PCear FM Radio upgrade:

  Instructions on how to upgrade your PCear FM Radio to Silabs
firmware.  NOTE: I've tested these steps pretty well but I make
absolutely no guarantee that you won't turn your radio into a
non-functioning brick.

1. Installl Linux-2.6.26 or later and get radio-si470x.c (in this
archive) and install and boot it.

2. Plug in the PCear and do this command:

lsusb

  You should see something like:

Bus 002 Device 107: ID 10c5:819a Sanei Electric, Inc. 

3. Do as superuser (NOTE: this will step will take about 2 minutes,
   the output file image.bin should increas in size during this
   period):

echo 1 > /sys/class/radio/c8051flash/flash_access
cat /sys/class/radio/c8051flash/flash_raw > image.bin
wget http://www.efn.org/~rick/work/pcear/image.pcear.orig.raw.bin
cmp -l image.pcear.orig.raw.bin image.bin

4. If the last command printed out differences outside the range 13824-13855

  DON'T proceed!  You do not have compatible software and may will
probably turn your radio into a brick if you proceed.

5. Make a radio subdirectory and unzip this archive and go to the
  AN264SW directory.

mkdir ~/radio; cd ~/radio
tar jxf pcear.X.tar.bz2  # where X is the revision
Note that you don't need this file:
usr/local/share/sdcc/include/mcs51/C8051F320.h
unless you want to build the firmware.

6.  Unplug your radio and then plug it back in and do:

cd AN264SW
echo 1 > /sys/class/radio/c8051flash/flash_access
cat pcear.upgrade.pass1.bin > /sys/class/radio/c8051flash/flash_data

7. Unplug your radio and then plug it back in and do:

echo 1 > /sys/class/radio/c8051flash/flash_access
cat pcear.upgrade.pass2.bin > /sys/class/radio/c8051flash/flash_data

8. Unplug your radio and then plug it back in and do:

echo 1 > /sys/class/radio/c8051flash/flash_access
for (( cntr= 0; cntr < 28; cntr++ )); do cat silabs$cntr.fmt.bin > /sys/class/radio/c8051flash/flash_data; done

9.  Unplug your radio and then plug it back in and do this command:

lsusb

  You should see something like:

Bus 002 Device 021: ID 10c4:818a Cygnal Integrated Products, Inc. 

10. To use the radio do just one (only one) of these (take your pick):

gradio &
radio -c /dev/radio0 &
kradio & 
gnomeradio &

AND do just one of these (take your pick):

sox -c 2 -s -r 48000 -t oss /dev/dsp1 -t oss -r 48000 /dev/dsp
sox -2 --endian little -r 96000 -t oss /dev/dsp1 -t oss /dev/dsp
arecord -D hw:1,0 -r96000 -c2 -f S16_LE | artsdsp aplay -B -

11.  To use my changed firmware that fixes pops and clicks.  WARNING:
    No guarantees this won't brick your unit.  Hook up a C2 interface
    if you want to make sure you can recover from it.

# Make sure you exit from sox and your radio program!
killall sox
killall radio
cd AN264SW/Firmware
make upgrade