| wdenk | c609719 | 2002-11-03 00:24:07 +0000 | [diff] [blame] | 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 |
| 73 | |