82xx_io UART BRG's vs BUS CLK

[Russell McGuire]

Anyone,

Recently I found that the value I was passing to Linux for the BUS CLK
frequency was incorrect. Previously I was passing in from U-boot (66 * 1000
* 1000) 66Mhz, it had been brought up this can cause incorrect SOF
transmission rates with the 82xx USB driver, so after measuring our 'exact'
clock, I made the adjustment to ( 66,666,666 Hz ) 66.66Mhz .

Hoping this would correct the issue, however now I cannot run the serial
console baud rate (on SMC2) any higher than 115200 without corruption,
however 57600 works on. This worked great before I changed the U-boot BUS
clock to the correct value.

I did some math on the BRG calculations and with 66Mhz the BRG divisor is
17.8 I am assuming 17 gets written, and with 66.666Mhz then its 18.02 so
thus 18 probably gets written. Should perhaps a constant minus 1 be added to
the code?

Using:
U-boot 1.1.2
DENX Linux 2.4.25

Is anyone aware of similar issues, or are there bug fixes past the 2.4.25
Kernel for this?

-Russ