New commands nand read.raw and write.raw read/write main and oob area.
Implement previously stubbed nand biterr command.
Document the above and also the previously undocumented read.oob and write.oob.
Signed-off-by: John Rigby jrigby@control4.com --- common/cmd_nand.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 112 insertions(+), 3 deletions(-)
diff --git a/common/cmd_nand.c b/common/cmd_nand.c index 158a55f..a488038 100644 --- a/common/cmd_nand.c +++ b/common/cmd_nand.c @@ -90,6 +90,95 @@ static int nand_dump(nand_info_t *nand, ulong off, int only_oob) return 0; }
+#define NAND_RW_RAW_READ 0 +#define NAND_RW_RAW_WRITE 1 + +static int nand_rdwr_raw(int rdwr, nand_info_t *nand, ulong off, u_char *buf, + size_t size) +{ + struct mtd_oob_ops ops = { + .len = nand->writesize, + .ooblen = nand->oobsize, + .mode = MTD_OOB_RAW, + }; + int i; + int nrblocks = size / nand->writesize; + loff_t addr = (loff_t)(off & ~(nand->writesize - 1)); + + while (nrblocks--) { + ops.datbuf = buf; + /* + * for read oobbuf must be set, but oob data + * will be appended to ops.datbuf + * for write oobbuf is actually used + */ + ops.oobbuf = buf + nand->writesize; + if (rdwr == NAND_RW_RAW_READ) + i = nand->read_oob(nand, addr, &ops); + else + i = nand->write_oob(nand, addr, &ops); + if (i < 0) { + printf("Error (%d) %s page %08lx\n", i, + rdwr == NAND_RW_RAW_READ ? + "reading" : "writing", + (unsigned long)addr); + return 1; + } + + addr += nand->writesize; + buf += (nand->writesize + nand->oobsize); + } + return 0; +} + +static int nand_read_raw(nand_info_t *nand, ulong off, u_char *buf, + size_t size) +{ + return nand_rdwr_raw(NAND_RW_RAW_READ, nand, off, buf, size); +} + +static int nand_write_raw(nand_info_t *nand, ulong off, u_char *buf, + size_t size) +{ + return nand_rdwr_raw(NAND_RW_RAW_WRITE, nand, off, buf, size); +} + +static int nand_biterr(nand_info_t *nand, ulong off, int bit) +{ + int ret = 0; + u_char *buf; + ulong blockoff = off & ~(nand->erasesize - 1); + int byteoff = off & (nand->erasesize - 1); + nand_erase_options_t opts = { + .offset = blockoff, + .length = nand->erasesize, + }; + + buf = malloc(nand->erasesize + + nand->oobsize * (nand->erasesize / nand->writesize)); + if (!buf) { + puts("No memory for page buffer\n"); + return 1; + } + nand_read_raw(nand, blockoff, buf, nand->erasesize); + + ret = nand_erase_opts(nand, &opts); + if (ret) { + puts("Failed to erase block at %x\n"); + return ret; + } + + printf("toggling bit %x in byte %x in block %x %02x ->", + bit, byteoff, blockoff, buf[byteoff]); + + buf[byteoff] ^= (1 << bit); + + printf("%02x\n", buf[byteoff]); + + nand_write_raw(nand, blockoff, buf, nand->erasesize); + free(buf); + return 0; +} /* ------------------------------------------------------------------------- */
static inline int str2long(char *p, ulong *num) @@ -401,6 +490,13 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) ret = nand->read_oob(nand, off, &ops); else ret = nand->write_oob(nand, off, &ops); + } else if (!strcmp(s, ".raw")) { + if (read) + ret = nand_read_raw(nand, off, + (u_char *)addr, size); + else + ret = nand_write_raw(nand, off, + (u_char *)addr, size); } else { printf("Unknown nand command suffix '%s'.\n", s); return 1; @@ -437,9 +533,19 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) } return ret; } - if (strcmp(cmd, "biterr") == 0) { - /* todo */ + off = (ulong)simple_strtoul(argv[2], NULL, 16); + i = (int)simple_strtoul(argv[3], NULL, 16); + + int ret = nand_biterr(nand, off, i); + if (ret == 0) { + printf("byte offset 0x%08lx toggled bit %d\n", + (ulong) off, i); + return 0; + } else { + printf("byte offset 0x%08lx could not toggle bit %d\n", + (ulong) addr, i); + } return 1; }
@@ -494,13 +600,16 @@ U_BOOT_CMD(nand, CONFIG_SYS_MAXARGS, 1, do_nand, "nand write - addr off|partition size\n" " read/write 'size' bytes starting at offset 'off'\n" " to/from memory address 'addr', skipping bad blocks.\n" + " .oob - reads/writes oob only.\n" + " .raw - reads/writes both main and oob with no error\n" + " detection or correction\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" "nand dump[.oob] off - dump page\n" "nand scrub - really clean NAND erasing bad blocks (UNSAFE)\n" "nand markbad off [...] - mark bad block(s) at offset (UNSAFE)\n" - "nand biterr off - make a bit error at offset (UNSAFE)" + "nand biterr off bitno - toggle bit bitno in byte off (UNSAFE)\n" #ifdef CONFIG_CMD_NAND_LOCK_UNLOCK "\n" "nand lock [tight] [status]\n"