From e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb Mon Sep 17 00:00:00 2001 From: Yang Zhang Date: Fri, 28 Aug 2015 09:58:54 +0800 Subject: Add qemu 2.4.0 Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang --- qemu/roms/u-boot/doc/README.Modem | 72 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 qemu/roms/u-boot/doc/README.Modem (limited to 'qemu/roms/u-boot/doc/README.Modem') diff --git a/qemu/roms/u-boot/doc/README.Modem b/qemu/roms/u-boot/doc/README.Modem new file mode 100644 index 000000000..1613c11ca --- /dev/null +++ b/qemu/roms/u-boot/doc/README.Modem @@ -0,0 +1,72 @@ +How to configure modem support in U-Boot : + +1. Define modem initialization strings: +--------------------------------------- + +The modem initialization strings have following format: + + mdm_init1= + mdm_init2= + ... + +Turning off modem verbose responses with ATV0 or ATQ1 is not allowed; +U-Boot analyzes only verbose (not numeric) result codes. Modem local +command echo can be turned off (ATE0). + +2. RTS/CTS hardware flow control: +--------------------------------- + +You may wish to enable RTS/CTS hardware flow control, if the board's +UART driver supports it (see CONFIG_HWFLOW compile-time flag in +config/.h). This is controlled by the 'mdm_flow_control' +environment variable: + + 'mdm_flow_control=rts/cts' - to enable RTS/CTS flow control. + 'mdm_flow_control=none ' - to disable. + + +The following are the examples using a Rockwell OEM modem +configuration: + +SAMSUNG # setenv mdm_init1 ATZ - reset the modem to + the factory defaults. +SAMSUNG # setenv mdm_init2 ATS0=1 - set modem into + answer mode. +SAMSUNG # setenv mdm_flow_control rts/cts - enable serial port + flow control +SAMSUNG # saveenv + +The example above initializes modem into answer mode to wait for the +incoming call. RTS/CTS flow control is enabled for the serial port. +(The RTS/CTS flow control is enabled by default on the modem). + + +SAMSUNG # setenv mdm_init1 ATZ +SAMSUNG # setenv mdm_init2 ATS39=0+IFC=0,0 - disable modem + RTS/CTS flow control +SAMSUNG # setenv mdm_init3 ATDT1643973 - dial out the number +SAMSUNG # setenv mdm_flow_control none +SAMSUNG # saveenv + +The example above initializes modem to dial-up connection on the +number 1643973. Flow control is disabled. + +Note that flow control must be turned both off or both on for the +board serial port and for the modem. + + +If the connection was set up successfully, the U-Boot prompt appears +on the terminal console. If not (U-Boot modem was configured for +originating the call and connection was not established) - the board +should be reset for another dial-up try. + + +Note on the SMDK2400 board: +--------------------------- + +Since the board serial ports does not have DTR signal wired, modem +should be told to ignore port DTR setting prior to connection to the +SMDK board, and this setting should be stored in modem NVRAM. For the +Rockwell OEM modem this can to be done with the following command: + +AT&D0&W -- cgit 1.2.3-korg