MediaTek LinkIt Smart 7688 with OpenWrt

Flash Layout

[    0.290000] spi-mt7621 10000b00.spi: sys_freq: 193333333
[    0.300000] m25p80 spi32766.0: w25q128 (16384 Kbytes)
[    0.300000] m25p80 spi32766.0: using chunked io
[    0.310000] 4 ofpart partitions found on MTD device spi32766.0
[    0.310000] Creating 4 MTD partitions on "spi32766.0":
[    0.320000] 0x000000000000-0x000000030000 : "u-boot"
[    0.320000] 0x000000030000-0x000000040000 : "u-boot-env"
[    0.330000] 0x000000040000-0x000000050000 : "factory"
[    0.340000] 0x000000050000-0x000001000000 : "firmware"
[    0.370000] 2 uimage-fw partitions found on MTD device firmware
[    0.380000] 0x000000050000-0x000000169d29 : "kernel"
[    0.390000] 0x000000169d29-0x000001000000 : "rootfs"
[    0.390000] mtd: device 5 (rootfs) set to be root filesystem
[    0.400000] 1 squashfs-split partitions found on MTD device rootfs
[    0.400000] 0x000000560000-0x000001000000 : "rootfs_data"
[    0.420000] ralink_soc_eth 10100000.ethernet eth0: ralink at 0xb0100000, irq 5

root@Widora:/# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00030000 00010000 "u-boot"
mtd1: 00010000 00010000 "u-boot-env"
mtd2: 00010000 00010000 "factory"
mtd3: 00fb0000 00010000 "firmware"
mtd4: 00119d29 00010000 "kernel"
mtd5: 00e962d7 00010000 "rootfs"
mtd6: 00aa0000 00010000 "rootfs_data"

root@Widora:/# mount
rootfs on / type rootfs (rw)
/dev/root on /rom type squashfs (ro,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,noatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,noatime)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noatime)
/dev/mtdblock6 on /overlay type jffs2 (rw,noatime)
overlayfs:/overlay on / type overlay (rw,noatime,lowerdir=/,upperdir=/overlay/upper,workdir=/overlay/work)
tmpfs on /dev type tmpfs (rw,nosuid,relatime,size=512k,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,mode=600)
debugfs on /sys/kernel/debug type debugfs (rw,noatime)
mountd(pid1036) on /tmp/run/mountd type autofs (rw,relatime,fd=5,pgrp=1033,timeout=60,minproto=5,maxproto=5,indirect)

https://wiki.openwrt.org/doc/techref/flash.layout

Backup Factory Data

In Target

-> check mtd partitions
root@Widora:/# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00030000 00010000 "u-boot"
mtd1: 00010000 00010000 "u-boot-env"
mtd2: 00010000 00010000 "factory"
mtd3: 00fb0000 00010000 "firmware"
mtd4: 00119d29 00010000 "kernel"
mtd5: 00e962d7 00010000 "rootfs"

-> backup factory partition
root@Widora:/# dd if=/dev/mtd2 of=/tmp/factory.backup.bin
128+0 records in
128+0 records out

-> set network (connect board to router/switch with cable)
root@Widora:/# ifconfig br-lan 192.168.31.224
root@Widora:/# ping 192.168.31.1
PING 192.168.31.1 (192.168.31.1): 56 data bytes
64 bytes from 192.168.31.1: seq=0 ttl=64 time=1.009 ms
64 bytes from 192.168.31.1: seq=1 ttl=64 time=0.481 ms
^C
--- 192.168.31.1 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.481/0.745/1.009 ms

-> set root password
root@Widora:/# passwd root
Changing password for root
New password:				(-> enter password, can be simple leave as blank)
Bad password: too short
Retype password:
Password for root changed by root

Host Side

$ scp root@192.168.31.xxx:/tmp/factory.backup.bin .
root@192.168.31.224's password: 
factory.backup.bin                     100%   64KB  64.0KB/s   00:00  
$ cp factory.backup.bin /to/safe/storage

Flashing Image

via `tftp`

Setup tftp server (http://askubuntu.com/questions/201505/how-do-i-install-and-run-a-tftp-server)

Ignore if setup already.
Make your own image
Put image to tftp server folder (/tftpboot)
```
$ cp -f bin/ramips/openwrt-ramips-mt7688-LinkIt7688-squashfs-sysupgrade.bin /tftpboot/w0
```
Suggest to use short file name in tftp server folder for convenient use in uboot.

Power on target and enter uboot tftp boot mode

Continuing normal boot...

Please choose the operation:
   1: Load system code to SDRAM via TFTP.
   2: Load system code then write to Flash via TFTP.
   3: Boot system code via Flash (default).
   4: Entr boot command line interface.
   5: Entr ALL LED test mode.
   6: Entr Web failsafe mode.
   7: Load Boot Loader code then write to Flash via Serial.
   9: Load Boot Loader code then write to Flash via TFTP.

Select 1 or 2 once you see above output in terminal.

Connect target board to router with network cable

Setup IP address (both target and tftp server) and image file

 Please Input new ones /or Ctrl-C to discard
        Input device IP (192.168.31.224) ==:192.168.31.224
        Input server IP (192.168.31.59) ==:192.168.31.59
        Input Linux Kernel filename (w0) ==:w0

Start loading image via tftp and boot

 netboot_common, argc= 3

 NetTxPacket = 0x87FE6D00

 KSEG1ADDR(NetTxPacket) = 0xA7FE6D00

 NetLoop,call eth_halt !

 NetLoop,call eth_init !
Trying Eth0 (10/100-M)

 Waitting for RX_DMA_BUSY status Start... done


 ETH_STATE_ACTIVE!!
TFTP from server 192.168.31.59; our IP address is 192.168.31.224
Filename 'w0'.

 TIMEOUT_COUNT=10,Load address: 0x80a00000
Loading: Got ARP REPLY, set server/gtwy eth addr (1c:1b:0d:0a:db:c6)
Got it
#################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################

via `sysupgrade`

In Target

Setup target ip address and account

-> set network (connect board to router/switch with cable)
root@Widora:/# ifconfig br-lan 192.168.31.224

-> check network setting
root@Widora:/# ping 192.168.31.1
PING 192.168.31.1 (192.168.31.1): 56 data bytes
64 bytes from 192.168.31.1: seq=0 ttl=64 time=1.009 ms
64 bytes from 192.168.31.1: seq=1 ttl=64 time=0.481 ms
^C
--- 192.168.31.1 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.481/0.745/1.009 ms

-> set root password
root@Widora:/# passwd root
Changing password for root
New password:				(-> enter password, can be simple leave as blank)
Bad password: too short
Retype password:
Password for root changed by root

Copy image to target

using scp

$ scp bin/ramips/openwrt-ramips-mt7688-LinkIt7688-squashfs-sysupgrade.bin root@192.168.31.224:/tmp/ow-upgrade.bin
root@192.168.31.224's password: 
openwrt-ramips-mt7688-LinkIt7688-squashfs-sysupgrade.bin                            100%   14MB   2.3MB/s   00:06

using nc

# on linux pc
$ cat bin/ramips/openwrt-ramips-mt7688-LinkIt7688-squashfs-sysupgrade.bin | pv -b | nc -l -p 12345

# on target
$ nc 192.168.1.111 12345 > /tmp/ow-upgrade.bin

NOTE:

Port 12345 and IP address 192.168.1.111 are just examples.
The command pv -b is optional for tracking progress but maybe you have to install pv to your system previously.

Write image to flash

root@mylinkit:/# sysupgrade -v /tmp/ow-upgrade.bin
Saving config files...
etc/avahi/avahi-daemon.conf
etc/avrdude.conf
...
etc/udev/udev.conf
killall: watchdog: no process killed
Sending TERM to remaining processes ... uhttpd smbd nmbd avahi-daemon mountd ntpd dnsmasq ubusd logd rpcd netifd odhcpd
Sending KILL to remaining processes ...
Switching to ramdisk...
Performing system upgrade...
Unlocking firmware ...

Writing from <stdin> to firmware ...  [w]
Appending jffs2 data from /tmp/sysupgrade.tgz to firmwar
Upgrade completed
Rebooting system...
[ 2186.460000] reboot: Restarting system

Target will automatically reboot after flashing done

via `mtd`

Same steps as sysupgraade except:

$ mtd -r write /tmp/ow-upgrade.bin firmware

https://wiki.openwrt.org/doc/howto/generic.sysupgrade

Using SDK

Build

$ tar jxvf OpenWrt-SDK-ramips-mt7688_gcc-4.8-linaro_uClibc-0.9.33.2.Linux-x86_64.tar.bz2
$ cd OpenWrt-SDK-ramips-mt7688_gcc-4.8-linaro_uClibc-0.9.33.2.Linux-x86_64
$ git clone git@git.muabaobao.com:depot/mua-ow-hello.git package/mua-ow-hello
$ make package/mua-ow-hello/{download,prepare,compile}

# check result
$ ls build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/
function_key  function_key.c  function_key.o  ipkg-ramips_24kec  Makefile
$ ls bin/ramips/packages/base
function_key_1.0-1_ramips_24kec.ipk

Run and Debug

Push execute program to target

$ scp build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/function_key root@192.168.31.224:/usr/local/bin

Run on target

root@mylinkit:/# 
root@mylinkit:/# /usr/local/bin/function_key 
MRAA Version: v0.8.0
Starting Read on IO6
Gpio is 0
Gpio is 0
Gpio is 0

Using ipk

Push ipk to target

$ scp bin/ramips/packages/base/function_key_1.0-1_ramips_24kec.ipk root@192.168.31.224:/tmp/

Install ipk and run

root@mylinkit:/# opkg install tmp/function_key_1.0-1_ramips_24kec.ipk 
Installing function_key (1.0-1) to root...
Configuring function_key.
root@mylinkit:/# 
root@mylinkit:/# 
root@mylinkit:/# 
root@mylinkit:/# function_key 
root@mylinkit:/# ls /usr/bin/function_key 
/usr/bin/function_key
root@mylinkit:/# /usr/bin/function_key 
MRAA Version: v0.8.0
Starting Read on IO6
Gpio is 1
Gpio is 1
Gpio is 1
Gpio is 1

https://wiki.openwrt.org/doc/howto/obtain.firmware.sdk

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LinkIt7688.md

LinkIt7688.md

MediaTek LinkIt Smart 7688 with OpenWrt

Flash Layout

Backup Factory Data

Flashing Image

via `tftp`

via `sysupgrade`

via `mtd`

Using SDK

Build

Run and Debug

Using ipk

Files

LinkIt7688.md

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History

LinkIt7688.md

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MediaTek LinkIt Smart 7688 with OpenWrt

Flash Layout

Backup Factory Data

Flashing Image

via tftp

via sysupgrade

via mtd

Using SDK

Build

Run and Debug

Using ipk

via `tftp`

via `sysupgrade`

via `mtd`