FreeCalypso > hg > freecalypso-sw
view doc/linux-2.6.37.6-ftdi_sio.c.patch @ 992:a7b0b426f9ca
target-utils: boot ROM UART autodetection revamped
The new implementation should work with both the familiar Calypso C035
boot ROM version found in our regular targets as well as the older
Calypso F741979B version found on the vintage D-Sample board.
| author | Mychaela Falconia <falcon@ivan.Harhan.ORG> |
|---|---|
| date | Wed, 30 Dec 2015 21:28:41 +0000 |
| parents | f4da3071dd61 |
| children |
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--- ftdi_sio.c.orig 2011-03-27 11:01:41.000000000 -0800 +++ ftdi_sio.c 2015-10-30 13:18:40.879000032 -0800 @@ -949,7 +949,7 @@ static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 }; __u32 divisor; /* divisor shifted 3 bits to the left */ - int divisor3 = base / 2 / baud; + int divisor3 = (base / 2 + baud / 2) / baud; divisor = divisor3 >> 3; divisor |= (__u32)divfrac[divisor3 & 0x7] << 14; /* Deal with special cases for highest baud rates. */ @@ -1087,6 +1087,17 @@ baud = tty_get_baud_rate(tty); dbg("%s - tty_get_baud_rate reports speed %d", __func__, baud); + /* + * FreeCalypso hack: translate non-std high + * baud rates for GSM like CP2102 does. + */ + if (baud == 230400) + baud = 203125; + else if (baud == 460800) + baud = 406250; + else if (baud == 921600) + baud = 812500; + /* 2. Observe async-compatible custom_divisor hack, update baudrate if needed */