projects / J-u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| c609719b WD |
1 | How to configure modem support in U-Boot : |
| 2 | ||
| 3 | 1. Define modem initialization strings: | |
| 4 | --------------------------------------- | |
| 5 | ||
| 6 | The modem initialization strings have following format: | |
| 7 | ||
| 8 | mdm_init1=<AT-command> | |
| 9 | mdm_init2=<AT-command> | |
| 10 | ... | |
| 11 | ||
| 12 | Turning off modem verbose responses with ATV0 or ATQ1 is not allowed; | |
| 13 | U-Boot analyzes only verbose (not numeric) result codes. Modem local | |
| 14 | command echo can be turned off (ATE0). | |
| 15 | ||
| 16 | 2. RTS/CTS hardware flow control: | |
| 17 | --------------------------------- | |
| 18 | ||
| 19 | You may wish to enable RTS/CTS hardware flow control, if the board's | |
| 20 | UART driver supports it (see CONFIG_HWFLOW compile-time flag in | |
| 21 | config/<board>.h). This is controlled by the 'mdm_flow_control' | |
| 22 | environment variable: | |
| 23 | ||
| 24 | 'mdm_flow_control=rts/cts' - to enable RTS/CTS flow control. | |
| 25 | 'mdm_flow_control=none ' - to disable. | |
| 26 | ||
| 27 | ||
| 28 | The following are the examples using a Rockwell OEM modem | |
| 29 | configuration: | |
| 30 | ||
| 31 | SAMSUNG # setenv mdm_init1 ATZ - reset the modem to | |
| 32 | the factory defaults. | |
| 33 | SAMSUNG # setenv mdm_init2 ATS0=1 - set modem into | |
| 34 | answer mode. | |
| 35 | SAMSUNG # setenv mdm_flow_control rts/cts - enable serial port | |
| 36 | flow control | |
| 37 | SAMSUNG # saveenv | |
| 38 | ||
| 39 | The example above initializes modem into answer mode to wait for the | |
| 40 | incoming call. RTS/CTS flow control is enabled for the serial port. | |
| 41 | (The RTS/CTS flow control is enabled by default on the modem). | |
| 42 | ||
| 43 | ||
| 44 | SAMSUNG # setenv mdm_init1 ATZ | |
| 45 | SAMSUNG # setenv mdm_init2 ATS39=0+IFC=0,0 - disable modem | |
| 46 | RTS/CTS flow control | |
| 47 | SAMSUNG # setenv mdm_init3 ATDT1643973 - dial out the number | |
| 48 | SAMSUNG # setenv mdm_flow_control none | |
| 49 | SAMSUNG # saveenv | |
| 50 | ||
| 51 | The example above initializes modem to dial-up connection on the | |
| 52 | number 1643973. Flow control is disabled. | |
| 53 | ||
| 54 | Note that flow control must be turned both off or both on for the | |
| 55 | board serial port and for the modem. | |
| 56 | ||
| 57 | ||
| 58 | If the connection was set up successfully, the U-Boot prompt appears | |
| 59 | on the terminal console. If not (U-Boot modem was configured for | |
| 60 | originating the call and connection was not established) - the board | |
| 61 | should be reset for another dial-up try. | |
| 62 | ||
| 63 | ||
| 64 | Note on the SMDK2400 board: | |
| 65 | --------------------------- | |
| 66 | ||
| 67 | Since the board serial ports does not have DTR signal wired, modem | |
| 68 | should be told to ignore port DTR setting prior to connection to the | |
| 69 | SMDK board, and this setting should be stored in modem NVRAM. For the | |
| 70 | Rockwell OEM modem this can to be done with the following command: | |
| 71 | ||
| 72 | AT&D0&W |