SeeedStudio LinkIt-Smart-7688

SeeedStudio LinkIt-Smart-7688

SeeedStudio Web Page http://www.seeedstudio.com/depot/LinkIt-Smart-7688-p-2573.html

MediaTek Web Page http://labs.mediatek.com/site/global/developer_tools/mediatek_linkit_smart_7688/whatis_7688/index.gsp

Supported Versions

Hardware Highlights

Installation

→ Install OpenWrt (generic explanation)

Please add the installation procedure here.

Hardware

Overview

Architecture	MIPS
Vendor	MediaTek
bootloader	U-Boot 1.1.3
System-On-Chip	MediaTek MT7688 ver:1 eco:2
CPU	MIPS 24KEc
CPU Speed	580 MHz
Flash	32 MB MX25L25735FMI-10G
RAM	128 MB
Wireless	SoC
Ethernet	None
USB	Yes 1x (USB 2.0)
FCC ID	Z4T-LINKITS7688D

Photos

To Do

Factory Bootlog

[04050C0C][04050C0D] DDR Calibration DQS reg = 00008988 U-Boot 1.1.3 (Sep 10 2015 - 05:56:31) Board: Ralink APSoC DRAM: 128 MB relocate_code Pointer at: 87f68000 flash manufacture id: c2, device id 20 19 find flash: MX25L25635E *** Warning - bad CRC, using default environment ============================================ Ralink UBoot Version: 4.3.0.0 -------------------------------------------- ASIC 7628_MP (Port5<->None) DRAM component: 1024 Mbits DDR, width 16 DRAM bus: 16 bit Total memory: 128 MBytes Flash component: SPI Flash Date:Sep 10 2015 Time:05:56:31 ============================================ icache: sets:512, ways:4, linesz:32 ,total:65536 dcache: sets:256, ways:4, linesz:32 ,total:32768 ##### The CPU freq = 580 MHZ #### estimate memory size =128 Mbytes RESET MT7628 PHY!!!!!! GPIOMODE --> 50054404 GPIOMODE2 --> 5540551 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. 7: Load Boot Loader code then write to Flash via Serial. 9: Load Boot Loader code then write to Flash via TFTP. 0 3: System Boot system code via Flash. ## Booting image at bc050000 ... Image Name: MIPS OpenWrt Linux-3.18.21 Image Type: MIPS Linux Kernel Image (lzma compressed) Data Size: 1118491 Bytes = 1.1 MB Load Address: 80000000 Entry Point: 80000000 Verifying Checksum ... OK Uncompressing Kernel Image ... OK No initrd ## Transferring control to Linux (at address 80000000) ... ## Giving linux memsize in MB, 128 Starting kernel ... [ 0.000000] Linux version 3.18.21 (buildbot@builder1) (gcc version 4.8.3 (OpenWrt/Linaro GCC 4.8-2014.04 r47269) ) #5 Fri Nov 20 12:43:14 CET 2015 [ 0.000000] Board has DDR2 [ 0.000000] Analog PMU set to hw control [ 0.000000] Digital PMU set to hw control [ 0.000000] SoC Type: MediaTek MT7688 ver:1 eco:2 [ 0.000000] bootconsole [early0] enabled [ 0.000000] CPU0 revision is: 00019655 (MIPS 24KEc) [ 0.000000] MIPS: machine is MediaTek LinkIt Smart 7688 [ 0.000000] Determined physical RAM map: [ 0.000000] memory: 08000000 @ 00000000 (usable) [ 0.000000] Initrd not found or empty - disabling initrd [ 0.000000] Zone ranges: [ 0.000000] Normal [mem 0x00000000-0x07ffffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x00000000-0x07ffffff] [ 0.000000] Initmem setup node 0 [mem 0x00000000-0x07ffffff] [ 0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes. [ 0.000000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32512 [ 0.000000] Kernel command line: console=ttyS2,57600 rootfstype=squashfs,jffs2 [ 0.000000] PID hash table entries: 512 (order: -1, 2048 bytes) [ 0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes) [ 0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes) [ 0.000000] Writing ErrCtl register=00000413 [ 0.000000] Readback ErrCtl register=00000413 [ 0.000000] Memory: 126332K/131072K available (2703K kernel code, 129K rwdata, 344K rodata, 144K init, 190K bss, 4740K reserved) [ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 [ 0.000000] NR_IRQS:256 [ 0.000000] intc: using register map from devicetree [ 0.000000] CPU Clock: 580MHz [ 0.000000] clocksource_of_init: no matching clocksources found [ 0.000000] Calibrating delay loop... 385.84 BogoMIPS (lpj=1929216) [ 0.060000] pid_max: default: 32768 minimum: 301 [ 0.060000] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.070000] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.080000] pinctrl core: initialized pinctrl subsystem [ 0.090000] NET: Registered protocol family 16 [ 0.110000] mt7621_gpio 10000600.gpio: registering 32 gpios [ 0.120000] mt7621_gpio 10000600.gpio: registering 32 gpios [ 0.130000] mt7621_gpio 10000600.gpio: registering 32 gpios [ 0.140000] Switched to clocksource MIPS [ 0.150000] NET: Registered protocol family 2 [ 0.150000] TCP established hash table entries: 1024 (order: 0, 4096 bytes) [ 0.170000] TCP bind hash table entries: 1024 (order: 0, 4096 bytes) [ 0.180000] TCP: Hash tables configured (established 1024 bind 1024) [ 0.190000] TCP: reno registered [ 0.200000] UDP hash table entries: 256 (order: 0, 4096 bytes) [ 0.210000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes) [ 0.220000] NET: Registered protocol family 1 [ 0.230000] futex hash table entries: 256 (order: -1, 3072 bytes) [ 0.260000] squashfs: version 4.0 (2009/01/31) Phillip Lougher [ 0.280000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc. [ 0.300000] msgmni has been set to 246 [ 0.310000] io scheduler noop registered [ 0.320000] io scheduler deadline registered (default) [ 0.330000] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled [ 0.350000] 10000c00.uartlite: ttyS0 at MMIO 0x10000c00 (irq = 28, base_baud = 2500000) is a 16550A [ 0.360000] 10000d00.uart1: ttyS1 at MMIO 0x10000d00 (irq = 29, base_baud = 2500000) is a 16550A [ 0.380000] console [ttyS2] disabled [ 0.390000] 10000e00.uart2: ttyS2 at MMIO 0x10000e00 (irq = 30, base_baud = 2500000) is a 16550A [ 0.410000] console [ttyS2] enabled [ 0.410000] console [ttyS2] enabled [ 0.420000] bootconsole [early0] disabled [ 0.420000] bootconsole [early0] disabled [ 0.440000] spi-mt7621 10000b00.spi: sys_freq: 193333333 [ 0.450000] m25p80 spi32766.0: mx25l25635e (32768 Kbytes) [ 0.470000] m25p80 spi32766.0: using chunked io [ 0.470000] 4 ofpart partitions found on MTD device spi32766.0 [ 0.490000] Creating 4 MTD partitions on "spi32766.0": [ 0.500000] 0x000000000000-0x000000030000 : "u-boot" [ 0.510000] 0x000000030000-0x000000040000 : "u-boot-env" [ 0.520000] 0x000000040000-0x000000050000 : "factory" [ 0.530000] 0x000000050000-0x000002000000 : "firmware" [ 0.610000] 2 uimage-fw partitions found on MTD device firmware [ 0.620000] 0x000000050000-0x00000016115b : "kernel" [ 0.630000] 0x00000016115b-0x000002000000 : "rootfs" [ 0.640000] mtd: device 5 (rootfs) set to be root filesystem [ 0.650000] 1 squashfs-split partitions found on MTD device rootfs [ 0.660000] 0x000001500000-0x000002000000 : "rootfs_data" [ 0.690000] ralink_soc_eth 10100000.ethernet eth0: ralink at 0xb0100000, irq 5 [ 0.700000] mt7621_wdt 10000120.watchdog: Initialized [ 0.710000] TCP: cubic registered [ 0.720000] NET: Registered protocol family 17 [ 0.730000] bridge: automatic filtering via arp/ip/ip6tables has been deprecated. Update your scripts to load br_netfilter if you need this. [ 0.760000] Bridge firewalling registered [ 0.760000] 8021q: 802.1Q VLAN Support v1.8 [ 0.770000] mtk-linkit bootstrap: Version : LINKITS7688 [ 0.780000] mtk-linkit bootstrap: Revision : REV3 [ 0.790000] mtk-linkit bootstrap: setting up bootstrap latch [ 0.810000] VFS: Mounted root (squashfs filesystem) readonly on device 31:5. [ 0.830000] Freeing unused kernel memory: 144K (8031c000 - 80340000) [ 2.130000] init: Console is alive [ 2.130000] init: - watchdog - [ 4.160000] usbcore: registered new interface driver usbfs [ 4.170000] usbcore: registered new interface driver hub [ 4.180000] usbcore: registered new device driver usb [ 4.200000] exFAT: Version 1.2.9 [ 4.210000] SCSI subsystem initialized [ 4.230000] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 4.240000] ehci-platform: EHCI generic platform driver [ 4.450000] phy phy-usbphy.0: remote usb device wakeup disabled [ 4.460000] phy phy-usbphy.0: UTMI 16bit 30MHz [ 4.470000] ehci-platform 101c0000.ehci: EHCI Host Controller [ 4.480000] ehci-platform 101c0000.ehci: new USB bus registered, assigned bus number 1 [ 4.500000] ehci-platform 101c0000.ehci: irq 26, io mem 0x101c0000 [ 4.530000] ehci-platform 101c0000.ehci: USB 2.0 started, EHCI 1.00 [ 4.540000] hub 1-0:1.0: USB hub found [ 4.550000] hub 1-0:1.0: 1 port detected [ 4.560000] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [ 4.570000] ohci-platform: OHCI generic platform driver [ 4.580000] ohci-platform 101c1000.ohci: Generic Platform OHCI controller [ 4.590000] ohci-platform 101c1000.ohci: new USB bus registered, assigned bus number 2 [ 4.610000] ohci-platform 101c1000.ohci: irq 26, io mem 0x101c1000 [ 4.680000] hub 2-0:1.0: USB hub found [ 4.690000] hub 2-0:1.0: 1 port detected [ 4.700000] platform gpio-leds: Driver leds-gpio requests probe deferral [ 4.720000] MTK MSDC device init. [ 4.770000] mtk-sd: MediaTek MT6575 MSDC Driver [ 4.780000] sdhci: Secure Digital Host Controller Interface driver [ 4.790000] sdhci: Copyright(c) Pierre Ossman [ 4.800000] platform gpio-leds: Driver leds-gpio requests probe deferral [ 4.810000] sdhci-pltfm: SDHCI platform and OF driver helper [ 4.830000] usbcore: registered new interface driver usb-storage [ 5.190000] init: - preinit - [ 6.230000] rt305x-esw 10110000.esw: link changed 0x00 [ 6.430000] random: mktemp urandom read with 9 bits of entropy available Press the [f] key and hit [enter] to enter failsafe mode Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level [ 9.760000] jffs2: notice: (368) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found. [ 9.790000] mount_root: switching to jffs2 overlay [ 9.830000] procd: - early - [ 9.830000] procd: - watchdog - [ 10.640000] procd: - ubus - [ 11.640000] procd: - init - Please press Enter to activate this console. [ 13.460000] NET: Registered protocol family 10 [ 13.550000] ip6_tables: (C) 2000-2006 Netfilter Core Team [ 13.580000] i2c /dev entries driver [ 14.210000] <-- RTMPAllocTxRxRingMemory, Status=0, ErrorValue=0x [ 14.230000] <-- RTMPAllocAdapterBlock, Status=0 [ 14.240000] mtk_gpio_wifi gpio-wifi: registering 1 gpio [ 14.290000] i2c-ralink 10000900.i2c: loaded [ 14.310000] Linux video capture interface: v2.00 [ 14.460000] Enable Ralink GDMA Controller Module [ 14.470000] GDMA IP Version=3 [ 14.510000] ******* mt76xx_pcm_init ******* [ 14.520000] *******Enter codec_wm8960_i2c_probe******** [ 14.530000] soc-audio soc-audio: ASoC: machine MTK APSoC I2S should use snd_soc_register_card() [ 14.550000] wm8960 0-001a: No platform data supplied [ 15.060000] soc-audio soc-audio: wm8960-hifi <-> mt76xx-i2s mapping ok [ 15.080000] ip_tables: (C) 2000-2006 Netfilter Core Team [ 15.110000] nf_conntrack version 0.5.0 (1976 buckets, 7904 max) [ 15.140000] usbcore: registered new interface driver uvcvideo [ 15.160000] USB Video Class driver (1.1.1) [ 15.180000] xt_time: kernel timezone is -0000 [ 15.200000] PPP generic driver version 2.4.2 [ 15.210000] NET: Registered protocol family 24 [ 21.130000] device eth0 entered promiscuous mode [ 21.150000] br-lan: port 1(eth0) entered forwarding state [ 21.160000] br-lan: port 1(eth0) entered forwarding state [ 22.390000] efuse_probe: efuse = 10000012 [ 22.570000] tssi_0_target_pwr_g_band = 26 [ 22.580000] tssi_1_target_pwr_g_band = 35 [ 23.160000] br-lan: port 1(eth0) entered forwarding state [ 28.690000] <==== rt28xx_init, Status=0 [ 29.710000] device ra0 entered promiscuous mode [ 29.720000] br-lan: port 2(ra0) entered forwarding state [ 29.730000] br-lan: port 2(ra0) entered forwarding state [ 31.730000] br-lan: port 2(ra0) entered forwarding state [ 66.280000] random: nonblocking pool is initialized BusyBox v1.23.2 (2015-11-18 16:34:33 CET) built-in shell (ash) _______ ________ __ | |.-----.-----.-----.| | | |.----.| |_ | - || _ | -__| || | | || _|| _| |_______|| __|_____|__|__||________||__| |____| |__| W I R E L E S S F R E E D O M ----------------------------------------------------- CHAOS CALMER (15.05+linkit, r47501) ----------------------------------------------------- * 1 1/2 oz Gin Shake with a glassful * 1/4 oz Triple Sec of broken ice and pour * 3/4 oz Lime Juice unstrained into a goblet. * 1 1/2 oz Orange Juice * 1 tsp. Grenadine Syrup ----------------------------------------------------- root@mylinkit:/#

USB Recovery

Simple firmware recovery via Das U-Boot.

Place the Factory Firmware named lks7688.img on a USB Stick.

Use the UART Console and *Hidden* Option 5

There are other hidden options available, read https://forum.openwrt.org/t/ai7688-update-issue/128369/26

[04050C0D][04050C0D] DDR Calibration DQS reg = 00008989 U-Boot 1.1.3 (Sep 10 2015 - 05:56:31) Board: Ralink APSoC DRAM: 128 MB relocate_code Pointer at: 87f68000 flash manufacture id: c2, device id 20 19 find flash: MX25L25635E ============================================ Ralink UBoot Version: 4.3.0.0 -------------------------------------------- ASIC 7628_MP (Port5<->None) DRAM component: 1024 Mbits DDR, width 16 DRAM bus: 16 bit Total memory: 128 MBytes Flash component: SPI Flash Date:Sep 10 2015 Time:05:56:31 ============================================ icache: sets:512, ways:4, linesz:32 ,total:65536 dcache: sets:256, ways:4, linesz:32 ,total:32768 ##### The CPU freq = 580 MHZ #### estimate memory size =128 Mbytes RESET MT7628 PHY!!!!!! GPIOMODE --> 50054404 GPIOMODE2 --> 5540551 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. 7: Load Boot Loader code then write to Flash via Serial. 9: Load Boot Loader code then write to Flash via TFTP. You choosed 5 0 5: System Load Linux then write to Flash via USB Storage. (Re)start USB... USB0: *********ehci_hcd_init********** Mediatek/Ralink USB EHCI host init hccr b01c0000 and hcor b01c0010 hc_length 16 6. u2phydcr0(0xb0120860)=0x00aaaa02 FM_OUT value: u4FmOut = 0(0x00000000) FM_OUT value: u4FmOut = 133(0x00000085) FM detection done! loop = 1 SR calibration value u1SrCalVal = 6 Register 1111 NbrPorts 1 USB EHCI 1.00 scanning bus 0 for devices... 2 USB Device(s) found scanning bus for storage devices... 1 Storage Device(s) found reading lks7688.img ........................................................................................................................................................................................................................................................................... ....................................................................................................................... 21757956 bytes read writing lks7688.img to flash ............................................................................................................................................................................................................................................................................................................................................ ............................................................................................................................................................................................................................................................................................................................................ . . Done! [04050C0C][04050C0D] DDR Calibration DQS reg = 00008988 U-Boot 1.1.3 (Sep 10 2015 - 05:56:31) Board: Ralink APSoC DRAM: 128 MB relocate_code Pointer at: 87f68000 ****************************** Software System Reset Occurred ****************************** flash manufacture id: c2, device id 20 19 find flash: MX25L25635E ============================================ Ralink UBoot Version: 4.3.0.0 -------------------------------------------- ASIC 7628_MP (Port5<->None) DRAM component: 1024 Mbits DDR, width 16 DRAM bus: 16 bit Total memory: 128 MBytes Flash component: SPI Flash Date:Sep 10 2015 Time:05:56:31 ============================================ icache: sets:512, ways:4, linesz:32 ,total:65536 dcache: sets:256, ways:4, linesz:32 ,total:32768 ##### The CPU freq = 580 MHZ #### estimate memory size =128 Mbytes RESET MT7628 PHY!!!!!! GPIOMODE --> 50054404 GPIOMODE2 --> 5540551 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. 7: Load Boot Loader code then write to Flash via Serial. 9: Load Boot Loader code then write to Flash via TFTP. 2 1 0 3: System Boot system code via Flash. ## Booting image at bc050000 ... Image Name: MIPS OpenWrt Linux-3.18.21 Image Type: MIPS Linux Kernel Image (lzma compressed) Data Size: 1118491 Bytes = 1.1 MB Load Address: 80000000 Entry Point: 80000000 Verifying Checksum ... OK Uncompressing Kernel Image ... OK No initrd ## Transferring control to Linux (at address 80000000) ... ## Giving linux memsize in MB, 128 Starting kernel ... [ 0.000000] Linux version 3.18.21 (buildbot@builder1) (gcc version 4.8.3 (OpenWrt/Linaro GCC 4.8-2014.04 r47269) ) #5 Fri Nov 20 12:43:14 CET 2015 [ 0.000000] Board has DDR2 [ 0.000000] Analog PMU set to hw control [ 0.000000] Digital PMU set to hw control [ 0.000000] SoC Type: MediaTek MT7688 ver:1 eco:2 [ 0.000000] bootconsole [early0] enabled [ 0.000000] CPU0 revision is: 00019655 (MIPS 24KEc) [ 0.000000] MIPS: machine is MediaTek LinkIt Smart 7688 [ 0.000000] Determined physical RAM map: [ 0.000000] memory: 08000000 @ 00000000 (usable) [ 0.000000] Initrd not found or empty - disabling initrd [ 0.000000] Zone ranges: [ 0.000000] Normal [mem 0x00000000-0x07ffffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x00000000-0x07ffffff] [ 0.000000] Initmem setup node 0 [mem 0x00000000-0x07ffffff] [ 0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes. [ 0.000000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32512 [ 0.000000] Kernel command line: console=ttyS2,57600 rootfstype=squashfs,jffs2 [ 0.000000] PID hash table entries: 512 (order: -1, 2048 bytes) [ 0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes) [ 0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes) [ 0.000000] Writing ErrCtl register=00002410 [ 0.000000] Readback ErrCtl register=00002410 [ 0.000000] Memory: 126332K/131072K available (2703K kernel code, 129K rwdata, 344K rodata, 144K init, 190K bss, 4740K reserved) [ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 [ 0.000000] NR_IRQS:256 [ 0.000000] intc: using register map from devicetree [ 0.000000] CPU Clock: 580MHz [ 0.000000] clocksource_of_init: no matching clocksources found [ 0.000000] Calibrating delay loop... 385.84 BogoMIPS (lpj=1929216) [ 0.060000] pid_max: default: 32768 minimum: 301 [ 0.060000] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.070000] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.080000] pinctrl core: initialized pinctrl subsystem [ 0.090000] NET: Registered protocol family 16 [ 0.110000] mt7621_gpio 10000600.gpio: registering 32 gpios [ 0.120000] mt7621_gpio 10000600.gpio: registering 32 gpios [ 0.130000] mt7621_gpio 10000600.gpio: registering 32 gpios [ 0.140000] Switched to clocksource MIPS [ 0.150000] NET: Registered protocol family 2 [ 0.150000] TCP established hash table entries: 1024 (order: 0, 4096 bytes) [ 0.170000] TCP bind hash table entries: 1024 (order: 0, 4096 bytes) [ 0.180000] TCP: Hash tables configured (established 1024 bind 1024) [ 0.190000] TCP: reno registered [ 0.200000] UDP hash table entries: 256 (order: 0, 4096 bytes) [ 0.210000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes) [ 0.220000] NET: Registered protocol family 1 [ 0.230000] futex hash table entries: 256 (order: -1, 3072 bytes) [ 0.260000] squashfs: version 4.0 (2009/01/31) Phillip Lougher [ 0.280000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc. [ 0.300000] msgmni has been set to 246 [ 0.310000] io scheduler noop registered [ 0.320000] io scheduler deadline registered (default) [ 0.330000] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled [ 0.350000] 10000c00.uartlite: ttyS0 at MMIO 0x10000c00 (irq = 28, base_baud = 2500000) is a 16550A [ 0.360000] 10000d00.uart1: ttyS1 at MMIO 0x10000d00 (irq = 29, base_baud = 2500000) is a 16550A [ 0.380000] console [ttyS2] disabled [ 0.390000] 10000e00.uart2: ttyS2 at MMIO 0x10000e00 (irq = 30, base_baud = 2500000) is a 16550A [ 0.410000] console [ttyS2] enabled [ 0.410000] console [ttyS2] enabled [ 0.420000] bootconsole [early0] disabled [ 0.420000] bootconsole [early0] disabled [ 0.440000] spi-mt7621 10000b00.spi: sys_freq: 193333333 [ 0.450000] m25p80 spi32766.0: mx25l25635e (32768 Kbytes) [ 0.470000] m25p80 spi32766.0: using chunked io [ 0.470000] 4 ofpart partitions found on MTD device spi32766.0 [ 0.490000] Creating 4 MTD partitions on "spi32766.0": [ 0.500000] 0x000000000000-0x000000030000 : "u-boot" [ 0.510000] 0x000000030000-0x000000040000 : "u-boot-env" [ 0.520000] 0x000000040000-0x000000050000 : "factory" [ 0.530000] 0x000000050000-0x000002000000 : "firmware" [ 0.600000] 2 uimage-fw partitions found on MTD device firmware [ 0.610000] 0x000000050000-0x00000016115b : "kernel" [ 0.630000] 0x00000016115b-0x000002000000 : "rootfs" [ 0.640000] mtd: device 5 (rootfs) set to be root filesystem [ 0.650000] 1 squashfs-split partitions found on MTD device rootfs [ 0.660000] 0x000001500000-0x000002000000 : "rootfs_data" [ 0.680000] ralink_soc_eth 10100000.ethernet eth0: ralink at 0xb0100000, irq 5 [ 0.700000] mt7621_wdt 10000120.watchdog: Initialized [ 0.710000] TCP: cubic registered [ 0.720000] NET: Registered protocol family 17 [ 0.730000] bridge: automatic filtering via arp/ip/ip6tables has been deprecated. Update your scripts to load br_netfilter if you need this. [ 0.750000] Bridge firewalling registered [ 0.760000] 8021q: 802.1Q VLAN Support v1.8 [ 0.770000] mtk-linkit bootstrap: Version : LINKITS7688 [ 0.780000] mtk-linkit bootstrap: Revision : REV3 [ 0.790000] mtk-linkit bootstrap: setting up bootstrap latch [ 0.810000] VFS: Mounted root (squashfs filesystem) readonly on device 31:5. [ 0.820000] Freeing unused kernel memory: 144K (8031c000 - 80340000) [ 2.130000] init: Console is alive [ 2.130000] init: - watchdog - [ 4.160000] usbcore: registered new interface driver usbfs [ 4.170000] usbcore: registered new interface driver hub [ 4.180000] usbcore: registered new device driver usb [ 4.200000] exFAT: Version 1.2.9 [ 4.210000] SCSI subsystem initialized [ 4.230000] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 4.240000] ehci-platform: EHCI generic platform driver [ 4.450000] phy phy-usbphy.0: remote usb device wakeup disabled [ 4.460000] phy phy-usbphy.0: UTMI 16bit 30MHz [ 4.470000] ehci-platform 101c0000.ehci: EHCI Host Controller [ 4.480000] ehci-platform 101c0000.ehci: new USB bus registered, assigned bus number 1 [ 4.500000] ehci-platform 101c0000.ehci: irq 26, io mem 0x101c0000 [ 4.530000] ehci-platform 101c0000.ehci: USB 2.0 started, EHCI 1.00 [ 4.540000] hub 1-0:1.0: USB hub found [ 4.550000] hub 1-0:1.0: 1 port detected [ 4.560000] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [ 4.570000] ohci-platform: OHCI generic platform driver [ 4.580000] ohci-platform 101c1000.ohci: Generic Platform OHCI controller [ 4.590000] ohci-platform 101c1000.ohci: new USB bus registered, assigned bus number 2 [ 4.610000] ohci-platform 101c1000.ohci: irq 26, io mem 0x101c1000 [ 4.680000] hub 2-0:1.0: USB hub found [ 4.690000] hub 2-0:1.0: 1 port detected [ 4.700000] platform gpio-leds: Driver leds-gpio requests probe deferral [ 4.720000] MTK MSDC device init. [ 4.770000] mtk-sd: MediaTek MT6575 MSDC Driver [ 4.780000] sdhci: Secure Digital Host Controller Interface driver [ 4.790000] sdhci: Copyright(c) Pierre Ossman [ 4.800000] platform gpio-leds: Driver leds-gpio requests probe deferral [ 4.810000] sdhci-pltfm: SDHCI platform and OF driver helper [ 4.830000] usbcore: registered new interface driver usb-storage [ 5.090000] usb 2-1: new full-speed USB device number 2 using ohci-platform [ 5.190000] init: - preinit - [ 5.790000] usb 2-1: not running at top speed; connect to a high speed hub [ 5.820000] random: procd urandom read with 9 bits of entropy available [ 5.840000] usb-storage 2-1:1.0: USB Mass Storage device detected [ 5.850000] scsi host0: usb-storage 2-1:1.0 [ 5.860000] platform gpio-leds: Driver leds-gpio requests probe deferral [ 6.300000] rt305x-esw 10110000.esw: link changed 0x00 Press the [f] key and hit [enter] to enter failsafe mode Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level [ 6.860000] scsi 0:0:0:0: Direct-Access Generic Flash Disk 8.07 PQ: 0 ANSI: 2 [ 6.880000] platform gpio-leds: Driver leds-gpio requests probe deferral [ 6.910000] sd 0:0:0:0: [sda] 8226816 512-byte logical blocks: (4.21 GB/3.92 GiB) [ 6.930000] sd 0:0:0:0: [sda] Write Protect is off [ 6.940000] sd 0:0:0:0: [sda] No Caching mode page found [ 6.950000] sd 0:0:0:0: [sda] Assuming drive cache: write through [ 7.050000] sda: sda1 [ 7.080000] sd 0:0:0:0: [sda] Attached SCSI removable disk [ 9.650000] mount_root: jffs2 not ready yet, using temporary tmpfs overlay [ 9.690000] procd: - early - [ 9.690000] procd: - watchdog - [ 10.540000] procd: - ubus - [ 11.550000] procd: - init - Please press Enter to activate this console. [ 13.380000] NET: Registered protocol family 10 [ 13.470000] ip6_tables: (C) 2000-2006 Netfilter Core Team [ 13.490000] i2c /dev entries driver [ 14.130000] <-- RTMPAllocTxRxRingMemory, Status=0, ErrorValue=0x [ 14.140000] <-- RTMPAllocAdapterBlock, Status=0 [ 14.150000] mtk_gpio_wifi gpio-wifi: registering 1 gpio [ 14.190000] i2c-ralink 10000900.i2c: loaded [ 14.210000] Linux video capture interface: v2.00 [ 14.250000] Enable Ralink GDMA Controller Module [ 14.260000] GDMA IP Version=3 [ 14.410000] ******* mt76xx_pcm_init ******* [ 14.420000] *******Enter codec_wm8960_i2c_probe******** [ 14.430000] soc-audio soc-audio: ASoC: machine MTK APSoC I2S should use snd_soc_register_card() [ 14.450000] wm8960 0-001a: No platform data supplied [ 14.960000] soc-audio soc-audio: wm8960-hifi <-> mt76xx-i2s mapping ok [ 15.110000] ip_tables: (C) 2000-2006 Netfilter Core Team [ 15.140000] nf_conntrack version 0.5.0 (1976 buckets, 7904 max) [ 15.180000] usbcore: registered new interface driver uvcvideo [ 15.190000] USB Video Class driver (1.1.1) [ 15.210000] xt_time: kernel timezone is -0000 [ 15.240000] PPP generic driver version 2.4.2 [ 15.250000] NET: Registered protocol family 24 [ 23.980000] device eth0 entered promiscuous mode [ 24.020000] br-lan: port 1(eth0) entered forwarding state [ 24.030000] br-lan: port 1(eth0) entered forwarding state [ 25.400000] efuse_probe: efuse = 10000012 [ 25.410000] net ra0: Direct firmware load for mt7628.eeprom failed with error -2 [ 25.420000] net ra0: Falling back to user helper [ 26.030000] br-lan: port 1(eth0) entered forwarding state [ 26.130000] tssi_0_target_pwr_g_band = 26 [ 26.140000] tssi_1_target_pwr_g_band = 35 [ 32.120000] <==== rt28xx_init, Status=0 [ 33.110000] device ra0 entered promiscuous mode [ 33.120000] br-lan: port 2(ra0) entered forwarding state [ 33.130000] br-lan: port 2(ra0) entered forwarding state [ 33.520000] jffs2_scan_eraseblock(): End of filesystem marker found at 0x0 [ 33.530000] jffs2_build_filesystem(): unlocking the mtd device... done. [ 33.550000] jffs2_build_filesystem(): erasing all blocks after the end marker... [ 35.130000] br-lan: port 2(ra0) entered forwarding state [ 56.480000] random: nonblocking pool is initialized [ 88.310000] done. [ 88.320000] jffs2: notice: (1607) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found. BusyBox v1.23.2 (2015-11-18 16:34:33 CET) built-in shell (ash) _______ ________ __ | |.-----.-----.-----.| | | |.----.| |_ | - || _ | -__| || | | || _|| _| |_______|| __|_____|__|__||________||__| |____| |__| W I R E L E S S F R E E D O M ----------------------------------------------------- CHAOS CALMER (15.05+linkit, r47501) ----------------------------------------------------- * 1 1/2 oz Gin Shake with a glassful * 1/4 oz Triple Sec of broken ice and pour * 3/4 oz Lime Juice unstrained into a goblet. * 1 1/2 oz Orange Juice * 1 tsp. Grenadine Syrup ----------------------------------------------------- root@mylinkit:/#

UART / Serial Console

In order to have a usable Console.
I installed a 470K resistor in the UART RX2 line. (P9)
However any value between 220K to 680K is likely to work.

SeeedStudio Breakout for LinkIt Smart 7688 v2.0

SeeedStudio Product Page https://www.seeedstudio.com/Breakout-for-LinkIt-Smart-7688-v2-0-p-2641.html

Breakout for LinkIt Smart 7688 v2.0, succeeding the first version , now can better support the audio recording function. As it reserves the original pins of LinkIt Smart 7688, the board also integrates several frequently-used ports such as an Ethernet port, a 3.5mm audio port, and a Host port (USB Type-A Connector) for more peripherals, and along with 3 Grove ports to provide 2 UART and 1 I2C interfaces for the Grove-based electronics, it saves you a lot of work doing wirings in your smart IoT projects, makes your rapid prototyping even faster.

Features

3.5mm headphone Jack(with Mic) which support OMTP and CTIA
1 x Ethernet to connect internet
1 x USB 2.0 for more peripherals
Grove interface: 2 x UART, 1 x I2C
Stereo and AUX are supported
Audio Recording supported
1W output for each stereo port

SeeedStudio Wiki Page https://wiki.seeedstudio.com/Breakout_for_LinkIt_Smart_7688_v2.0/

Technical details Dimensions: 5.6mm x 8.2mm x 12mm Weight: 49g Battery: Exclude Input voltage: 5.0V(With USB Power port) Operating voltage: 3.3V Max Operating current: 2mA Min Operating current: 800mA Chip: WM8960 Analog pin input voltage(on WM8960 ):2.7~3.6V(Analog pin input voltage on WM8960 for stereo can reach 5.5V at Max.) Digital pin input voltage(on WM8960 ): 1.71~3.6V

some Build changes are needed to use Audio

We add i2s as audio i/o and define i2c to control the audio chip so a volume and other controls is present afterwards.

This is a `git patch` file so copy that to a file in the /openwrt bildroot folder and execute it with `patch -p1 < {filename}` or `git am {filename}.

diff --git a/target/linux/ramips/dts/LINKIT7688.dts b/target/linux/ramips/dts/LINKIT7688.dts
index 7106c3b33a..31dc220571 100644
--- a/target/linux/ramips/dts/LINKIT7688.dts
+++ b/target/linux/ramips/dts/LINKIT7688.dts
@@ -54,6 +54,28 @@
 			linux,code = <KEY_WPS_BUTTON>;
 		};
 	};
+
+       sound {
+               compatible = "simple-audio-card";
+               simple-audio-card,name = "Audio-I2S";
+               simple-audio-card,format = "i2s";
+               simple-audio-card,bitclock-master = <&dailink0_master>;
+               simple-audio-card,frame-master = <&dailink0_master>;
+               simple-audio-card,widgets =
+                       "Headphone", "Headphones";
+               simple-audio-card,routing =
+                       "Headphones", "HP_L",
+                       "Headphones", "HP_R";
+               simple-audio-card,mclk-fs = <256>;
+
+               simple-audio-card,cpu {
+                       sound-dai = <&i2s>;
+               };
+
+               dailink0_master: simple-audio-card,codec {
+                       sound-dai = <&codec>;
+               };
+       };
 };
 
 &pinctrl {
@@ -68,11 +90,6 @@
 			ralink,function = "gpio";
 		};
 
-		i2s {
-			ralink,group = "i2s";
-			ralink,function = "gpio";
-		};
-
 		spis {
 			ralink,group = "spis";
 			ralink,function = "gpio";
@@ -142,6 +159,23 @@
 
 &i2c {
 	status = "okay";
+
+       codec: wm8960@1a {
+               #sound-dai-cells = <0>;
+               compatible = "wlf,wm8960";
+               reg = <0x1a>;
+
+               wlf,shared-lrclk;
+       };
+};
+
+&gdma { status = "okay"; };
+
+&i2s {
+	#sound-dai-cells = <0>;
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2s_pins>;
 };
 
 &uart1 {
diff --git a/target/linux/ramips/image/mt76x8.mk b/target/linux/ramips/image/mt76x8.mk
index d0c66a0e23..b2fd2b7675 100644
--- a/target/linux/ramips/image/mt76x8.mk
+++ b/target/linux/ramips/image/mt76x8.mk
@@ -98,7 +98,7 @@ define Device/LinkIt7688
   IMAGE_SIZE := $(ralink_default_fw_size_32M)
   SUPPORTED_DEVICES := linkits7688 linkits7688d
   DEVICE_TITLE := MediaTek LinkIt Smart 7688
-  DEVICE_PACKAGES:= kmod-usb2 kmod-usb-ohci uboot-envtools
+  DEVICE_PACKAGES:= kmod-usb2 kmod-usb-ohci uboot-envtools kmod-sound-mt7620
 endef
 TARGET_DEVICES += LinkIt7688

Build go to your buildpath and type

make menuconfig

and select sound/alsa-utils as well as the alsa-utils-tests, save and build. After flashing the image you can use

alsamixer

with key “m”, “left-” and “right arrow” keys of your keyboard to navigate through the awesome software mixer of alsa where you have to set: Be careful! High volumes can damage your ears.

Headphone (if you use external Amplifier or headphone via 3.5mm jack outlet) = choose volume
Speaker (About -10dB is a good test volume) = choose volume
Speaker AC = 0
Speaker DC = 0
Left Mixer Output PCM = unmute
Right Mixer Output PCM = unmute

Then try to play with alsa-utils-test like this in the terminal of the device:

speaker-test -t wav -c 2

You then should hear a woman speaking “Left”, “Right” ongoing until you abort with CTRL-c.

If you want to mix an external signal over the aux input try to higher the input 2 volumes in $alsamixer. (untested)

Try playing a .wav file with:

aplay <path/filename.wav>

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