Hi all, I found an error in Baud Rate Generator setting for MPC82XX processors.
The CD field of im_brgcx (x = 1..8) register is set to wrong value. This field must be set to divisor lowered by 1, in according with doc for MPC8272 or similar. I have searched 2.4.31 and 2.6.12 kernels. Please check these functions: linux-2.4.31\arch\ppc\boot\simple\m8260_tty.c: serial_init linux-2.4.31\arch\ppc\cpm2_io\commproc.c: cpm2_setbrg linux-2.4.31\arch\ppc\cpm2_io\commproc.c: cpm2_fastbrg linux-2.6.12\arch\ppc\boot\simple\m8260_tty.c: serial_init linux-2.6.12\arch\ppc\syslib\cpm2_common.c: cpm2_setbrg linux-2.6.12\arch\ppc\syslib\cpm2_common.c: cpm2_fastbrg This problem is shown only for small divider - for normal UART baud rates the deviation is slight. (I think that better approach is round the divisor to nearest value). Best regards Petr Borsodi, SW Development S.ICZ a.s., J.S. Baara 40, 370 01 Ceske Budejovice, Czech Republic
