patch for branch mtd-2.6.22.1 on git://git.denx.de/u-boot-nand-flash.git
nand read(.jffs2|.e|.i) skips bad blocks during read.
write(.jffs2|.e|.i) skips bad blocks during write
nand read will read 0xff for bad block.
Update documentation.
---
common/cmd_nand.c | 73 ++---
doc/README.nand | 16 +-
drivers/mtd/nand/nand_util.c | 814 ++++++++++++------------------------------
include/nand.h | 9 +-
4 files changed, 278 insertions(+), 634 deletions(-)
diff --git a/common/cmd_nand.c b/common/cmd_nand.c
index eff9173..64e825e 100644
--- a/common/cmd_nand.c
+++ b/common/cmd_nand.c
@@ -73,9 +73,10 @@ static int nand_dump(nand_info_t *nand, ulong off, int
only_oob)
while (i--) {
if (!only_oob) {
printf( "\t%02x %02x %02x %02x %02x %02x %02x %02x"
- " %02x %02x %02x %02x %02x %02x %02x
%02x\n",
- p[0], p[1], p[2], p[3], p[4], p[5],
p[6], p[7],
- p[8], p[9], p[10], p[11], p[12], p[13],
p[14], p[15]);
+ " %02x %02x %02x %02x %02x %02x %02x %02x\n",
+ p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],
+ p[8], p[9], p[10], p[11], p[12], p[13], p[14],
+ p[15]);
}
p += 16;
}
@@ -319,7 +320,6 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char
*argv[])
}
- /* read write */
if (strncmp(cmd, "read", 4) == 0 || strncmp(cmd, "write", 5) == 0) {
int read;
@@ -334,33 +334,13 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char
*argv[])
return 1;
s = strchr(cmd, '.');
- if (s != NULL &&
- (!strcmp(s, ".jffs2") || !strcmp(s, ".e") || !strcmp(s,
".i"))) {
- if (read) {
- /* read */
- nand_read_options_t opts;
- memset(&opts, 0, sizeof(opts));
- opts.buffer = (u_char*) addr;
- opts.length = size;
- opts.offset = off;
- opts.quiet = quiet;
-/*
- * ! BROKEN !
- *
- * TODO: Function must be implemented
- *
- * ret = nand_read_opts(nand, &opts);
- */
- } else {
- /* write */
- mtd_oob_ops_t opts;
- memset(&opts, 0, sizeof(opts));
- opts.datbuf = (u_char*) addr;
- opts.len = size;
- opts.ooblen = 64;
- opts.mode = MTD_OOB_AUTO;
- ret = nand_write_opts(nand, off, &opts);
- }
+ if (s != NULL && (!strcmp(s, ".jffs2") ||
+ !strcmp(s, ".e") || !strcmp(s, ".i"))) {
+ if (read)
+ ret = nand_read_skip_bad(nand, off, &size,
(u_char *)addr);
+ else
+ ret = nand_write_skip_bad(nand, off, &size,
(u_char *)addr);
+
} else if (s != NULL && !strcmp(s, ".oob")) {
struct mtd_oob_ops ops;
@@ -374,7 +354,7 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char
*argv[])
ret = nand->write_oob(nand, off, &ops);
} else {
if (read)
- ret = nand_read(nand, off, &size, (u_char
*)addr);
+ ret = nand_read_ff_upon_bad(nand, off, &size,
(u_char *)addr);
else
ret = nand_write(nand, off, &size, (u_char
*)addr);
}
@@ -399,6 +379,7 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char
*argv[])
}
return 1;
}
+
if (strcmp(cmd, "biterr") == 0) {
/* todo */
return 1;
@@ -489,23 +470,31 @@ usage:
return 1;
}
-U_BOOT_CMD(nand, 5, 1, do_nand,
- "nand - NAND sub-system\n",
- "info - show available NAND devices\n"
- "nand device [dev] - show or set current device\n"
- "nand read[.jffs2] - addr off|partition size\n"
- "nand write[.jffs2] - addr off|partition size - read/write `size'
bytes starting\n"
- " at offset `off' to/from memory address `addr'\n"
- "nand erase [clean] [off size] - erase `size' bytes from\n"
- " offset `off' (entire device if not specified)\n"
+U_BOOT_CMD(
+nand, 5, 1, do_nand,
+ "nand - NAND sub-system\n",
+ "info - show available NAND devices\n"
+ "nand device [dev] - show or set current device\n"
+ "nand read[.jffs2|.i|.e] addr off|partition size - read `size' bytes\n"
+ " starting at offset `off' to memory address `addr'. Using one of the\n"
+ " `.' options bad blocks are skipped, otherwise they are read as 0xff\n"
+ "nand write[.jffs2|.i|.e] addr off|partition size - write `size'\n"
+ " bytes starting at offset `off' from memory address `addr'. Using\n"
+ " one of `.' options bad blocks is skipped otherwise write fails\n"
+ "nand erase [clean] [off size] - erase `size' bytes from offset\n"
+ " `off' (entire device if not specified)\n"
"nand bad - show bad blocks\n"
"nand dump[.oob] off - dump page\n"
"nand scrub - really clean NAND erasing bad blocks (UNSAFE)\n"
"nand markbad off - mark bad block at offset (UNSAFE)\n"
"nand biterr off - make a bit error at offset (UNSAFE)\n"
- "nand lock [tight] [status] - bring nand to lock state or display
locked pages\n"
+ "nand lock [tight] [status] - bring nand to lock state or display\n"
+ " locked pages\n"
"nand unlock [offset] [size] - unlock section\n");
+
+
+
static int nand_load_image(cmd_tbl_t *cmdtp, nand_info_t *nand,
ulong offset, ulong addr, char *cmd)
{
diff --git a/doc/README.nand b/doc/README.nand
index 647a6b8..6db71a8 100644
--- a/doc/README.nand
+++ b/doc/README.nand
@@ -57,14 +57,14 @@ Commands:
Print information about all of the NAND devices found.
nand read addr ofs|partition size
- Read `size' bytes from `ofs' in NAND flash to `addr'. If a page
- cannot be read because it is marked bad or an uncorrectable data
- error is found the command stops with an error.
+ Read `size' bytes from `ofs' in NAND flash to `addr'. Data for
+ blocks that are marked bad is read as 0xff. If an uncorrectable
+ data error is found the command stops with an error.
- nand read.jffs2 addr ofs|partition size
- Like `read', but the data for blocks that are marked bad is read as
- 0xff. This gives a readable JFFS2 image that can be processed by
- the JFFS2 commands such as ls and fsload.
+ nand read.jffs2|.i addr ofs|partition size
+ Like `read', but the data for blocks that are marked bad are skipped
+ and it read the next block instead. This gives a readable JFFS2 image
+ that can be processed by the JFFS2 commands such as ls and fsload.
nand read.oob addr ofs|partition size
Read `size' bytes from the out-of-band data area corresponding to
@@ -77,7 +77,7 @@ Commands:
cannot be written because it is marked bad or the write fails the
command stops with an error.
- nand write.jffs2 addr ofs|partition size
+ nand write.jffs2|.i addr ofs|partition size
Like `write', but blocks that are marked bad are skipped and the
data is written to the next block instead. This allows writing
a JFFS2 image, as long as the image is short enough to fit even
diff --git a/drivers/mtd/nand/nand_util.c b/drivers/mtd/nand/nand_util.c
index 1916aca..aa244fe 100644
--- a/drivers/mtd/nand/nand_util.c
+++ b/drivers/mtd/nand/nand_util.c
@@ -248,586 +248,6 @@ static struct nand_ecclayout autoplace_ecclayout = {
};
#endif
-
-/**
- * nand_fill_oob - [Internal] Transfer client buffer to oob
- * @chip: nand chip structure
- * @oob: oob data buffer
- * @ops: oob ops structure
- *
- * Copied from nand_base.c
- */
-static uint8_t *nand_fill_oob(struct nand_chip *chip, uint8_t *oob,
- struct mtd_oob_ops *ops)
-{
- size_t len = ops->ooblen;
-
- switch(ops->mode) {
-
- case MTD_OOB_PLACE:
- case MTD_OOB_RAW:
- memcpy(chip->oob_poi + ops->ooboffs, oob, len);
- return oob + len;
-
- case MTD_OOB_AUTO: {
- struct nand_oobfree *free = chip->ecc.layout->oobfree;
- uint32_t boffs = 0, woffs = ops->ooboffs;
- size_t bytes = 0;
-
- for(; free->length && len; free++, len -= bytes) {
- /* Write request not from offset 0 ? */
- if (unlikely(woffs)) {
- if (woffs >= free->length) {
- woffs -= free->length;
- continue;
- }
- boffs = free->offset + woffs;
- bytes = min_t(size_t, len,
- (free->length - woffs));
- woffs = 0;
- } else {
- bytes = min_t(size_t, len, free->length);
- boffs = free->offset;
- }
- memcpy(chip->oob_poi + boffs, oob, bytes);
- oob += bytes;
- }
- return oob;
- }
- default:
- BUG();
- }
- return NULL;
-}
-
-#define NOTALIGNED(x) (x & (chip->subpagesize - 1)) != 0
-
-
-/* copied from nand_base.c: nand_do_write_ops()
- * Only very small changes
- */
-int nand_write_opts(nand_info_t *mtd, loff_t to, mtd_oob_ops_t *ops)
-{
- int chipnr, realpage, page, blockmask, column;
- struct nand_chip *chip = mtd->priv;
- uint32_t writelen = ops->len;
- uint8_t *oob = ops->oobbuf;
- uint8_t *buf = ops->datbuf;
- int ret, subpage;
-
- ops->retlen = 0;
- if (!writelen)
- return 0;
-
- printk("nand_write_opts: to: 0x%08x, ops->len: 0x%08x\n", to, ops->len);
-
- /* reject writes, which are not page aligned */
- if (NOTALIGNED(to) || NOTALIGNED(ops->len)) {
- printk(KERN_NOTICE "nand_write: "
- "Attempt to write not page aligned data\n");
- return -EINVAL;
- }
-
- column = to & (mtd->writesize - 1);
- subpage = column || (writelen & (mtd->writesize - 1));
-
- if (subpage && oob) {
- printk(KERN_NOTICE "nand_write: "
- "Attempt to write oob to subpage\n");
- return -EINVAL;
- }
-
- chipnr = (int)(to >> chip->chip_shift);
- chip->select_chip(mtd, chipnr);
-
- /* XXX U-BOOT XXX */
-#if 0
- /* Check, if it is write protected */
- if (nand_check_wp(mtd))
- return -EIO;
-#endif
-
- realpage = (int)(to >> chip->page_shift);
- page = realpage & chip->pagemask;
- blockmask = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1;
-
- /* Invalidate the page cache, when we write to the cached page */
- if (to <= (chip->pagebuf << chip->page_shift) &&
- (chip->pagebuf << chip->page_shift) < (to + ops->len))
- chip->pagebuf = -1;
-
- /* If we're not given explicit OOB data, let it be 0xFF */
- if (likely(!oob)) {
- printf("!oob, writing %d bytes with 0xff to chip->oob_poi
(0x%08x)\n", mtd->oobsize, chip->oob_poi);
- memset(chip->oob_poi, 0xff, mtd->oobsize);
- }
-
- while(1) {
- int bytes = mtd->writesize;
- int cached = writelen > bytes && page != blockmask;
- uint8_t *wbuf = buf;
-
- /* Partial page write ? */
- if (unlikely(column || writelen < (mtd->writesize - 1))) {
- cached = 0;
- bytes = min_t(int, bytes - column, (int) writelen);
- chip->pagebuf = -1;
- memset(chip->buffers->databuf, 0xff, mtd->writesize);
- memcpy(&chip->buffers->databuf[column], buf, bytes);
- wbuf = chip->buffers->databuf;
- }
-
- if (unlikely(oob))
- oob = nand_fill_oob(chip, oob, ops);
-
- ret = chip->write_page(mtd, chip, wbuf, page, cached,
- (ops->mode == MTD_OOB_RAW));
- if (ret)
- break;
-
- writelen -= bytes;
- if (!writelen)
- break;
-
- column = 0;
- buf += bytes;
- realpage++;
-
- page = realpage & chip->pagemask;
- /* Check, if we cross a chip boundary */
- if (!page) {
- chipnr++;
- chip->select_chip(mtd, -1);
- chip->select_chip(mtd, chipnr);
- }
- }
-
- ops->retlen = ops->len - writelen;
- if (unlikely(oob))
- ops->oobretlen = ops->ooblen;
- return ret;
-}
-
-/* XXX U-BOOT XXX */
-#if 0
-/**
- * nand_write_opts: - write image to NAND flash with support for various
options
- *
- * @param meminfo NAND device to erase
- * @param opts write options (@see nand_write_options)
- * @return 0 in case of success
- *
- * This code is ported from nandwrite.c from Linux mtd utils by
- * Steven J. Hill and Thomas Gleixner.
- */
-int nand_write_opts(nand_info_t *meminfo, const nand_write_options_t *opts)
-{
- int imglen = 0;
- int pagelen;
- int baderaseblock;
- int blockstart = -1;
- loff_t offs;
- int readlen;
- int ecclayoutchanged = 0;
- int percent_complete = -1;
- struct nand_ecclayout old_ecclayout;
- ulong mtdoffset = opts->offset;
- ulong erasesize_blockalign;
- u_char *buffer = opts->buffer;
- size_t written;
- int result;
-
- if (opts->pad && opts->writeoob) {
- printf("Can't pad when oob data is present.\n");
- return -1;
- }
-
- /* set erasesize to specified number of blocks - to match
- * jffs2 (virtual) block size */
- if (opts->blockalign == 0) {
- erasesize_blockalign = meminfo->erasesize;
- } else {
- erasesize_blockalign = meminfo->erasesize * opts->blockalign;
- }
-
- /* make sure device page sizes are valid */
- if (!(meminfo->oobsize == 16 && meminfo->writesize == 512)
- && !(meminfo->oobsize == 8 && meminfo->writesize == 256)
- && !(meminfo->oobsize == 64 && meminfo->writesize == 2048)) {
- printf("Unknown flash (not normal NAND)\n");
- return -1;
- }
-
- /* read the current oob info */
- memcpy(&old_ecclayout, &meminfo->ecclayout, sizeof(old_ecclayout));
-
- /* write without ecc? */
- if (opts->noecc) {
- memcpy(&meminfo->ecclayout, &none_ecclayout,
- sizeof(meminfo->ecclayout));
- ecclayoutchanged = 1;
- }
-
- /* autoplace ECC? */
- if (opts->autoplace && (old_ecclayout.useecc != MTD_NANDECC_AUTOPLACE))
{
-
- memcpy(&meminfo->ecclayout, &autoplace_ecclayout,
- sizeof(meminfo->ecclayout));
- ecclayoutchanged = 1;
- }
-
- /* force OOB layout for jffs2 or yaffs? */
- if (opts->forcejffs2 || opts->forceyaffs) {
- struct nand_ecclayout *oobsel =
- opts->forcejffs2 ? &jffs2_ecclayout : &yaffs_ecclayout;
-
- if (meminfo->oobsize == 8) {
- if (opts->forceyaffs) {
- printf("YAFSS cannot operate on "
- "256 Byte page size\n");
- goto restoreoob;
- }
- /* Adjust number of ecc bytes */
- jffs2_ecclayout.eccbytes = 3;
- }
-
- memcpy(&meminfo->ecclayout, oobsel, sizeof(meminfo->ecclayout));
- }
-
- /* get image length */
- imglen = opts->length;
- pagelen = meminfo->writesize
- + ((opts->writeoob != 0) ? meminfo->oobsize : 0);
-
- /* check, if file is pagealigned */
- if ((!opts->pad) && ((imglen % pagelen) != 0)) {
- printf("Input block length is not page aligned\n");
- goto restoreoob;
- }
-
- /* check, if length fits into device */
- if (((imglen / pagelen) * meminfo->writesize)
- > (meminfo->size - opts->offset)) {
- printf("Image %d bytes, NAND page %d bytes, "
- "OOB area %u bytes, device size %u bytes\n",
- imglen, pagelen, meminfo->writesize, meminfo->size);
- printf("Input block does not fit into device\n");
- goto restoreoob;
- }
-
- if (!opts->quiet)
- printf("\n");
-
- /* get data from input and write to the device */
- while (imglen && (mtdoffset < meminfo->size)) {
-
- WATCHDOG_RESET ();
-
- /*
- * new eraseblock, check for bad block(s). Stay in the
- * loop to be sure if the offset changes because of
- * a bad block, that the next block that will be
- * written to is also checked. Thus avoiding errors if
- * the block(s) after the skipped block(s) is also bad
- * (number of blocks depending on the blockalign
- */
- while (blockstart != (mtdoffset & (~erasesize_blockalign+1))) {
- blockstart = mtdoffset & (~erasesize_blockalign+1);
- offs = blockstart;
- baderaseblock = 0;
-
- /* check all the blocks in an erase block for
- * bad blocks */
- do {
- int ret = meminfo->block_isbad(meminfo, offs);
-
- if (ret < 0) {
- printf("Bad block check failed\n");
- goto restoreoob;
- }
- if (ret == 1) {
- baderaseblock = 1;
- if (!opts->quiet)
- printf("\rBad block at 0x%lx "
- "in erase block from "
- "0x%x will be skipped\n",
- (long) offs,
- blockstart);
- }
-
- if (baderaseblock) {
- mtdoffset = blockstart
- + erasesize_blockalign;
- }
- offs += erasesize_blockalign
- / opts->blockalign;
- } while (offs < blockstart + erasesize_blockalign);
- }
-
- readlen = meminfo->writesize;
- if (opts->pad && (imglen < readlen)) {
- readlen = imglen;
- memset(data_buf + readlen, 0xff,
- meminfo->writesize - readlen);
- }
-
- /* read page data from input memory buffer */
- memcpy(data_buf, buffer, readlen);
- buffer += readlen;
-
- if (opts->writeoob) {
- /* read OOB data from input memory block, exit
- * on failure */
- memcpy(oob_buf, buffer, meminfo->oobsize);
- buffer += meminfo->oobsize;
-
- /* write OOB data first, as ecc will be placed
- * in there*/
- result = meminfo->write_oob(meminfo,
- mtdoffset,
- meminfo->oobsize,
- &written,
- (unsigned char *)
- &oob_buf);
-
- if (result != 0) {
- printf("\nMTD writeoob failure: %d\n",
- result);
- goto restoreoob;
- }
- imglen -= meminfo->oobsize;
- }
-
- /* write out the page data */
- result = meminfo->write(meminfo,
- mtdoffset,
- meminfo->writesize,
- &written,
- (unsigned char *) &data_buf);
-
- if (result != 0) {
- printf("writing NAND page at offset 0x%lx failed\n",
- mtdoffset);
- goto restoreoob;
- }
- imglen -= readlen;
-
- if (!opts->quiet) {
- unsigned long long n = (unsigned long long)
- (opts->length-imglen) * 100;
- int percent;
-
- do_div(n, opts->length);
- percent = (int)n;
-
- /* output progress message only at whole percent
- * steps to reduce the number of messages printed
- * on (slow) serial consoles
- */
- if (percent != percent_complete) {
- printf("\rWriting data at 0x%x "
- "-- %3d%% complete.",
- mtdoffset, percent);
- percent_complete = percent;
- }
- }
-
- mtdoffset += meminfo->writesize;
- }
-
- if (!opts->quiet)
- printf("\n");
-
-restoreoob:
- if (ecclayoutchanged) {
- memcpy(&meminfo->ecclayout, &old_ecclayout,
- sizeof(meminfo->ecclayout));
- }
-
- if (imglen > 0) {
- printf("Data did not fit into device, due to bad blocks\n");
- return -1;
- }
-
- /* return happy */
- return 0;
-}
-
-/**
- * nand_read_opts: - read image from NAND flash with support for various
options
- *
- * @param meminfo NAND device to erase
- * @param opts read options (@see struct nand_read_options)
- * @return 0 in case of success
- *
- */
-int nand_read_opts(nand_info_t *meminfo, const nand_read_options_t *opts)
-{
- int imglen = opts->length;
- int pagelen;
- int baderaseblock;
- int blockstart = -1;
- int percent_complete = -1;
- loff_t offs;
- size_t readlen;
- ulong mtdoffset = opts->offset;
- u_char *buffer = opts->buffer;
- int result;
-
- /* make sure device page sizes are valid */
- if (!(meminfo->oobsize == 16 && meminfo->writesize == 512)
- && !(meminfo->oobsize == 8 && meminfo->writesize == 256)
- && !(meminfo->oobsize == 64 && meminfo->writesize == 2048)) {
- printf("Unknown flash (not normal NAND)\n");
- return -1;
- }
-
- pagelen = meminfo->writesize
- + ((opts->readoob != 0) ? meminfo->oobsize : 0);
-
- /* check, if length is not larger than device */
- if (((imglen / pagelen) * meminfo->writesize)
- > (meminfo->size - opts->offset)) {
- printf("Image %d bytes, NAND page %d bytes, "
- "OOB area %u bytes, device size %u bytes\n",
- imglen, pagelen, meminfo->writesize, meminfo->size);
- printf("Input block is larger than device\n");
- return -1;
- }
-
- if (!opts->quiet)
- printf("\n");
-
- /* get data from input and write to the device */
- while (imglen && (mtdoffset < meminfo->size)) {
-
- WATCHDOG_RESET ();
-
- /*
- * new eraseblock, check for bad block(s). Stay in the
- * loop to be sure if the offset changes because of
- * a bad block, that the next block that will be
- * written to is also checked. Thus avoiding errors if
- * the block(s) after the skipped block(s) is also bad
- * (number of blocks depending on the blockalign
- */
- while (blockstart != (mtdoffset & (~meminfo->erasesize+1))) {
- blockstart = mtdoffset & (~meminfo->erasesize+1);
- offs = blockstart;
- baderaseblock = 0;
-
- /* check all the blocks in an erase block for
- * bad blocks */
- do {
- int ret = meminfo->block_isbad(meminfo, offs);
-
- if (ret < 0) {
- printf("Bad block check failed\n");
- return -1;
- }
- if (ret == 1) {
- baderaseblock = 1;
- if (!opts->quiet)
- printf("\rBad block at 0x%lx "
- "in erase block from "
- "0x%x will be skipped\n",
- (long) offs,
- blockstart);
- }
-
- if (baderaseblock) {
- mtdoffset = blockstart
- + meminfo->erasesize;
- }
- offs += meminfo->erasesize;
-
- } while (offs < blockstart + meminfo->erasesize);
- }
-
-
- /* read page data to memory buffer */
- result = meminfo->read(meminfo,
- mtdoffset,
- meminfo->writesize,
- &readlen,
- (unsigned char *) &data_buf);
-
- if (result != 0) {
- printf("reading NAND page at offset 0x%lx failed\n",
- mtdoffset);
- return -1;
- }
-
- if (imglen < readlen) {
- readlen = imglen;
- }
-
- memcpy(buffer, data_buf, readlen);
- buffer += readlen;
- imglen -= readlen;
-
- if (opts->readoob) {
- result = meminfo->read_oob(meminfo,
- mtdoffset,
- meminfo->oobsize,
- &readlen,
- (unsigned char *)
- &oob_buf);
-
- if (result != 0) {
- printf("\nMTD readoob failure: %d\n",
- result);
- return -1;
- }
-
-
- if (imglen < readlen) {
- readlen = imglen;
- }
-
- memcpy(buffer, oob_buf, readlen);
-
- buffer += readlen;
- imglen -= readlen;
- }
-
- if (!opts->quiet) {
- unsigned long long n = (unsigned long long)
- (opts->length-imglen) * 100;
- int percent;
-
- do_div(n, opts->length);
- percent = (int)n;
-
- /* output progress message only at whole percent
- * steps to reduce the number of messages printed
- * on (slow) serial consoles
- */
- if (percent != percent_complete) {
- if (!opts->quiet)
- printf("\rReading data from 0x%x "
- "-- %3d%% complete.",
- mtdoffset, percent);
- percent_complete = percent;
- }
- }
-
- mtdoffset += meminfo->writesize;
- }
-
- if (!opts->quiet)
- printf("\n");
-
- if (imglen > 0) {
- printf("Could not read entire image due to bad blocks\n");
- return -1;
- }
-
- /* return happy */
- return 0;
-}
-#endif
-
/* XXX U-BOOT XXX */
#if 0
/******************************************************************************
@@ -1007,4 +427,236 @@ int nand_unlock(nand_info_t *meminfo, ulong start, ulong
length)
}
#endif
-#endif
+/**
+ * get_len_incl_bad
+ *
+ * Check if length including bad blocks fits into device.
+ *
+ * @param nand NAND device
+ * @param offset offset in flash
+ * @param length image length
+ * @return image length including bad blocks
+ */
+static ulong get_len_incl_bad (nand_info_t *nand, ulong offset,
+ const ulong length)
+{
+ ulong len_incl_bad = 0;
+ ulong len_excl_bad = 0;
+ ulong block_len;
+
+
+ while (len_excl_bad < length) {
+ block_len = nand->erasesize - (offset & (nand->erasesize - 1));
+
+ if (!nand_block_isbad (nand, offset & ~(nand->erasesize - 1)))
+ len_excl_bad += block_len;
+
+ len_incl_bad += block_len;
+ offset += block_len;
+
+ if ((offset + len_incl_bad) > nand->size)
+ break;
+ }
+
+ return len_incl_bad;
+}
+
+/**
+ * nand_write_skip_bad:
+ *
+ * Write image to NAND flash.
+ * Blocks that are marked bad are skipped and the is written to the next
+ * block instead as long as the image is short enough to fit even after
+ * skipping the bad blocks.
+ *
+ * @param nand NAND device
+ * @param offset offset in flash
+ * @param length buffer length
+ * @param buf buffer to read from
+ * @return 0 in case of success
+ */
+int nand_write_skip_bad(nand_info_t *nand, ulong offset, ulong *length,
+ u_char *buffer)
+{
+ int rval;
+ ulong left_to_write = *length;
+ ulong len_incl_bad;
+ u_char *p_buffer = buffer;
+
+
+ /* Reject writes, which are not page aligned */
+ if (((offset & (nand->writesize - 1)) != 0) ||
+ ((*length & (nand->writesize - 1)) != 0)) {
+ printf ("Attempt to write not page aligned data\n");
+ return -EINVAL;
+ }
+
+ len_incl_bad = get_len_incl_bad (nand, offset, *length);
+
+ if ((offset + len_incl_bad) > nand->size) {
+ printf ("Attempt to write outside the flash area\n");
+ return -EINVAL;
+ }
+
+ if (len_incl_bad == *length)
+ {
+ rval = nand_write (nand, offset, length, buffer);
+ if (rval != 0) {
+ printf ("NAND write to offset %x failed %d\n", rval);
+ return rval;
+ }
+ }
+
+ while (left_to_write > 0) {
+ ulong block_offset = offset & (nand->erasesize - 1);
+ ulong write_size;
+
+ if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
+ printf ("Skip bad block 0x%08x\n",
+ offset & ~(nand->erasesize - 1));
+ offset += nand->erasesize - block_offset;
+ continue;
+ }
+
+ if (left_to_write < (nand->erasesize - block_offset))
+ write_size = left_to_write;
+ else
+ write_size = nand->erasesize - block_offset;
+
+ rval = nand_write (nand, offset, &write_size, p_buffer);
+ if (rval != 0) {
+ printf ("NAND write to offset %x failed %d\n", rval);
+ *length -= left_to_write;
+ return rval;
+ }
+
+ left_to_write -= write_size;
+ offset += write_size;
+ p_buffer += write_size;
+ }
+
+ return 0;
+}
+
+/**
+ * nand_read_skip_bad:
+ *
+ * Read image from NAND flash.
+ * Blocks that are marked bad are skipped and the next block is readen
+ * instead as long as the image is short enough to fit even after skipping the
+ * bad blocks.
+ *
+ * @param nand NAND device
+ * @param offset offset in flash
+ * @param length buffer length
+ * @param buffer buffer to write to
+ * @return 0 in case of success
+ */
+int nand_read_skip_bad(nand_info_t *nand, ulong offset, ulong *length,
+ u_char *buffer)
+{
+ int rval;
+ ulong left_to_read = *length;
+ ulong len_incl_bad;
+ u_char *p_buffer = buffer;
+
+
+ len_incl_bad = get_len_incl_bad (nand, offset, *length);
+
+ if ((offset + len_incl_bad) > nand->size) {
+ printf ("Attempt to read outside the flash area\n");
+ return -EINVAL;
+ }
+
+ if (len_incl_bad == *length)
+ {
+ rval = nand_read (nand, offset, length, buffer);
+ if (rval != 0) {
+ printf ("NAND read from offset %x failed %d\n", rval);
+ return rval;
+ }
+ }
+
+ while (left_to_read > 0) {
+ ulong block_offset = offset & (nand->erasesize - 1);
+ ulong read_length;
+
+ if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
+ printf ("Skip bad block 0x%08x\n",
+ offset & ~(nand->erasesize - 1));
+ offset += nand->erasesize - block_offset;
+ continue;
+ }
+
+ if (left_to_read < (nand->erasesize - block_offset))
+ read_length = left_to_read;
+ else
+ read_length = nand->erasesize - block_offset;
+
+ rval = nand_read (nand, offset, &read_length, p_buffer);
+ if (rval != 0) {
+ printf ("NAND read from offset %x failed %d\n", rval);
+ *length -= left_to_read;
+ return rval;
+ }
+
+ left_to_read -= read_length;
+ offset += read_length;
+ p_buffer += read_length;
+ }
+
+ return 0;
+}
+
+/**
+ * nand_read_ff_upon_bad:
+ *
+ * Read image from NAND flash.
+ * Data from blocks that are marked bad is read as 0xff.
+ *
+ * @param nand NAND device
+ * @param offset offset in flash
+ * @param length buffer length
+ * @param buffer buffer to write to
+ * @return 0 in case of success
+ */
+int nand_read_ff_upon_bad (nand_info_t *nand, ulong offset, ulong *length,
+ u_char *buffer)
+{
+ int rval;
+ ulong left_to_read = *length;
+ u_char *p_buffer = buffer;
+
+
+ while (left_to_read > 0) {
+ ulong block_offset = offset & (nand->erasesize - 1);
+ ulong read_length;
+
+ if (left_to_read < (nand->erasesize - block_offset))
+ read_length = left_to_read;
+ else
+ read_length = nand->erasesize - block_offset;
+
+ if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
+ printf ("Bad block 0x%08x. Read this block as 0xff\n",
+ offset & ~(nand->erasesize - 1));
+ memset (p_buffer, 0xff, read_length);
+ } else {
+ rval = nand_read (nand, offset, &read_length, p_buffer);
+ if (rval != 0) {
+ printf ("NAND read from offset %x failed %d\n",
+ rval);
+ *length -= left_to_read;
+ return rval;
+ }
+ }
+
+ left_to_read -= read_length;
+ offset += read_length;
+ p_buffer += read_length;
+ }
+
+ return 0;
+}
+
+#endif /* defined(CONFIG_CMD_NAND) && !defined(CFG_NAND_LEGACY) */
diff --git a/include/nand.h b/include/nand.h
index 67dedbe..6e755c9 100644
--- a/include/nand.h
+++ b/include/nand.h
@@ -106,9 +106,12 @@ struct nand_erase_options {
typedef struct nand_erase_options nand_erase_options_t;
-int nand_write_opts(nand_info_t *mtd, loff_t to, mtd_oob_ops_t *ops);
-
-int nand_read_opts(nand_info_t *meminfo, const nand_read_options_t *opts);
+int nand_read_ff_upon_bad(nand_info_t *nand, ulong offset, ulong *length,
+ u_char *buffer);
+int nand_read_skip_bad(nand_info_t *nand, ulong offset, ulong *length,
+ u_char *buffer);
+int nand_write_skip_bad(nand_info_t *nand, ulong offset, ulong *length,
+ u_char *buffer);
int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts);
#define NAND_LOCK_STATUS_TIGHT 0x01
--
1.5.2.5
-------------------------------------------------------------------------
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