Some videos of the updated codes and hardware. The
hardware consists of an ARM7 microcontroller interfaced to a memory
card (SD FAT32), Bluetooth module and PC via RS-232.

 The code now completely supports SD as well as SDHC cards. vid1 shows
the working of four basic commands implemented on the system viz
ls,cd,cat and ld. ld is a non standard command which reads the hex
file from the memory card and loads in into RAM. The kernel then
transfers the control to the code. The RAM_TEXT.HEX file contains a
code to continuously transmit on the  "It works!" on its UART
interface. That can be seen in the video.

vid2 and vid3 shows the working of BT module. The command "btt" starts
the BT terminal in which all the commands typed on the terminal will
be relayed to the BT module directly. The BT module supports AT
command set. List of supported commands can be seen by entering "AT".
In the video, the module is set in discoverable mode (AT+BDISCMODE)
and it inquires (AT+INQ) about active BT devices. It detects my
cellphone by its BT ID and name. Once discovered, the device should be
paired (AT+BPAIR). After pairing the device is connected (AT+CON) and
data can be transfered directy after this. "q" is pressed to exit the
BT terminal and enter normal prompt again.