Especificação Radio FM USB PCear

Upgrading the PCear FM Radio Using Linux 2.6.26 or newer

The PCear radio, available from dealextreme.com is a low cost version of the Silicon Labs FM Radio but upgrading it is tricky as the bootloader is not separate from the main code. This means you need to install a bootloader in unused code space below 0x3800 that allows you to write above address 0x3800, boot it and use this bootloader to install yet another bootloader up at 0x3800. At this point the bootloader is the same as silabs and the unit can be upgraded normally. Put this archive in a new empty directory and unzip it. Then read Readme.txt The PCear contains the following hardware

• C8051F321 Silicon Labs 8051 CPU see C8051F32x
• Si4701 see Si4702
• C2 pins (2 pin JTAG) see C2spec

fonte:
http://www.efn.org/~rick/work/pcear/