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Christian Vogel vogelchr at vogel.cxHi Bhaskar11, On Tue, 25 Dec 2012 15:35:03 +0100, Bhaskar11 <niceguy108 at gmail.com> wrote: > If the first attempt to switch to 406250 succeeds, the function exits and > never reaches the I_HAVE_A_CP210x code which would switch to a higher > speed! > Is this a bug? Or is the lower speed good enough for burst_ind? In which > case why bother with the I_HAVE_A_CP210x option? that logic is correct. > Or have I missed something obvious? It's not about switching to a slighly higher baudrate of B460800 but rather to switch to the highest baudrate that can sensibly be used on the phone uart which is the non-standard 406250. Some USB/Serial converter chips allow to select almost any baudrate you want out of the box, but CP210x doesn't. If you have a CP210x you modify the eeprom in the serial adapter so that when Linux requests the "Standard" 460k, it actually uses the odd 406k. http://bb.osmocom.org/trac/wiki/Hardware/CP210xTutorial In src/target/firmware/calypso/uart.c there's the uint16_t divider[] table of baudrate dividers, and the two highest speeds supported by the calypso chipset are 406,250 or 812,500 bits per second. Silabs Application note AN205 explains the Silabs side of things. http://www.silabs.com/Support%20Documents/TechnicalDocs/an205.pdf Greetings, Chris