Concurrent Write should never be set. There was a problem with the autoconfig detection in serial.c which left this bit set in uart0 when detecting uart1.
See: http://linux.bkbits.net:8080/linux-2.4/cset at 3f95b003q4gnNPHPXqRMbNkI64jdaA?nav=index.html|src/|src/drivers|src/drivers/char|related/drivers/char/serial.c I've verified this fix with the MPC8540 DUART. Ed.Swarthout at Freescale dot com -----Original Message----- From: DeLaGarza, Robert With regard to "Error No. 26" (quoted below), has any work been done in the kernel or serial drivers to compensate for this error? I've observed problems only when both UARTs were enabled, so I suppose one solution is to enable only one UART. ... http://www.freescale.com/files/32bit/doc/errata/MPC8245CE.pdf ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/