[U-Boot-Users] ppc4xx/serial.c

[Laurent Mohin]

François-Xavier,

You're perfectly right.
What's exactly your problem? 

Give us your cpu_freq value and desired baudrate so that we can help.

Laurent





Seingier François-Xavier <Francois-Xavier.Seingier at thomson.net>
Sent by: u-boot-users-admin at lists.sourceforge.net
12/07/04 18:23

 
        To:     "U-Boot-Users \(E-mail\)" <u-boot-users at lists.sourceforge.net>
        cc: 
        Subject:        [U-Boot-Users] ppc4xx/serial.c


hello,
I've been going through the code of the function serial_init because I 
couldn't get the proper baudrate divisor. I must admit I don't understand 
the operations made to calculate udiv and bdiv... According to the 405gp 
user manual, these are the meanings of a few parameters.

CFG_BASE_BAUD = SerClk / 16

bdiv = SerClk / (16 * baudrate)

SerClk = cpu_freq / udiv



As a result, udiv and bdiv should be generated as follows in serail_init:

if external_clock:

SerClk = CFG_EXT_SERIAL_CLK
udiv = 1

else:

SerClk = CFG_BASE_BAUD * 16
udiv = cpu_freq / serClk

endif

bdiv = SerClk / (16 * baudrate)

Am I missing something?

regards,

François-Xavier SEINGIER


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