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--- projects:routers:tp-link:tl-wr703n [2015/10/11 15:20] – [Increase flash memory] admin
+++ projects:routers:tp-link:tl-wr703n [2024/09/04 23:12] (current) – [Information and links] admin
@@ Line 152: / Line 152: @@
 ==== Increase flash memory ====
-Before removing the flash memory, first make a backup of the art partition and the u-boot partition. Once done, you can use the following script to build an image for the larger memory.
+Before removing the flash memory, first make a backup of the art partition and the u-boot partition. The art partition holds parameters for your wifi hardware. U-boot partition holds parameters for your Ethernet MAC address and hardware revision number.
+=== Backing up u-boot and art partitions ===
+Logon to your TL-WR703N with ssh and issue following commands:
+  cat /dev/mtd0 > /tmp/mtd0.0x00000000.backup_u-boot.bin
+  cat /dev/mtd4 > /tmp/mtd4.0x003f0000.backup_art.bin
+Then exit and copy the two files to your system with:
+  scp root@IPADDRESS:/tmp/mtd0.0x00000000.backup_u-boot.bin .
+  scp root@IPADDRESS:/tmp/mtd4.0x003f0000.backup_art.bin .
+While you are at it, also download the newest firmware from openwrt and u-boot which has better support for larger memory. See the script from below where to find these files.
+=== Removing the old flash chip ===
+Unsolder the 8-pin flash chip from the back of the board. Remove excessive solder with wick. Then search for your replacement chip:
+  * w25q128 (Which has 16MB instead of 4MB) See [[https://forum.openwrt.org/viewtopic.php?pid=183882#p183882|here]] for other references to this chip.
+=== Creating a flash binary for the new chip ===
+Once done, you can use the following script to build an image for the larger memory.
 <code bash>
 #!/bin/sh
@@ Line 221: / Line 236: @@
 </code>
-Electrically upgrading the flash memory requires to have a compatible chip. I planned to upgrade with this chip:
+=== Flashing with buspirate ===
-  * w25q128 (16MB instead of 4) See [[https://forum.openwrt.org/viewtopic.php?pid=183882#p183882|here]] for other references to this chip.
+Use your [[http://www.flashrom.org/Bus_Pirate|Bus Pirate]]. If the buspirate is accessible on /dev/ttyUSB0, use following command:
-Instead of programming the memory in a running system with the chip (except for R/W pins) connected in parallel, it is recommended to program this chip externally and then solder it onto the board. For this I decided to use a JTAG interface. Many interfaces exist, I have two, an openmoko debug board v3 and a [[http://www.tiaowiki.com/w/TIAO_USB_Multi_Protocol_Adapter_User%27s_Manual|Tiao usb jtag interface]]. Both use a ftdi2232 interface chip, but from a different generation.
-For the system to recognize the interface please read more [[software:linux:jtag|here]]. To actually read from and write to the eeprom, use [[http://flashrom.org/FT2232SPI_Programmer|flashrom]] which depends on libftdi.
-As an alternative to flash via JTAG -and probably easier to handle- is to use your [[http://www.flashrom.org/Bus_Pirate|Bus Pirate]]. If the buspirate is accessible on /dev/ttyUSB0, use following command:
   flashrom -p buspirate_spi:dev=/dev/ttyUSB0,pullups=on,spispeed=1M -w wr703n_image_16MB.bin
 If ttyUSB0 is not correct, find out with following command which device it should be:
   dmesg | grep -A 4 Pirate | grep tty
+=== Flashing with JTAG ===
+If you have no buspirate at hand, you can also flash via JTAG. You can use several different JTAG interfaces with flashrom. I tried it with two, an openmoko debug board v3 and a [[http://www.tiaowiki.com/w/TIAO_USB_Multi_Protocol_Adapter_User%27s_Manual|Tiao usb jtag interface]]. Both use a ftdi2232 interface chip, but from a different generation.
+For the system to recognize the interface please read more [[software:linux:jtag|here]]. To actually write to the eeprom, use [[http://flashrom.org/FT2232SPI_Programmer|flashrom]] which depends on libftdi.
+==== Connecting after flashing ====
+After the chip has been soldered onto the board and powered on, connect with telnet:
+  telnet 192.168.1.1
+Then set a password for root:
+  passwd
+Now it is possible to connect with ssh:
+  ssh root@192.168.1.1
 ===== Network configurations =====
   * [[http://wiki.openwrt.org/doc/recipes/bridgedclient]] Bridged Client
@@ Line 282: / Line 305: @@
 </code>
 ===== Information and links =====
-  * [[http://squonk42.github.com/TL-WR703N/|Complete schematic diagram of the TL-WR703N]] Including circuit board layout
+  * [[https://squonk42.github.io/TL-WR703N/|Complete schematic diagram of the TL-WR703N]] Including circuit board layout
   * [[http://wiki.openwrt.org/toh/tp-link/tl-wr703n]] Main openwrt page about TL-WR703N
   * [[http://wiki.openwrt.org/doc/howto/clientmode]] Explanation with images of different client modes

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