SPI

There are two SPI interfaces on conga-QMX6 modules:

Hardware name	Device name (linux)	Device name (u-boot)	Purpose	Remarks

Hardware name	Device name (linux)	Device name (u-boot)	Purpose	Remarks
ecspi1: spi@2008000	/dev/mtd<n>	0	exclusive use for onboard SPI flash	<n> is the flash partition number and in the range [0 .. 2]
ecspi3: spi@2010000	depends on device	not supported	Q7 SPI-interface

Q7 SPI interface

Supports two chip select lines on Q7-pin 200 (CS0#) and 202 (CS1#)
on conga-QEVAL: U4 can be equipped with an SPI flash chip

Onboard SPI interface

Exclusive for SPI-NOR flash, see SPI NOR-Flash Organization for details:

SPI NOR-Flash Organization

Flash has a size of 4MiB, divided into three partitions:

Partition name	Device name	Address range	Size	Attributes	Purpose

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

Verify flash detection:

root@cgtqmx6:~# cat /proc/mtd
dev: size erasesize name
mtd0: 00100000 00001000 "bootloader"
mtd1: 002fc000 00001000 "user"
mtd2: 00004000 00001000 "reserved"

Check character and block devices used for different flash partitions:

root@cgtqmx6:~# ls -lad /dev/mtd*
crw------- 1 root root 90, 0 Feb 7 06:40 /dev/mtd0
crw------- 1 root root 90, 1 Feb 7 06:40 /dev/mtd0ro
crw------- 1 root root 90, 2 Feb 7 06:40 /dev/mtd1
crw------- 1 root root 90, 3 Feb 7 06:40 /dev/mtd1ro
crw------- 1 root root 90, 4 Feb 7 06:40 /dev/mtd2
crw------- 1 root root 90, 5 Feb 7 06:40 /dev/mtd2ro
brw-rw---- 1 root disk 31, 0 Feb 7 06:40 /dev/mtdblock0
brw-rw---- 1 root disk 31, 1 Feb 7 06:40 /dev/mtdblock1
brw-rw---- 1 root disk 31, 2 Feb 7 06:40 /dev/mtdblock2

Example: how to format user partition with JFF2 and mount it:

root@cgtqmx6:~# flash_erase -j /dev/mtd1 0 0

root@cgtqmx6:~# mount -t jffs2 /dev/mtdblock1 /mnt

Access the SPI flash from u-boot

Example: clear u-boot partition on SPI flash from u-boot command line:

=> sf probe
SF: Detected w25q64dw with page size 256 Bytes, erase size 4 KiB, total 8 MiB

=> sf erase 0 100000
SF: 1048576 bytes @ 0x0 Erased: OK

ATTENTION:

After clearing the uboot partition, the module won't boot any longer! Do a clean firmware update afterwards with uuu tool in recovery mode