diff options
Diffstat (limited to 'env/fw_env.c')
| -rw-r--r-- | env/fw_env.c | 1122 |
1 files changed, 1122 insertions, 0 deletions
diff --git a/env/fw_env.c b/env/fw_env.c new file mode 100644 index 0000000..a46205d --- /dev/null +++ b/env/fw_env.c @@ -0,0 +1,1122 @@ +/* + * (C) Copyright 2000-2008 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * (C) Copyright 2008 + * Guennadi Liakhovetski, DENX Software Engineering, lg@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <stddef.h> +#include <string.h> +#include <sys/types.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <unistd.h> + +#ifdef MTD_OLD +# include <stdint.h> +# include <linux/mtd/mtd.h> +#else +# define __user /* nothing */ +# include <mtd/mtd-user.h> +#endif + +#include "fw_env.h" + +#define CMD_GETENV "fw_printenv" +#define CMD_SETENV "fw_setenv" + +#define min(x, y) ({ \ + typeof(x) _min1 = (x); \ + typeof(y) _min2 = (y); \ + (void) (&_min1 == &_min2); \ + _min1 < _min2 ? _min1 : _min2; }) + +struct envdev_s { + char devname[16]; /* Device name */ + ulong devoff; /* Device offset */ + ulong env_size; /* environment size */ + ulong erase_size; /* device erase size */ + ulong env_sectors; /* number of environment sectors */ + uint8_t mtd_type; /* type of the MTD device */ +}; + +static struct envdev_s envdevices[2] = +{ + { + .mtd_type = MTD_ABSENT, + }, { + .mtd_type = MTD_ABSENT, + }, +}; +static int dev_current; + +#define DEVNAME(i) envdevices[(i)].devname +#define DEVOFFSET(i) envdevices[(i)].devoff +#define ENVSIZE(i) envdevices[(i)].env_size +#define DEVESIZE(i) envdevices[(i)].erase_size +#define ENVSECTORS(i) envdevices[(i)].env_sectors +#define DEVTYPE(i) envdevices[(i)].mtd_type + +#define CONFIG_ENV_SIZE ENVSIZE(dev_current) + +#define ENV_SIZE getenvsize() + +struct env_image_single { + uint32_t crc; /* CRC32 over data bytes */ + char data[]; +}; + +struct env_image_redundant { + uint32_t crc; /* CRC32 over data bytes */ + unsigned char flags; /* active or obsolete */ + char data[]; +}; + +enum flag_scheme { + FLAG_NONE, + FLAG_BOOLEAN, + FLAG_INCREMENTAL, +}; + +struct environment { + void *image; + uint32_t *crc; + unsigned char *flags; + char *data; + enum flag_scheme flag_scheme; +}; + +static struct environment environment = { + .flag_scheme = FLAG_NONE, +}; + +static int HaveRedundEnv = 0; + +static unsigned char active_flag = 1; +/* obsolete_flag must be 0 to efficiently set it on NOR flash without erasing */ +static unsigned char obsolete_flag = 0; + + +#define XMK_STR(x) #x +#define MK_STR(x) XMK_STR(x) + +static char default_environment[] = { +#if defined(CONFIG_BOOTARGS) + "bootargs=" CONFIG_BOOTARGS "\0" +#endif +#if defined(CONFIG_BOOTCOMMAND) + "bootcmd=" CONFIG_BOOTCOMMAND "\0" +#endif +#if defined(CONFIG_RAMBOOTCOMMAND) + "ramboot=" CONFIG_RAMBOOTCOMMAND "\0" +#endif +#if defined(CONFIG_NFSBOOTCOMMAND) + "nfsboot=" CONFIG_NFSBOOTCOMMAND "\0" +#endif +#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0) + "bootdelay=" MK_STR (CONFIG_BOOTDELAY) "\0" +#endif +#if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0) + "baudrate=" MK_STR (CONFIG_BAUDRATE) "\0" +#endif +#ifdef CONFIG_LOADS_ECHO + "loads_echo=" MK_STR (CONFIG_LOADS_ECHO) "\0" +#endif +#ifdef CONFIG_ETHADDR + "ethaddr=" MK_STR (CONFIG_ETHADDR) "\0" +#endif +#ifdef CONFIG_ETH1ADDR + "eth1addr=" MK_STR (CONFIG_ETH1ADDR) "\0" +#endif +#ifdef CONFIG_ETH2ADDR + "eth2addr=" MK_STR (CONFIG_ETH2ADDR) "\0" +#endif +#ifdef CONFIG_ETH3ADDR + "eth3addr=" MK_STR (CONFIG_ETH3ADDR) "\0" +#endif +#ifdef CONFIG_ETH4ADDR + "eth4addr=" MK_STR (CONFIG_ETH4ADDR) "\0" +#endif +#ifdef CONFIG_ETH5ADDR + "eth5addr=" MK_STR (CONFIG_ETH5ADDR) "\0" +#endif +#ifdef CONFIG_ETHPRIME + "ethprime=" CONFIG_ETHPRIME "\0" +#endif +#ifdef CONFIG_IPADDR + "ipaddr=" MK_STR (CONFIG_IPADDR) "\0" +#endif +#ifdef CONFIG_SERVERIP + "serverip=" MK_STR (CONFIG_SERVERIP) "\0" +#endif +#ifdef CONFIG_SYS_AUTOLOAD + "autoload=" CONFIG_SYS_AUTOLOAD "\0" +#endif +#ifdef CONFIG_ROOTPATH + "rootpath=" MK_STR (CONFIG_ROOTPATH) "\0" +#endif +#ifdef CONFIG_GATEWAYIP + "gatewayip=" MK_STR (CONFIG_GATEWAYIP) "\0" +#endif +#ifdef CONFIG_NETMASK + "netmask=" MK_STR (CONFIG_NETMASK) "\0" +#endif +#ifdef CONFIG_HOSTNAME + "hostname=" MK_STR (CONFIG_HOSTNAME) "\0" +#endif +#ifdef CONFIG_BOOTFILE + "bootfile=" MK_STR (CONFIG_BOOTFILE) "\0" +#endif +#ifdef CONFIG_LOADADDR + "loadaddr=" MK_STR (CONFIG_LOADADDR) "\0" +#endif +#ifdef CONFIG_PREBOOT + "preboot=" CONFIG_PREBOOT "\0" +#endif +#ifdef CONFIG_CLOCKS_IN_MHZ + "clocks_in_mhz=" "1" "\0" +#endif +#if defined(CONFIG_PCI_BOOTDELAY) && (CONFIG_PCI_BOOTDELAY > 0) + "pcidelay=" MK_STR (CONFIG_PCI_BOOTDELAY) "\0" +#endif +#ifdef CONFIG_EXTRA_ENV_SETTINGS + CONFIG_EXTRA_ENV_SETTINGS +#endif + "\0" /* Termimate struct environment data with 2 NULs */ +}; + +static int flash_io (int mode); +static char *envmatch (char * s1, char * s2); +static int env_init (void); +static int parse_config (void); + +#if defined(CONFIG_FILE) +static int get_config (char *); +#endif +static inline ulong getenvsize (void) +{ + ulong rc = CONFIG_ENV_SIZE - sizeof (long); + + if (HaveRedundEnv) + rc -= sizeof (char); + return rc; +} + +/* + * Search the environment for a variable. + * Return the value, if found, or NULL, if not found. + */ +char *fw_getenv (char *name) +{ + char *env, *nxt; + + if (env_init ()) + return NULL; + + for (env = environment.data; *env; env = nxt + 1) { + char *val; + + for (nxt = env; *nxt; ++nxt) { + if (nxt >= &environment.data[ENV_SIZE]) { + fprintf (stderr, "## Error: " + "environment not terminated\n"); + return NULL; + } + } + val = envmatch (name, env); + if (!val) + continue; + return val; + } + return NULL; +} + +/* + * Print the current definition of one, or more, or all + * environment variables + */ +int fw_printenv (int argc, char *argv[]) +{ + char *env, *nxt; + int i, n_flag; + int rc = 0; + + if (env_init ()) + return -1; + + if (argc == 1) { /* Print all env variables */ + for (env = environment.data; *env; env = nxt + 1) { + for (nxt = env; *nxt; ++nxt) { + if (nxt >= &environment.data[ENV_SIZE]) { + fprintf (stderr, "## Error: " + "environment not terminated\n"); + return -1; + } + } + + printf ("%s\n", env); + } + return 0; + } + + if (strcmp (argv[1], "-n") == 0) { + n_flag = 1; + ++argv; + --argc; + if (argc != 2) { + fprintf (stderr, "## Error: " + "`-n' option requires exactly one argument\n"); + return -1; + } + } else { + n_flag = 0; + } + + for (i = 1; i < argc; ++i) { /* print single env variables */ + char *name = argv[i]; + char *val = NULL; + + for (env = environment.data; *env; env = nxt + 1) { + + for (nxt = env; *nxt; ++nxt) { + if (nxt >= &environment.data[ENV_SIZE]) { + fprintf (stderr, "## Error: " + "environment not terminated\n"); + return -1; + } + } + val = envmatch (name, env); + if (val) { + if (!n_flag) { + fputs (name, stdout); + putc ('=', stdout); + } + puts (val); + break; + } + } + if (!val) { + fprintf (stderr, "## Error: \"%s\" not defined\n", name); + rc = -1; + } + } + + return rc; +} + +/* + * Deletes or sets environment variables. Returns -1 and sets errno error codes: + * 0 - OK + * EINVAL - need at least 1 argument + * EROFS - certain variables ("ethaddr", "serial#") cannot be + * modified or deleted + * + */ +int fw_setenv (int argc, char *argv[]) +{ + int i, len; + char *env, *nxt; + char *oldval = NULL; + char *name; + + if (argc < 2) { + errno = EINVAL; + return -1; + } + + if (env_init ()) + return -1; + + name = argv[1]; + + /* + * search if variable with this name already exists + */ + for (nxt = env = environment.data; *env; env = nxt + 1) { + for (nxt = env; *nxt; ++nxt) { + if (nxt >= &environment.data[ENV_SIZE]) { + fprintf (stderr, "## Error: " + "environment not terminated\n"); + errno = EINVAL; + return -1; + } + } + if ((oldval = envmatch (name, env)) != NULL) + break; + } + + /* + * Delete any existing definition + */ + if (oldval) { + /* + * Ethernet Address and serial# can be set only once + */ + if ((strcmp (name, "ethaddr") == 0) || + (strcmp (name, "serial#") == 0)) { + fprintf (stderr, "Can't overwrite \"%s\"\n", name); + errno = EROFS; + return -1; + } + + if (*++nxt == '\0') { + *env = '\0'; + } else { + for (;;) { + *env = *nxt++; + if ((*env == '\0') && (*nxt == '\0')) + break; + ++env; + } + } + *++env = '\0'; + } + + /* Delete only ? */ + if (argc < 3) + goto WRITE_FLASH; + + /* + * Append new definition at the end + */ + for (env = environment.data; *env || *(env + 1); ++env); + if (env > environment.data) + ++env; + /* + * Overflow when: + * "name" + "=" + "val" +"\0\0" > CONFIG_ENV_SIZE - (env-environment) + */ + len = strlen (name) + 2; + /* add '=' for first arg, ' ' for all others */ + for (i = 2; i < argc; ++i) { + len += strlen (argv[i]) + 1; + } + if (len > (&environment.data[ENV_SIZE] - env)) { + fprintf (stderr, + "Error: environment overflow, \"%s\" deleted\n", + name); + return -1; + } + while ((*env = *name++) != '\0') + env++; + for (i = 2; i < argc; ++i) { + char *val = argv[i]; + + *env = (i == 2) ? '=' : ' '; + while ((*++env = *val++) != '\0'); + } + + /* end is marked with double '\0' */ + *++env = '\0'; + + WRITE_FLASH: + + /* + * Update CRC + */ + *environment.crc = crc32 (0, (uint8_t *) environment.data, ENV_SIZE); + + /* write environment back to flash */ + if (flash_io (O_RDWR)) { + fprintf (stderr, "Error: can't write fw_env to flash\n"); + return -1; + } + + return 0; +} + +/* + * Test for bad block on NAND, just returns 0 on NOR, on NAND: + * 0 - block is good + * > 0 - block is bad + * < 0 - failed to test + */ +static int flash_bad_block (int fd, uint8_t mtd_type, loff_t *blockstart) +{ + if (mtd_type == MTD_NANDFLASH) { + int badblock = ioctl (fd, MEMGETBADBLOCK, blockstart); + + if (badblock < 0) { + perror ("Cannot read bad block mark"); + return badblock; + } + + if (badblock) { +#ifdef DEBUG + fprintf (stderr, "Bad block at 0x%llx, " + "skipping\n", *blockstart); +#endif + return badblock; + } + } + + return 0; +} + +/* + * Read data from flash at an offset into a provided buffer. On NAND it skips + * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from + * the DEVOFFSET (dev) block. On NOR the loop is only run once. + */ +static int flash_read_buf (int dev, int fd, void *buf, size_t count, + off_t offset, uint8_t mtd_type) +{ + size_t blocklen; /* erase / write length - one block on NAND, + 0 on NOR */ + size_t processed = 0; /* progress counter */ + size_t readlen = count; /* current read length */ + off_t top_of_range; /* end of the last block we may use */ + off_t block_seek; /* offset inside the current block to the start + of the data */ + loff_t blockstart; /* running start of the current block - + MEMGETBADBLOCK needs 64 bits */ + int rc; + + /* + * Start of the first block to be read, relies on the fact, that + * erase sector size is always a power of 2 + */ + blockstart = offset & ~(DEVESIZE (dev) - 1); + + /* Offset inside a block */ + block_seek = offset - blockstart; + + if (mtd_type == MTD_NANDFLASH) { + /* + * NAND: calculate which blocks we are reading. We have + * to read one block at a time to skip bad blocks. + */ + blocklen = DEVESIZE (dev); + + /* + * To calculate the top of the range, we have to use the + * global DEVOFFSET (dev), which can be different from offset + */ + top_of_range = (DEVOFFSET (dev) & ~(blocklen - 1)) + + ENVSECTORS (dev) * blocklen; + + /* Limit to one block for the first read */ + if (readlen > blocklen - block_seek) + readlen = blocklen - block_seek; + } else { + blocklen = 0; + top_of_range = offset + count; + } + + /* This only runs once on NOR flash */ + while (processed < count) { + rc = flash_bad_block (fd, mtd_type, &blockstart); + if (rc < 0) /* block test failed */ + return -1; + + if (blockstart + block_seek + readlen > top_of_range) { + /* End of range is reached */ + fprintf (stderr, + "Too few good blocks within range\n"); + return -1; + } + + if (rc) { /* block is bad */ + blockstart += blocklen; + continue; + } + + /* + * If a block is bad, we retry in the next block at the same + * offset - see common/env_nand.c::writeenv() + */ + lseek (fd, blockstart + block_seek, SEEK_SET); + + rc = read (fd, buf + processed, readlen); + if (rc != readlen) { + fprintf (stderr, "Read error on %s: %s\n", + DEVNAME (dev), strerror (errno)); + return -1; + } +#ifdef DEBUG + fprintf (stderr, "Read 0x%x bytes at 0x%llx\n", + rc, blockstart + block_seek); +#endif + processed += readlen; + readlen = min (blocklen, count - processed); + block_seek = 0; + blockstart += blocklen; + } + + return processed; +} + +/* + * Write count bytes at offset, but stay within ENVSETCORS (dev) sectors of + * DEVOFFSET (dev). Similar to the read case above, on NOR we erase and write + * the whole data at once. + */ +static int flash_write_buf (int dev, int fd, void *buf, size_t count, + off_t offset, uint8_t mtd_type) +{ + void *data; + struct erase_info_user erase; + size_t blocklen; /* length of NAND block / NOR erase sector */ + size_t erase_len; /* whole area that can be erased - may include + bad blocks */ + size_t erasesize; /* erase / write length - one block on NAND, + whole area on NOR */ + size_t processed = 0; /* progress counter */ + size_t write_total; /* total size to actually write - excludinig + bad blocks */ + off_t erase_offset; /* offset to the first erase block (aligned) + below offset */ + off_t block_seek; /* offset inside the erase block to the start + of the data */ + off_t top_of_range; /* end of the last block we may use */ + loff_t blockstart; /* running start of the current block - + MEMGETBADBLOCK needs 64 bits */ + int rc; + + blocklen = DEVESIZE (dev); + + /* Erase sector size is always a power of 2 */ + top_of_range = (DEVOFFSET (dev) & ~(blocklen - 1)) + + ENVSECTORS (dev) * blocklen; + + erase_offset = offset & ~(blocklen - 1); + + /* Maximum area we may use */ + erase_len = top_of_range - erase_offset; + + blockstart = erase_offset; + /* Offset inside a block */ + block_seek = offset - erase_offset; + + /* + * Data size we actually have to write: from the start of the block + * to the start of the data, then count bytes of data, and to the + * end of the block + */ + write_total = (block_seek + count + blocklen - 1) & ~(blocklen - 1); + + /* + * Support data anywhere within erase sectors: read out the complete + * area to be erased, replace the environment image, write the whole + * block back again. + */ + if (write_total > count) { + data = malloc (erase_len); + if (!data) { + fprintf (stderr, + "Cannot malloc %u bytes: %s\n", + erase_len, strerror (errno)); + return -1; + } + + rc = flash_read_buf (dev, fd, data, write_total, erase_offset, + mtd_type); + if (write_total != rc) + return -1; + + /* Overwrite the old environment */ + memcpy (data + block_seek, buf, count); + } else { + /* + * We get here, iff offset is block-aligned and count is a + * multiple of blocklen - see write_total calculation above + */ + data = buf; + } + + if (mtd_type == MTD_NANDFLASH) { + /* + * NAND: calculate which blocks we are writing. We have + * to write one block at a time to skip bad blocks. + */ + erasesize = blocklen; + } else { + erasesize = erase_len; + } + + erase.length = erasesize; + + /* This only runs once on NOR flash */ + while (processed < write_total) { + rc = flash_bad_block (fd, mtd_type, &blockstart); + if (rc < 0) /* block test failed */ + return rc; + + if (blockstart + erasesize > top_of_range) { + fprintf (stderr, "End of range reached, aborting\n"); + return -1; + } + + if (rc) { /* block is bad */ + blockstart += blocklen; + continue; + } + + erase.start = blockstart; + ioctl (fd, MEMUNLOCK, &erase); + + if (ioctl (fd, MEMERASE, &erase) != 0) { + fprintf (stderr, "MTD erase error on %s: %s\n", + DEVNAME (dev), + strerror (errno)); + return -1; + } + + if (lseek (fd, blockstart, SEEK_SET) == -1) { + fprintf (stderr, + "Seek error on %s: %s\n", + DEVNAME (dev), strerror (errno)); + return -1; + } + +#ifdef DEBUG + printf ("Write 0x%x bytes at 0x%llx\n", erasesize, blockstart); +#endif + if (write (fd, data + processed, erasesize) != erasesize) { + fprintf (stderr, "Write error on %s: %s\n", + DEVNAME (dev), strerror (errno)); + return -1; + } + + ioctl (fd, MEMLOCK, &erase); + + processed += blocklen; + block_seek = 0; + blockstart += blocklen; + } + + if (write_total > count) + free (data); + + return processed; +} + +/* + * Set obsolete flag at offset - NOR flash only + */ +static int flash_flag_obsolete (int dev, int fd, off_t offset) +{ + int rc; + + /* This relies on the fact, that obsolete_flag == 0 */ + rc = lseek (fd, offset, SEEK_SET); + if (rc < 0) { + fprintf (stderr, "Cannot seek to set the flag on %s \n", + DEVNAME (dev)); + return rc; + } + rc = write (fd, &obsolete_flag, sizeof (obsolete_flag)); + if (rc < 0) + perror ("Could not set obsolete flag"); + + return rc; +} + +static int flash_write (int fd_current, int fd_target, int dev_target) +{ + int rc; + + switch (environment.flag_scheme) { + case FLAG_NONE: + break; + case FLAG_INCREMENTAL: + (*environment.flags)++; + break; + case FLAG_BOOLEAN: + *environment.flags = active_flag; + break; + default: + fprintf (stderr, "Unimplemented flash scheme %u \n", + environment.flag_scheme); + return -1; + } + +#ifdef DEBUG + printf ("Writing new environment at 0x%lx on %s\n", + DEVOFFSET (dev_target), DEVNAME (dev_target)); +#endif + rc = flash_write_buf (dev_target, fd_target, environment.image, + CONFIG_ENV_SIZE, DEVOFFSET (dev_target), + DEVTYPE(dev_target)); + if (rc < 0) + return rc; + + if (environment.flag_scheme == FLAG_BOOLEAN) { + /* Have to set obsolete flag */ + off_t offset = DEVOFFSET (dev_current) + + offsetof (struct env_image_redundant, flags); +#ifdef DEBUG + printf ("Setting obsolete flag in environment at 0x%lx on %s\n", + DEVOFFSET (dev_current), DEVNAME (dev_current)); +#endif + flash_flag_obsolete (dev_current, fd_current, offset); + } + + return 0; +} + +static int flash_read (int fd) +{ + struct mtd_info_user mtdinfo; + int rc; + + rc = ioctl (fd, MEMGETINFO, &mtdinfo); + if (rc < 0) { + perror ("Cannot get MTD information"); + return -1; + } + + if (mtdinfo.type != MTD_NORFLASH && mtdinfo.type != MTD_NANDFLASH) { + fprintf (stderr, "Unsupported flash type %u\n", mtdinfo.type); + return -1; + } + + DEVTYPE(dev_current) = mtdinfo.type; + + rc = flash_read_buf (dev_current, fd, environment.image, CONFIG_ENV_SIZE, + DEVOFFSET (dev_current), mtdinfo.type); + + return (rc != CONFIG_ENV_SIZE) ? -1 : 0; +} + +static int flash_io (int mode) +{ + int fd_current, fd_target, rc, dev_target; + + /* dev_current: fd_current, erase_current */ + fd_current = open (DEVNAME (dev_current), mode); + if (fd_current < 0) { + fprintf (stderr, + "Can't open %s: %s\n", + DEVNAME (dev_current), strerror (errno)); + return -1; + } + + if (mode == O_RDWR) { + if (HaveRedundEnv) { + /* switch to next partition for writing */ + dev_target = !dev_current; + /* dev_target: fd_target, erase_target */ + fd_target = open (DEVNAME (dev_target), mode); + if (fd_target < 0) { + fprintf (stderr, + "Can't open %s: %s\n", + DEVNAME (dev_target), + strerror (errno)); + rc = -1; + goto exit; + } + } else { + dev_target = dev_current; + fd_target = fd_current; + } + + rc = flash_write (fd_current, fd_target, dev_target); + + if (HaveRedundEnv) { + if (close (fd_target)) { + fprintf (stderr, + "I/O error on %s: %s\n", + DEVNAME (dev_target), + strerror (errno)); + rc = -1; + } + } + } else { + rc = flash_read (fd_current); + } + +exit: + if (close (fd_current)) { + fprintf (stderr, + "I/O error on %s: %s\n", + DEVNAME (dev_current), strerror (errno)); + return -1; + } + + return rc; +} + +/* + * s1 is either a simple 'name', or a 'name=value' pair. + * s2 is a 'name=value' pair. + * If the names match, return the value of s2, else NULL. + */ + +static char *envmatch (char * s1, char * s2) +{ + + while (*s1 == *s2++) + if (*s1++ == '=') + return s2; + if (*s1 == '\0' && *(s2 - 1) == '=') + return s2; + return NULL; +} + +/* + * Prevent confusion if running from erased flash memory + */ +static int env_init (void) +{ + int crc0, crc0_ok; + char flag0; + void *addr0; + + int crc1, crc1_ok; + char flag1; + void *addr1; + + struct env_image_single *single; + struct env_image_redundant *redundant; + + if (parse_config ()) /* should fill envdevices */ + return -1; + + addr0 = calloc (1, CONFIG_ENV_SIZE); + if (addr0 == NULL) { + fprintf (stderr, + "Not enough memory for environment (%ld bytes)\n", + CONFIG_ENV_SIZE); + return -1; + } + + /* read environment from FLASH to local buffer */ + environment.image = addr0; + + if (HaveRedundEnv) { + redundant = addr0; + environment.crc = &redundant->crc; + environment.flags = &redundant->flags; + environment.data = redundant->data; + } else { + single = addr0; + environment.crc = &single->crc; + environment.flags = NULL; + environment.data = single->data; + } + + dev_current = 0; + if (flash_io (O_RDONLY)) + return -1; + + crc0 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE); + crc0_ok = (crc0 == *environment.crc); + if (!HaveRedundEnv) { + if (!crc0_ok) { + fprintf (stderr, + "Warning: Bad CRC, using default environment\n"); + memcpy(environment.data, default_environment, sizeof default_environment); + } + } else { + flag0 = *environment.flags; + + dev_current = 1; + addr1 = calloc (1, CONFIG_ENV_SIZE); + if (addr1 == NULL) { + fprintf (stderr, + "Not enough memory for environment (%ld bytes)\n", + CONFIG_ENV_SIZE); + return -1; + } + redundant = addr1; + + /* + * have to set environment.image for flash_read(), careful - + * other pointers in environment still point inside addr0 + */ + environment.image = addr1; + if (flash_io (O_RDONLY)) + return -1; + + /* Check flag scheme compatibility */ + if (DEVTYPE(dev_current) == MTD_NORFLASH && + DEVTYPE(!dev_current) == MTD_NORFLASH) { + environment.flag_scheme = FLAG_BOOLEAN; + } else if (DEVTYPE(dev_current) == MTD_NANDFLASH && + DEVTYPE(!dev_current) == MTD_NANDFLASH) { + environment.flag_scheme = FLAG_INCREMENTAL; + } else { + fprintf (stderr, "Incompatible flash types!\n"); + return -1; + } + + crc1 = crc32 (0, (uint8_t *) redundant->data, ENV_SIZE); + crc1_ok = (crc1 == redundant->crc); + flag1 = redundant->flags; + + if (crc0_ok && !crc1_ok) { + dev_current = 0; + } else if (!crc0_ok && crc1_ok) { + dev_current = 1; + } else if (!crc0_ok && !crc1_ok) { + fprintf (stderr, + "Warning: Bad CRC, using default environment\n"); + memcpy (environment.data, default_environment, + sizeof default_environment); + dev_current = 0; + } else { + switch (environment.flag_scheme) { + case FLAG_BOOLEAN: + if (flag0 == active_flag && + flag1 == obsolete_flag) { + dev_current = 0; + } else if (flag0 == obsolete_flag && + flag1 == active_flag) { + dev_current = 1; + } else if (flag0 == flag1) { + dev_current = 0; + } else if (flag0 == 0xFF) { + dev_current = 0; + } else if (flag1 == 0xFF) { + dev_current = 1; + } else { + dev_current = 0; + } + break; + case FLAG_INCREMENTAL: + if ((flag0 == 255 && flag1 == 0) || + flag1 > flag0) + dev_current = 1; + else if ((flag1 == 255 && flag0 == 0) || + flag0 > flag1) + dev_current = 0; + else /* flags are equal - almost impossible */ + dev_current = 0; + break; + default: + fprintf (stderr, "Unknown flag scheme %u \n", + environment.flag_scheme); + return -1; + } + } + + /* + * If we are reading, we don't need the flag and the CRC any + * more, if we are writing, we will re-calculate CRC and update + * flags before writing out + */ + if (dev_current) { + environment.image = addr1; + environment.crc = &redundant->crc; + environment.flags = &redundant->flags; + environment.data = redundant->data; + free (addr0); + } else { + environment.image = addr0; + /* Other pointers are already set */ + free (addr1); + } + } + return 0; +} + + +static int parse_config () +{ + struct stat st; + +#if defined(CONFIG_FILE) + /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */ + if (get_config (CONFIG_FILE)) { + fprintf (stderr, + "Cannot parse config file: %s\n", strerror (errno)); + return -1; + } +#else + strcpy (DEVNAME (0), DEVICE1_NAME); + DEVOFFSET (0) = DEVICE1_OFFSET; + ENVSIZE (0) = ENV1_SIZE; + DEVESIZE (0) = DEVICE1_ESIZE; + ENVSECTORS (0) = DEVICE1_ENVSECTORS; +#ifdef HAVE_REDUND + strcpy (DEVNAME (1), DEVICE2_NAME); + DEVOFFSET (1) = DEVICE2_OFFSET; + ENVSIZE (1) = ENV2_SIZE; + DEVESIZE (1) = DEVICE2_ESIZE; + ENVSECTORS (1) = DEVICE2_ENVSECTORS; + HaveRedundEnv = 1; +#endif +#endif + if (stat (DEVNAME (0), &st)) { + fprintf (stderr, + "Cannot access MTD device %s: %s\n", + DEVNAME (0), strerror (errno)); + return -1; + } + + if (HaveRedundEnv && stat (DEVNAME (1), &st)) { + fprintf (stderr, + "Cannot access MTD device %s: %s\n", + DEVNAME (1), strerror (errno)); + return -1; + } + return 0; +} + +#if defined(CONFIG_FILE) +static int get_config (char *fname) +{ + FILE *fp; + int i = 0; + int rc; + char dump[128]; + + fp = fopen (fname, "r"); + if (fp == NULL) + return -1; + + while (i < 2 && fgets (dump, sizeof (dump), fp)) { + /* Skip incomplete conversions and comment strings */ + if (dump[0] == '#') + continue; + + rc = sscanf (dump, "%s %lx %lx %lx %lx", + DEVNAME (i), + &DEVOFFSET (i), + &ENVSIZE (i), + &DEVESIZE (i), + &ENVSECTORS (i)); + + if (rc < 4) + continue; + + if (rc < 5) + /* Default - 1 sector */ + ENVSECTORS (i) = 1; + + i++; + } + fclose (fp); + + HaveRedundEnv = i - 1; + if (!i) { /* No valid entries found */ + errno = EINVAL; + return -1; + } else + return 0; +} +#endif |