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Table of Contents
TP-Link TL-WR841ND v8.4
OpenWRT LEDE
Check-out
mkdir -p /embedded/openwrt/ cd /embedded/openwrt git clone git://github.com/openwrt/openwrt.git openwrt-wr841.git cd /embedded/openwrt/openwrt-wr841.git git checkout v17.01.6
Set up standard feeds
./scripts/feeds update -a
Or, set up feeds for Pickle Microchip PIC ICSP and NFS
cp feeds.conf.default feeds.conf.default.orig echo "src-git openwrtfiles git://github.com/GBert/openwrt-files" >> feeds.conf.default ./scripts/feeds clean ./scripts/feeds update -a ./scripts/feeds install pickle ./scripts/feeds install nfs-utils
Configure a standard build
make menuconfig [Target System = Atheros AR7xxx/AR9xxx] [Target Profile = TP-LINK TL-WR841N/ND] [Exit] [Yes]
Or, configure for Pickle Microchip PIC ICSP and NFS (build I2C support)
make menuconfig [Target System = Atheros AR7xxx/AR9xxx] [Target Profile = TP-LINK TL-WR841N/ND v8] ENABLE: <M> [Kernel modules] [Filesystems] [kmod-fs-nfs] [Kernel modules] [I2C support] [kmod-i2c-core] [Kernel modules] [I2C support] [kmod-i2c-gpio-custom] [Kernel modules] [Other Modules] [kmod-bit-bang-gpio] ENABLE: <*> [Utilities] [Filesystem] [nfs-utils] [Utilities] [pickle] DISABLE: < > [Base system] [dnsmasq] [Base system] [firewall] [Network] [Firewall] [iptables] [Network] [odhcpd] [Network] [ppp] [Kernel modules] [Network Support] [kmod-ppp] [Kernel modules] [Netfilter Extensions] [all] [Kernel modules] [USB Support] [all] [Exit] [Yes]
Build
This can take half an hour.
chown -R nobody /embedded/openwrt/openwrt-wr841.git su nobody -c 'make V=s -j 4'
Inspect
ls -1 bin/targets/ar71xx/generic/*wr841*bin
Install
scp root@192.168.1.1:/tmp/ ssh root@192.168.1.1 sysupgrade -v /tmp/ar71xx/openwrt-ar71xx-generic-tl-wr841n-v8-squashfs-factory.bin
Login
ssh root@192.168.1.1
Re-initialise (optional)
firstboot reboot -f 
NFS
Copy the packages to the router's tmp directory, Eg.
scp bin/ar71xx/packages/base/kmod-dnsresolver_4.1.15-1_ar71xx.ipk root@192.168.1.1:/tmp scp bin/ar71xx/packages/base/kmod-fs-nfs-common_4.1.15-1_ar71xx.ipk root@192.168.1.1:/tmp scp bin/ar71xx/packages/base/kmod-fs-nfs_4.1.15-1_ar71xx.ipk root@192.168.1.1:/tmp
Then, on the router install the packages.
opkg install kmod-dnsresolver_4.1.15-1_ar71xx.ipk opkg install kmod-fs-nfs-common_4.1.15-1_ar71xx.ipk opkg install kmod-fs-nfs_4.1.15-1_ar71xx.ipk
Serial
VDD GND RX TX
GPIO
1 2 GND
GPIO1 3 4 GND
GPIO2 5 6 GND
GPIO3 7 8 GND
GPOP0 9 10 GND
11 12
13 14
Pins 1, 3, 7 and 9 are pulled to ground via 10K resistors.
Pin 11 may have originally been RESET but there is missing link to it's left.
Pickle Microchip PIC ICSP
Bit-bang GPIO (gpio-bb).
insmod gpio-bb && mknod /dev/gpio-bb c 180 0
Pickle configuration.
DEVICE=/dev/gpio-bb BITRULES=0x1000 SLEEP=1 BUSY=0 VPP=2 PGM=1 PGC=3 PGD=0 DEBUG=1
