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NAND: Always skip blocks on read/write/boot.

Browse source 
Use of the non-skipping versions was almost always (if not always)
an error, and no valid use case has been identified.

Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Scott Wood 2008-06-12 13:13:23 -05:00
parent e1c3dbada3
commit 984e03cdf1
2 changed files with 25 additions and 37 deletions
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27
common/cmd_nand.c
View file

@ -332,8 +332,8 @@ 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 (!s || !strcmp(s, ".jffs2") ||
!strcmp(s, ".e") || !strcmp(s, ".i")) {
if (read) {
/* read */
nand_read_options_t opts;
@ -372,10 +372,8 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
else
ret = nand->write_oob(nand, off, &ops);
} else {
if (read)
ret = nand_read(nand, off, &size, (u_char *)addr);
else
ret = nand_write(nand, off, &size, (u_char *)addr);
printf("Unknown nand command suffix '%s'.\n", s);
return 1;
}
printf(" %d bytes %s: %s\n", size,
@ -492,10 +490,10 @@ 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\n"
"nand read - addr off|partition size\n"
"nand write - addr off|partition size\n"
" read/write 'size' bytes starting at offset 'off'\n"
" to/from memory address 'addr'\n"
" to/from memory address 'addr', skipping bad blocks.\n"
"nand erase [clean] [off size] - erase 'size' bytes from\n"
" offset 'off' (entire device if not specified)\n"
"nand bad - show bad blocks\n"
@ -514,15 +512,17 @@ static int nand_load_image(cmd_tbl_t *cmdtp, nand_info_t *nand,
char *ep, *s;
size_t cnt;
image_header_t *hdr;
int jffs2 = 0;
#if defined(CONFIG_FIT)
const void *fit_hdr = NULL;
#endif
s = strchr(cmd, '.');
if (s != NULL &&
(!strcmp(s, ".jffs2") || !strcmp(s, ".e") || !strcmp(s, ".i")))
jffs2 = 1;
(strcmp(s, ".jffs2") && !strcmp(s, ".e") && !strcmp(s, ".i"))) {
printf("Unknown nand load suffix '%s'\n", s);
show_boot_progress(-53);
return 1;
}
printf("\nLoading from %s, offset 0x%lx\n", nand->name, offset);
@ -559,6 +559,7 @@ static int nand_load_image(cmd_tbl_t *cmdtp, nand_info_t *nand,
}
show_boot_progress (57);
/* FIXME: skip bad blocks */
r = nand_read(nand, offset, &cnt, (u_char *) addr);
if (r) {
puts("** Read error\n");
@ -680,7 +681,7 @@ usage:
U_BOOT_CMD(nboot, 4, 1, do_nandboot,
"nboot - boot from NAND device\n",
"[.jffs2] [partition] | [[[loadAddr] dev] offset]\n");
"[partition] | [[[loadAddr] dev] offset]\n");
#endif

35
doc/README.nand
View file

@ -57,14 +57,9 @@ 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.
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.
Read `size' bytes from `ofs' in NAND flash to `addr'. Blocks that
are marked bad are skipped. If a page cannot be read because an
uncorrectable data error is found, the command stops with an error.
nand read.oob addr ofs|partition size
Read `size' bytes from the out-of-band data area corresponding to
@ -73,17 +68,15 @@ Commands:
for bad blocks or ECC errors.
nand write addr ofs|partition size
Write `size' bytes from `addr' to `ofs' in NAND flash. If a page
cannot be written because it is marked bad or the write fails the
command stops with an error.
Write `size' bytes from `addr' to `ofs' in NAND flash. Blocks that
are marked bad are skipped. If a page cannot be read because an
uncorrectable data error is found, the command stops with an error.
nand write.jffs2 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
after skipping the bad blocks. Compact images, such as those
produced by mkfs.jffs2 should work well, but loading an image copied
from another flash is going to be trouble if there are any bad blocks.
As JFFS2 skips blocks similarly, this allows writing a JFFS2 image,
as long as the image is short enough to fit even after skipping the
bad blocks. Compact images, such as those produced by mkfs.jffs2
should work well, but loading an image copied from another flash is
going to be trouble if there are any bad blocks.
nand write.oob addr ofs|partition size
Write `size' bytes from `addr' to the out-of-band data area
@ -215,12 +208,6 @@ JFFS2 related commands:
using both the new code which is able to skip bad blocks
"nand erase clean" additionally writes JFFS2-cleanmarkers in the oob.
"nand write.jffs2"
like "nand write" but skip found bad eraseblocks
"nand read.jffs2"
like "nand read" but skip found bad eraseblocks
Miscellaneous and testing commands:
"markbad [offset]"
create an artificial bad block (for testing bad block handling)