diff options
Diffstat (limited to 'flash_erase.c')
| -rw-r--r-- | flash_erase.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/flash_erase.c b/flash_erase.c new file mode 100644 index 0000000..870cf40 --- /dev/null +++ b/flash_erase.c @@ -0,0 +1,188 @@ +/* + * flash_erase.c -- erase parts of a MTD device +*/ + +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> +#include <fcntl.h> +#include <time.h> +#include <sys/ioctl.h> +#include <sys/mount.h> +#include <mtd/mtd-user.h> + +int region_erase(int Fd, int start, int count, int unlock, int regcount) +{ + int i, j; + region_info_t * reginfo; + + reginfo = calloc(regcount, sizeof(region_info_t)); + + for(i = 0; i < regcount; i++) + { + reginfo[i].regionindex = i; + if(ioctl(Fd,MEMGETREGIONINFO,&(reginfo[i])) != 0) + return 8; + else + printf("Region %d is at %d of %d sector and with sector " + "size %x\n", i, reginfo[i].offset, reginfo[i].numblocks, + reginfo[i].erasesize); + } + + // We have all the information about the chip we need. + + for(i = 0; i < regcount; i++) + { //Loop through the regions + region_info_t * r = &(reginfo[i]); + + if((start >= reginfo[i].offset) && + (start < (r->offset + r->numblocks*r->erasesize))) + break; + } + + if(i >= regcount) + { + printf("Starting offset %x not within chip.\n", start); + return 8; + } + + //We are now positioned within region i of the chip, so start erasing + //count sectors from there. + + for(j = 0; (j < count)&&(i < regcount); j++) + { + erase_info_t erase; + region_info_t * r = &(reginfo[i]); + + erase.start = start; + erase.length = r->erasesize; + + if(unlock != 0) + { //Unlock the sector first. + if(ioctl(Fd, MEMUNLOCK, &erase) != 0) + { + perror("\nMTD Unlock failure"); + close(Fd); + return 8; + } + } + printf("\rPerforming Flash Erase of length %u at offset 0x%x", + erase.length, erase.start); + fflush(stdout); + if(ioctl(Fd, MEMERASE, &erase) != 0) + { + perror("\nMTD Erase failure"); + close(Fd); + return 8; + } + + + start += erase.length; + if(start >= (r->offset + r->numblocks*r->erasesize)) + { //We finished region i so move to region i+1 + printf("\nMoving to region %d\n", i+1); + i++; + } + } + + printf(" done\n"); + + return 0; +} + +int non_region_erase(int Fd, int start, int count, int unlock) +{ + mtd_info_t meminfo; + + if (ioctl(Fd,MEMGETINFO,&meminfo) == 0) + { + erase_info_t erase; + + erase.start = start; + + erase.length = meminfo.erasesize; + + for (; count > 0; count--) { + printf("\rPerforming Flash Erase of length %u at offset 0x%x", + erase.length, erase.start); + fflush(stdout); + + if(unlock != 0) + { + //Unlock the sector first. + printf("\rPerforming Flash unlock at offset 0x%x",erase.start); + if(ioctl(Fd, MEMUNLOCK, &erase) != 0) + { + perror("\nMTD Unlock failure"); + close(Fd); + return 8; + } + } + + if (ioctl(Fd,MEMERASE,&erase) != 0) + { + perror("\nMTD Erase failure"); + close(Fd); + return 8; + } + erase.start += meminfo.erasesize; + } + printf(" done\n"); + } + return 0; +} + +int main(int argc,char *argv[]) +{ + int regcount; + int Fd; + int start; + int count; + int unlock; + int res = 0; + + if (1 >= argc) + { + fprintf(stderr,"You must specify a device\n"); + return 16; + } + + if (argc > 2) + start = strtol(argv[2], NULL, 0); + else + start = 0; + + if (argc > 3) + count = strtol(argv[3], NULL, 0); + else + count = 1; + + if(argc > 4) + unlock = strtol(argv[4], NULL, 0); + else + unlock = 0; + + + // Open and size the device + if ((Fd = open(argv[1],O_RDWR)) < 0) + { + fprintf(stderr,"File open error\n"); + return 8; + } + + printf("Erase Total %d Units\n", count); + + if (ioctl(Fd,MEMGETREGIONCOUNT,®count) == 0) + { + if(regcount == 0) + { + res = non_region_erase(Fd, start, count, unlock); + } + else + { + res = region_erase(Fd, start, count, unlock, regcount); + } + } + + return res; +} |