r3860 - in developers/werner: . nandtilt
werner at sita.openmoko.org
werner at sita.openmoko.org
Thu Jan 17 05:48:29 CET 2008
Author: werner
Date: 2008-01-17 05:48:25 +0100 (Thu, 17 Jan 2008)
New Revision: 3860
Added:
developers/werner/nandtilt/
developers/werner/nandtilt/Makefile
developers/werner/nandtilt/README
developers/werner/nandtilt/mtd-abi.h
developers/werner/nandtilt/nandtilt.c
Log:
A little utility to inflict bit errors on a NAND partition.
Added: developers/werner/nandtilt/Makefile
===================================================================
--- developers/werner/nandtilt/Makefile 2008-01-17 04:34:04 UTC (rev 3859)
+++ developers/werner/nandtilt/Makefile 2008-01-17 04:48:25 UTC (rev 3860)
@@ -0,0 +1,3 @@
+CFLAGS=-Wall -static
+
+nandtilt: nandtilt.c
Added: developers/werner/nandtilt/README
===================================================================
--- developers/werner/nandtilt/README 2008-01-17 04:34:04 UTC (rev 3859)
+++ developers/werner/nandtilt/README 2008-01-17 04:48:25 UTC (rev 3860)
@@ -0,0 +1,19 @@
+nandtilt - Toggle some bits in NAND without updating the ECC
+============================================================
+
+usage: nandtilt device pos ...
+
+nandtilt writes one eraseblock (set to 128kB in the code) of 0xff bytes
+to the specified device. Bits at positions "pos" are cleared. The ECC
+is not updated.
+
+This can be used to simulate bit errors:
+
+flash_eraseall /dev/mtd5
+nandtilt /dev/mtd5 1 8192
+od -x </dev/mtd5
+
+This clears bit 0x02 of the first byte and bit 0x01 of the 1024th byte.
+Then we check if error correction was able to resolve the problem.
+
+mtd-abi.h is copied from mtd-utils.
Added: developers/werner/nandtilt/mtd-abi.h
===================================================================
--- developers/werner/nandtilt/mtd-abi.h 2008-01-17 04:34:04 UTC (rev 3859)
+++ developers/werner/nandtilt/mtd-abi.h 2008-01-17 04:48:25 UTC (rev 3860)
@@ -0,0 +1,158 @@
+/*
+ * $Id: mtd-abi.h,v 1.13 2005/11/07 11:14:56 gleixner Exp $
+ *
+ * Portions of MTD ABI definition which are shared by kernel and user space
+ */
+
+#ifndef __MTD_ABI_H__
+#define __MTD_ABI_H__
+
+#ifndef __KERNEL__ /* Urgh. The whole point of splitting this out into
+ separate files was to avoid #ifdef __KERNEL__ */
+#define __user
+#endif
+
+struct erase_info_user {
+ uint32_t start;
+ uint32_t length;
+};
+
+struct mtd_oob_buf {
+ uint32_t start;
+ uint32_t length;
+ unsigned char __user *ptr;
+};
+
+#define MTD_ABSENT 0
+#define MTD_NORFLASH 3
+#define MTD_NANDFLASH 4
+#define MTD_DATAFLASH 6
+#define MTD_GENERIC_TYPE 7
+
+#define MTD_WRITEABLE 0x400 /* Device is writeable */
+#define MTD_BIT_WRITEABLE 0x800 /* Single bits can be flipped */
+#define MTD_NO_ERASE 0x1000 /* No erase necessary */
+
+// Some common devices / combinations of capabilities
+#define MTD_CAP_ROM 0
+#define MTD_CAP_RAM (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
+#define MTD_CAP_NORFLASH (MTD_WRITEABLE | MTD_BIT_WRITEABLE)
+#define MTD_CAP_NANDFLASH (MTD_WRITEABLE)
+
+
+// Types of automatic ECC/Checksum available
+#define MTD_ECC_NONE 0 // No automatic ECC available
+#define MTD_ECC_RS_DiskOnChip 1 // Automatic ECC on DiskOnChip
+#define MTD_ECC_SW 2 // SW ECC for Toshiba & Samsung devices
+
+/* ECC byte placement */
+#define MTD_NANDECC_OFF 0 // Switch off ECC (Not recommended)
+#define MTD_NANDECC_PLACE 1 // Use the given placement in the structure (YAFFS1 legacy mode)
+#define MTD_NANDECC_AUTOPLACE 2 // Use the default placement scheme
+#define MTD_NANDECC_PLACEONLY 3 // Use the given placement in the structure (Do not store ecc result on read)
+#define MTD_NANDECC_AUTOPL_USR 4 // Use the given autoplacement scheme rather than using the default
+
+/* OTP mode selection */
+#define MTD_OTP_OFF 0
+#define MTD_OTP_FACTORY 1
+#define MTD_OTP_USER 2
+
+struct mtd_info_user {
+ uint8_t type;
+ uint32_t flags;
+ uint32_t size; // Total size of the MTD
+ uint32_t erasesize;
+ uint32_t writesize;
+ uint32_t oobsize; // Amount of OOB data per block (e.g. 16)
+ uint32_t ecctype;
+ uint32_t eccsize;
+};
+
+struct region_info_user {
+ uint32_t offset; /* At which this region starts,
+ * from the beginning of the MTD */
+ uint32_t erasesize; /* For this region */
+ uint32_t numblocks; /* Number of blocks in this region */
+ uint32_t regionindex;
+};
+
+struct otp_info {
+ uint32_t start;
+ uint32_t length;
+ uint32_t locked;
+};
+
+#define MEMGETINFO _IOR('M', 1, struct mtd_info_user)
+#define MEMERASE _IOW('M', 2, struct erase_info_user)
+#define MEMWRITEOOB _IOWR('M', 3, struct mtd_oob_buf)
+#define MEMREADOOB _IOWR('M', 4, struct mtd_oob_buf)
+#define MEMLOCK _IOW('M', 5, struct erase_info_user)
+#define MEMUNLOCK _IOW('M', 6, struct erase_info_user)
+#define MEMGETREGIONCOUNT _IOR('M', 7, int)
+#define MEMGETREGIONINFO _IOWR('M', 8, struct region_info_user)
+#define MEMSETOOBSEL _IOW('M', 9, struct nand_oobinfo)
+#define MEMGETOOBSEL _IOR('M', 10, struct nand_oobinfo)
+#define MEMGETBADBLOCK _IOW('M', 11, loff_t)
+#define MEMSETBADBLOCK _IOW('M', 12, loff_t)
+#define OTPSELECT _IOR('M', 13, int)
+#define OTPGETREGIONCOUNT _IOW('M', 14, int)
+#define OTPGETREGIONINFO _IOW('M', 15, struct otp_info)
+#define OTPLOCK _IOR('M', 16, struct otp_info)
+#define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout)
+#define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats)
+#define MTDFILEMODE _IO('M', 19)
+
+/*
+ * Obsolete legacy interface. Keep it in order not to break userspace
+ * interfaces
+ */
+struct nand_oobinfo {
+ uint32_t useecc;
+ uint32_t eccbytes;
+ uint32_t oobfree[8][2];
+ uint32_t eccpos[32];
+};
+
+struct nand_oobfree {
+ uint32_t offset;
+ uint32_t length;
+};
+
+#define MTD_MAX_OOBFREE_ENTRIES 8
+/*
+ * ECC layout control structure. Exported to userspace for
+ * diagnosis and to allow creation of raw images
+ */
+struct nand_ecclayout {
+ uint32_t eccbytes;
+ uint32_t eccpos[64];
+ uint32_t oobavail;
+ struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
+};
+
+/**
+ * struct mtd_ecc_stats - error correction status
+ *
+ * @corrected: number of corrected bits
+ * @failed: number of uncorrectable errors
+ * @badblocks: number of bad blocks in this partition
+ * @bbtblocks: number of blocks reserved for bad block tables
+ */
+struct mtd_ecc_stats {
+ uint32_t corrected;
+ uint32_t failed;
+ uint32_t badblocks;
+ uint32_t bbtblocks;
+};
+
+/*
+ * Read/write file modes for access to MTD
+ */
+enum mtd_file_modes {
+ MTD_MODE_NORMAL = MTD_OTP_OFF,
+ MTD_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
+ MTD_MODE_OTP_USER = MTD_OTP_USER,
+ MTD_MODE_RAW,
+};
+
+#endif /* __MTD_ABI_H__ */
Added: developers/werner/nandtilt/nandtilt.c
===================================================================
--- developers/werner/nandtilt/nandtilt.c 2008-01-17 04:34:04 UTC (rev 3859)
+++ developers/werner/nandtilt/nandtilt.c 2008-01-17 04:48:25 UTC (rev 3860)
@@ -0,0 +1,78 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+
+#include "mtd-abi.h"
+
+#define ERASE_PAGE (128*1024)
+
+
+static uint8_t buf[ERASE_PAGE];
+
+
+static void usage(const char *name)
+{
+ fprintf(stderr, "usage; %s device pos ...\n", name);
+ exit(1);
+}
+
+
+int main(int argc, char **argv)
+{
+ struct nand_oobinfo none_oobinfo = {
+ .useecc = MTD_NANDECC_OFF,
+ };
+ int i, pos, fd;
+ ssize_t wrote;
+ char *end;
+
+ memset(buf, 0xff, ERASE_PAGE);
+
+ if (argc < 2)
+ usage(*argv);
+ for (i = 2; i != argc; i++) {
+ pos = strtoul(argv[i], &end, 0);
+ if (*end)
+ usage(*argv);
+ buf[pos >> 3] ^= 1 << (pos & 7);
+ }
+
+ fd = open(argv[1], O_WRONLY);
+ if (fd < 0) {
+ perror(argv[1]);
+ exit(1);
+ }
+ switch (ioctl(fd, MTDFILEMODE, (void *) MTD_MODE_RAW)) {
+ case -ENOTTY:
+ if (ioctl(fd, MEMSETOOBSEL, &none_oobinfo) != 0) {
+ perror("MEMSETOOBSEL");
+ close(fd);
+ exit(1);
+ }
+ break;
+ case 0:
+ break;
+ default:
+ perror("MTDFILEMODE");
+ exit(1);
+ }
+
+ wrote = write(fd, buf, ERASE_PAGE);
+ if (wrote < 0) {
+ perror(argv[1]);
+ exit(1);
+ }
+ if (wrote != ERASE_PAGE) {
+ fprintf(stderr, "%s: short write: %d < %d\n", argv[1],
+ (int) wrote, ERASE_PAGE);
+ exit(1);
+ }
+
+ return 0;
+}
More information about the commitlog
mailing list
