OSPI NOR Flash

This guide will show you how to access the 64MB NOR Flash featured on the phyCORE-i.MX8X development kit carrier board. The NOR Flash is accessible through the OSPI interface and can also be used as an alternative boot source.

Available NOR Partitions

Make sure the NOR interface was initialized properly.

Target (Linux)

mtdinfo

Expected Output

Count of MTD devices:           1
Present MTD devices:            mtd0
Sysfs interface supported:      yes

View basic partition information.
Target (Linux)
```
cat /proc/mtd
```

Expected Output

dev:    size   erasesize  name
mtd0: 04000000 00020000 "5d120000.spi"

More detailed information can be viewed using the “mtdinfo” command on a specific partition.
Target (Linux)
```
mtdinfo /dev/mtd0
```

Expected Output

mtd0
Name:                           5d120000.spi
Type:                           nor
Eraseblock size:                131072 bytes, 128.0 KiB
Amount of eraseblocks:          512 (67108864 bytes, 64.0 MiB)
Minimum input/output unit size: 1 byte
Sub-page size:                  1 byte
Character device major/minor:   90:0
Bad blocks are allowed:         false
Device is writable:             true

Write to OSPI

Create a random file equal to the size of the /dev/mtd0 partition (512 kBytes).
Target (Linux)
```
dd if=/dev/urandom of=test.dat bs=1k count=512
```

Expected Output

512+0 records in
512+0 records out
524288 bytes (524 kB, 512 KiB) copied, 0.0265253 s, 19.8 MB/s

Copy the generated file to the mtd0 partition using the “flashcp” command.
Target (Linux)
```
flashcp -v test.dat /dev/mtd0
```

Expected Output

Erasing blocks: 4/4 (100%)
Writing data: 512k/512k (100%)
Verifying data: 512k/512k (100%)

Reading from OSPI

Dump the contents of /dev/mtd0 partition to a new file:
Target (Linux)
```
dd if=/dev/mtd0 of=read.dat bs=1k count=512
```

Expected Output

512+0 records in
512+0 records out
524288 bytes (524 kB, 512 KiB) copied, 0.167633 s, 3.1 MB/s

Make sure the output file was not corrupted during the transfer using md5sum.
Target (Linux)
```
md5sum test.dat read.dat
```

Expected Output

3497f295076c7ef96443b109ab9be333  test.dat
3497f295076c7ef96443b109ab9be333  read.dat