Comtrol AT Commands - Manual (Page 41)

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
102184B Conexant 3-15
Table 3-1. Upload Messages
Message Description
Device not supported Displayed if the FLM used does not support the flash memory that
is installed on the board.
Wrong S37 format Displayed if the modem firmware being uploaded is not in Motorola
S3 format.
Record error Displayed if there is an error while either uploading or
downloading. If this occurs, the transfer should be aborted, and the
user should restart at step 5.
Download abort Displayed if the transfer is aborted before it is finished. If this
occurs, the user should restart at step 5.
Erase fail Displayed if the FLM is unable to erase the flash memory. If this
occurs, the user should restart at step 5.
Download error, Re-Load Displayed if there was an error when uploading or downloading. If
this occurs, the user should restart at step 5.
Error, No H/W flow ctl Displayed if RTS-CTS flow control is not set. If this occurs, the
user should restart at step 3.
DTE timeout Displayed if the DTE has stopped the XMODEM transfer process
before it is finished. If this occurs, the user should restart at step 5.
Code doesn’t match
hardware Displayed if the user is attempting to upload a firmware that is not
the same model (parallel, serial, etc.), crystal frequency, or size
(1Mbit, 2Mbit, etc.) as the firmware that is currently on the board. If
this occurs, the FLM will abort and not allow the user to continue.
Device successfully
programmed Displayed by the FLM at the completion of a successful upload or
download then the modem will do a cold start.
The flash load module (FLM) has several built in safety mechanisms to reduce the risk of
a failed flash upload/download. The FLM will not allow a user to upload a firmware of
different model (serial, parallel, etc.) or crystal speed than what is currently in the flash
memory. Also, it will not allow the user to upload a firmware that is larger in size than
the flash memory itself (e.g., a 2Mbit firmware onto a 1Mbit flash memory). It will,
however, allow the user to upload a firmware that is smaller in size than the flash
memory, and it will program the firmware with the appropriate offset in order for the
firmware to function properly. In the instance that there is a failure during the download
or upload process, the modem will be in a “flash rescue mode”. In this mode, the modem
will respond “OK” to all AT commands, but will only take action on the AT** command,
so a new attempt to upload or download can be initiated. When the modem is in the
“flash rescue mode” it will only be able to respond to AT commands if the DTE rate has
not been changed since the last AT** command was successfully issued, even if the
modem is powered off and on.
Uploading NVRAM patch
The NVRAM loader allows NVRAM connected to the modem serial EEPROM bus to be
upgraded with custom patch code. This process transfers the modem patch code from the
host computer to the modem, which transfers the data to the NVRAM device. Uploading
an NVRAM patch to the NVRAM 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 the NVRAM loader into the modem's RAM. The data transfer
is done via an ASCII transfer. The NVRAM loader contains the programming
algorithm for the NVRAM device being programmed.
2. The user will then load the NVRAM patch which the NVRAM loader will then
program into the NVRAM device. This transfer is done via ASCII transfer.