Quote from: ydenys on October 22, 2012, 10:45:06 PM

I want to run a full Bitcoin node (including a whole up-to-date blockchain) from a USB-powered device connected to the router.

Ideally one USB port should be used to run and power the device/s, but it can be two ports.

This far, I had searched and only aware of another (DD-WRT flashable) router with a USB drive or phone/berry device connected to it which is not a solution.

In the DD-WRT solution, you are simply using the USB drive as a storage device. Initiating connections to other nodes, downloading / uploading the blockchain, and verifying that blocks satisfy the hashes are performed by the Broadcom (MIPS) CPU in the router. DD-WRT is simply an OS with many router features that the Broadcom CPUs can understand, similar to how Mac / Windows / Linux are OSes for the Intel / AMD CPUs. Usually, you can take Linux source code and compile with MIPS as the target architecture, then run it in DD-WRT.

Quote from: ydenys on October 22, 2012, 10:45:06 PM

I want to use a proprietary-softwared Technicolor routers, which allow USB devices to be connected as a network storage. If the device I need is using wireless or a LAN port it should be okay as long as it gets all its power from the router (which will be modified to always run in a full power mode).

Simply plugging in a USB storage device with the blockchain on it does nothing. You need the CPU to process commands to and from that blockchain. It sounds like you have two choices: 1. Rewrite the code to reduce memory usage and compile for MIPS, or 2. Have an external CPU like the Raspberry Pi or a phone to do the CPU work.

Here is an elaboration on choice 1 based on my work on rooting and getting apcupsd running on a NAS running busybox:

Root your router, once you get shell access at busybox, you do not have to install DD-WRT but can just use the default OS already loaded
Install Ubuntu somewhere and compile bitcoin for MIPS
Try to run it with your shell access
Make changes in code and recompile to reduce memory usage