Document padding behaviour
* Clarify error message when padding is needed
* Simplify the padding check code
Changes from v1:
Addressed the comments of Denys Vlasenko:
* s/getopt/getopt32/
* Don't use argc for smaller code
* s/xopen/xfopen_stdin/
* Zero pad when -p is present
miscutils/nandwrite.c | 130 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 130 insertions(+), 0 deletions(-)
create mode 100644 miscutils/nandwrite.c
diff --git a/miscutils/nandwrite.c b/miscutils/nandwrite.c
new file mode 100644
index 0000000..503b00e
--- /dev/null
+++ b/miscutils/nandwrite.c
@@ -0,0 +1,130 @@
+/*
+ * nandwrite.c - ported to busybox from mtd-utils
+ *
+ * Author: Baruch Siach <baruch at 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>
+
+#define OPTION_P (1 << 0)
+#define OPTION_S (1 << 1)
+
+//usage:#define nandwrite_trivial_usage
+//usage: "MTD_DEVICE [-p] [-s ADDR] [INPUTFILE | -]"
+//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 Set start address (default is 0)"
+
+static unsigned next_good_eraseblock(int fd, struct mtd_info_user *meminfo,
+ unsigned block_offset)
+{
+ loff_t offs = block_offset;
+
+ while (1) {
+ if (block_offset >= meminfo->size)
+ bb_error_msg_and_die("not enough space in MTD device");
+ if (xioctl(fd, MEMGETBADBLOCK, &offs)) {
+ offs += meminfo->erasesize;
+ printf("Skipping bad block at 0x%08llx\n", offs);
+ } else
+ return offs;
+ }
+
+}
+
+int nandwrite_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int nandwrite_main(int argc UNUSED_PARAM, char **argv)
+{
+ unsigned opts;
+ char *opt_s;
+ char *mtd_device, *img;
+ unsigned mtdoffset = 0, blockstart;
+ int fd, ifd = STDIN_FILENO;
+ struct mtd_info_user meminfo;
+ unsigned char *filebuf;
+ ssize_t cnt = -1;
+
+ opt_complementary = "-1:?2";
+ opts = getopt32(argv, "ps:", &opt_s);
+ if (opts & OPTION_S)
+ mtdoffset = bb_strtou(opt_s, NULL, 0);
+ argv += optind;
+ mtd_device = argv[0];
+ img = argv[1];
+
+ fd = xopen(mtd_device, O_RDWR);
+
+ xioctl(fd, MEMGETINFO, &meminfo);
+
+ if (mtdoffset & (meminfo.writesize - 1))
+ bb_error_msg_and_die("start address is not page aligned");
+
+ if (img)
+ ifd = fileno(xfopen_stdin(img));
+
+ filebuf = xmalloc(meminfo.writesize);
+
+ while (mtdoffset < meminfo.size) {
+ 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(ifd, filebuf, meminfo.writesize);
+ if (cnt == 0)
+ /*
+ * we are done; no need for padding since we have
+ * filled the write block
+ */
+ break;
+ if (cnt < meminfo.writesize) {
+ if (!(opts & OPTION_P))
+ bb_error_msg_and_die("unexpected EOF, "
+ "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;
+ }
+
+ /*
+ * the extra full_read() check is needed for the boundary case of
+ * mtdoffset + meminfo.size == input size
+ */
+ if (cnt != 0 && full_read(ifd, filebuf, meminfo.writesize) != 0)
+ /* didn't reach input EOF */
+ bb_error_msg_and_die("not enough space in MTD device");
+
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ free(filebuf);
+ close(ifd);
+ close(fd);
+ }
+
+ return EXIT_SUCCESS;
+}
--
1.7.1
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