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cmd: nand biterr - Add support for nand biterr command
The command shall be used to induce bit errors in the nand page manually. The code flips a bit in the specified offset without changing the ECC. This helps to see how the software handles the error. The patch is ported from https://patchwork.ozlabs.org/project/uboot/patch/\ 1325691123-19565-1-git-send-email-holger.brunck@keymile.com The implementation is inspired from 'mtd-utils/nand-utils/nandflipbits.c' Signed-off-by: Balamanikandan Gunasundar <balamanikandan.gunasundar@microchip.com>
This commit is contained in:
Balamanikandan Gunasundar
Tom Rini
parent
75e33b378b
commit
4ea84c5dce
1 changed files with 124 additions and 3 deletions
127
cmd/nand.c
127
cmd/nand.c
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@ -17,6 +17,10 @@
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* and/or modified under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* The function nand_biterror() in this file is inspired from
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* mtd-utils/nand-utils/nandflipbits.c which was released under GPLv2
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* only
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*/
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#include <common.h>
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@ -44,6 +48,116 @@ int find_dev_and_part(const char *id, struct mtd_device **dev,
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u8 *part_num, struct part_info **part);
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#endif
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#define MAX_NUM_PAGES 64
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static int nand_biterror(struct mtd_info *mtd, ulong off, int bit)
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{
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int ret = 0;
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int page = 0;
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ulong block_off;
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u_char *datbuf[MAX_NUM_PAGES]; /* Data and OOB */
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u_char data;
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int pages_per_blk = mtd->erasesize / mtd->writesize;
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struct erase_info einfo;
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if (pages_per_blk > MAX_NUM_PAGES) {
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printf("Too many pages in one erase block\n");
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return 1;
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}
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if (bit < 0 || bit > 7) {
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printf("bit position 0 to 7 is allowed\n");
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return 1;
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}
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/* Allocate memory */
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memset(datbuf, 0, sizeof(datbuf));
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for (page = 0; page < pages_per_blk ; page++) {
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datbuf[page] = malloc(mtd->writesize + mtd->oobsize);
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if (!datbuf[page]) {
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printf("No memory for page buffer\n");
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ret = -ENOMEM;
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goto free_memory;
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}
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}
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/* Align to erase block boundary */
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block_off = off & (~(mtd->erasesize - 1));
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/* Read out memory as first step */
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for (page = 0; page < pages_per_blk ; page++) {
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struct mtd_oob_ops ops;
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loff_t addr = (loff_t)block_off;
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memset(&ops, 0, sizeof(ops));
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ops.datbuf = datbuf[page];
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ops.oobbuf = datbuf[page] + mtd->writesize;
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ops.len = mtd->writesize;
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ops.ooblen = mtd->oobsize;
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ops.mode = MTD_OPS_RAW;
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ret = mtd_read_oob(mtd, addr, &ops);
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if (ret < 0) {
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printf("Error (%d) reading page %08lx\n",
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ret, block_off);
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ret = 1;
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goto free_memory;
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}
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block_off += mtd->writesize;
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}
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/* Erase the block */
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memset(&einfo, 0, sizeof(einfo));
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einfo.mtd = mtd;
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/* Align to erase block boundary */
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einfo.addr = (loff_t)(off & (~(mtd->erasesize - 1)));
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einfo.len = mtd->erasesize;
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ret = mtd_erase(mtd, &einfo);
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if (ret < 0) {
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printf("Error (%d) nand_erase_nand page %08llx\n",
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ret, einfo.addr);
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ret = 1;
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goto free_memory;
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}
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/* Twist a bit in data part */
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block_off = off & (mtd->erasesize - 1);
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data = datbuf[block_off / mtd->writesize][block_off % mtd->writesize];
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data ^= (1 << bit);
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datbuf[block_off / mtd->writesize][block_off % mtd->writesize] = data;
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printf("Flip data at 0x%lx with xor 0x%02x (bit=%d) to value=0x%02x\n",
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off, (1 << bit), bit, data);
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/* Write back twisted data and unmodified OOB */
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/* Align to erase block boundary */
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block_off = off & (~(mtd->erasesize - 1));
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for (page = 0; page < pages_per_blk; page++) {
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struct mtd_oob_ops ops;
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loff_t addr = (loff_t)block_off;
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memset(&ops, 0, sizeof(ops));
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ops.datbuf = datbuf[page];
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ops.oobbuf = datbuf[page] + mtd->writesize;
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ops.len = mtd->writesize;
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ops.ooblen = mtd->oobsize;
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ops.mode = MTD_OPS_RAW;
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ret = mtd_write_oob(mtd, addr, &ops);
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if (ret < 0) {
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printf("Error (%d) write page %08lx\n", ret, block_off);
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ret = 1;
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goto free_memory;
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}
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block_off += mtd->writesize;
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}
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free_memory:
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for (page = 0; page < pages_per_blk ; page++) {
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if (datbuf[page])
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free(datbuf[page]);
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}
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return ret;
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}
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static int nand_dump(struct mtd_info *mtd, ulong off, int only_oob,
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int repeat)
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{
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@ -733,8 +847,15 @@ static int do_nand(struct cmd_tbl *cmdtp, int flag, int argc,
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}
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if (strcmp(cmd, "biterr") == 0) {
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/* todo */
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return 1;
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int bit;
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if (argc != 4)
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goto usage;
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off = (int)simple_strtoul(argv[2], NULL, 16);
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bit = (int)simple_strtoul(argv[3], NULL, 10);
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ret = nand_biterror(mtd, off, bit);
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return ret;
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}
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#ifdef CONFIG_CMD_NAND_LOCK_UNLOCK
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@ -825,7 +946,7 @@ static char nand_help_text[] =
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"nand scrub [-y] off size | scrub.part partition | scrub.chip\n"
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" really clean NAND erasing bad blocks (UNSAFE)\n"
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"nand markbad off [...] - mark bad block(s) at offset (UNSAFE)\n"
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"nand biterr off - make a bit error at offset (UNSAFE)"
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"nand biterr off bit - make a bit error at offset and bit position (UNSAFE)"
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#ifdef CONFIG_CMD_NAND_LOCK_UNLOCK
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"\n"
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"nand lock [tight] [status]\n"
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