Comtrol AT Command Set Rev A - Manual (Page 40)

AT Commands Reference Manual
Conexant 100722B
3-14
**- Load Flash Memory
The linear flash memory uploader allows flash memory connected to the modem external
memory bus to be upgraded with revised modem firmware. This process transfers
(uploads) the upgraded modem firmware (data) from the host computer to the modem
which transfers the data to the flash memory device. The linear flash memory downloader
allows the flash memory connected to the modem external memory bus to read and
saved. This process transfers (downloads) the current modem firmware (data) to the host
computer. Uploading new firmware to the flash memory or downloading existing
firmware from the flash memory device is a two-step process.
1. When the AT** command is issued, the modem firmware boot loader is invoked and
the user will first load a flash load module (FLM) into the modem's RAM. If the user
wishes to upload new firmware to the modem, he should load the uploader FLM. If
the user wishes to download existing firmware from the modem, he should load the
downloader FLM. In either case, the data transfer is done via an ASCII transfer. The
FLM contains the programming algorithm for the flash memory device being
programmed and any messages that may be sent during the load process.
2. If the user wishes to upload new firmware to the modem, then he will then load the
new modem firmware which the uploader FLM will then program into the flash
memory device. This transfer is done via XMODEM transfer. If the user wishes to
download existing firmware from the modem, then he will set up the host PC for
XMODEM receive and the downloader FLM will begin to send the existing
firmware from the flash memory to the host PC.
Procedure
1. Install in the modem a flash memory programmed with the modem firmware or a
blank flash memory.
2. Put the uploader FLM and downloader FLM files and the new modem firmware file
(e.g., XmUL003.s37, XmDL003.s37, and 206s4712.S37) in an appropriate directory
on the computer's hard disk.
3. Configure the communications application program for a DTE rate of between 9600
bps and 115200 bps and RTS/CTS flow control.
4. Check the modem for response by typing AT.
5. Initiate the download process using the AT** command. The "Download flash
code…" message appears upon issuing the AT** command.
6. Perform an ASCII transfer of the FLM file (e.g., XmUL003.s37 for uploading new
firmware to the modem or XmDL003.s37 for downloading existing firmware from
the modem) from the host computer to the modem RAM using an industry standard
communications software or an equivalent process (ensure that all ASCII translation
or pacing is turned off).
7. After the FLM has been loaded, if uploading new firmware to the modem, perform
an XMODEM upload of the new modem firmware hex file (e.g., 206s4712.S37)
from the host computer to the modem RAM using an industry standard
communications software or an equivalent process. If downloading existing
firmware from the modem, using an industry standard communications software or
equivalent, put the host PC in XMODEM receive mode.