diff options
author | Michael Walle <michael@walle.cc> | 2021-03-16 11:40:15 +0100 |
---|---|---|
committer | David Oberhollenzer <david.oberhollenzer@sigma-star.at> | 2021-06-12 17:16:33 +0200 |
commit | 51d6820f49ca4a203cf30dd99bc83f25d569eb4b (patch) | |
tree | f7955ee2d8d27fb2b1325ad583ffce6f409a4fab /misc-utils | |
parent | 2ca0bbf296d6f7ce51b8255347c7fd08afa33651 (diff) |
mtd-utils: Add flash_otp_erase
On some SPI NOR flashes you can actually erase the OTP region until its
fully locked. Add a small utility for that.
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'misc-utils')
-rw-r--r-- | misc-utils/Makemodule.am | 4 | ||||
-rw-r--r-- | misc-utils/flash_otp_erase.c | 64 |
2 files changed, 67 insertions, 1 deletions
diff --git a/misc-utils/Makemodule.am b/misc-utils/Makemodule.am index b15c119..bc69b1c 100644 --- a/misc-utils/Makemodule.am +++ b/misc-utils/Makemodule.am @@ -32,6 +32,8 @@ flash_otp_dump_SOURCES = misc-utils/flash_otp_dump.c flash_otp_lock_SOURCES = misc-utils/flash_otp_lock.c +flash_otp_erase_SOURCES = misc-utils/flash_otp_erase.c + flash_otp_write_SOURCES = misc-utils/flash_otp_write.c flashcp_SOURCES = misc-utils/flashcp.c @@ -43,7 +45,7 @@ sbin_PROGRAMS += \ ftl_format doc_loadbios ftl_check mtd_debug docfdisk \ serve_image recv_image fectest flash_erase flash_lock \ flash_unlock flash_otp_info flash_otp_dump flash_otp_lock \ - flash_otp_write flashcp mtdpart + flash_otp_erase flash_otp_write flashcp mtdpart MISC_SH = \ misc-utils/flash_eraseall diff --git a/misc-utils/flash_otp_erase.c b/misc-utils/flash_otp_erase.c new file mode 100644 index 0000000..771e230 --- /dev/null +++ b/misc-utils/flash_otp_erase.c @@ -0,0 +1,64 @@ +/* + * flash_otp_erase.c -- erase area of One-Time-Program data + */ + +#define PROGRAM_NAME "flash_otp_erase" + +#include <stdio.h> +#include <unistd.h> +#include <fcntl.h> +#include <string.h> +#include <stdlib.h> +#include <errno.h> +#include <sys/ioctl.h> + +#include <mtd/mtd-user.h> +#include "common.h" + +int main(int argc,char *argv[]) +{ + int fd, val, ret, offset, size; + struct otp_info info; + char *p; + + if (argc != 5 || strcmp(argv[1], "-u")) { + fprintf(stderr, "Usage: %s -u <device> <offset> <size>\n", PROGRAM_NAME); + fprintf(stderr, "offset and size must match on OTP region boundaries\n"); + return EINVAL; + } + + fd = open(argv[2], O_WRONLY); + if (fd < 0) { + perror(argv[2]); + return errno; + } + + val = MTD_OTP_USER; + ret = ioctl(fd, OTPSELECT, &val); + if (ret < 0) { + perror("OTPSELECT"); + return errno; + } + + offset = strtoul(argv[3], &p, 0); + if (argv[3][0] == 0 || *p != 0) { + fprintf(stderr, "%s: bad offset value\n", PROGRAM_NAME); + return ERANGE; + } + + size = strtoul(argv[4], &p, 0); + if (argv[4][0] == 0 || *p != 0) { + fprintf(stderr, "%s: bad size value\n", PROGRAM_NAME); + return ERANGE; + } + + info.start = offset; + info.length = size; + ret = ioctl(fd, OTPERASE, &info); + if (ret < 0) { + perror("OTPERASE"); + return errno; + } + + return 0; +} |