...
Partition name | Device name | Address range | Size | Attributes | Purpose |
|---|---|---|---|---|---|
boot | /dev/mtd0 | 0x0000 0000 - 0x00F FFFF | 0x0010 0000 | read/write | bootloader + environment Environment: last 8KiB |
failsafe | /dev/mtd1 | 0x0010 0000 - 0x003F BFFF | 0x002F C000 | read/write | user partition (free for customer) 3MiB minus 16k MFG data |
reserved | /dev/mtd2 | 0x003F C000 - 0x003F FFFF | 0x0000 4000 | read only | MFG (manufacturing data) |
Access the SPI flash from linux kernel
...
root@cgtqmx6:~# ls -lad /dev/mtd*crw------- 1 root root 90, 0 Feb 7 06:40 /dev/mtd0crw------- 1 root root 90, 1 Feb 7 06:40 /dev/mtd0rocrw------- 1 root root 90, 2 Feb 7 06:40 /dev/mtd1crw------- 1 root root 90, 3 Feb 7 06:40 /dev/mtd1rocrw------- 1 root root 90, 4 Feb 7 06:40 /dev/mtd2crw------- 1 root root 90, 5 Feb 7 06:40 /dev/mtd2robrw-rw---- 1 root disk 31, 0 Feb 7 06:40 /dev/mtdblock0brw-rw---- 1 root disk 31, 1 Feb 7 06:40 /dev/mtdblock1brw-rw---- 1 root disk 31, 2 Feb 7 06:40 /dev/mtdblock2
Example howto : how to format user partition with JFF2 and mount it:
...
Access the SPI flash from u-boot
Example to : clear u-boot partition on SPI flash in from u-boot command line:
=> sf probe SF: Detected w25q64dw with page size 256 Bytes, erase size 4 KiB, total 8 MiB
...