Thank you very much, Wolfgang.  You are right. We need to modify both
arch/ppc/boot/mbx/m8260_tty.c and rch/ppc/8260_io/uart.c to enable linux
support SMC2 as console for MPC8260. Ppcboot1.0.4 support it, but latest
linux kernel hasn't made SMC2 easy to configuration, although the uart.c
seems already has most code there.

Now I am finished my degree project as porting linux to custom MPC8260 board!
Thank you for your help during this period.

Wang Yonghao

Wolfgang Denk wrote:

In message [ref] you wrote:

quoted

ppcboot as boot loader and kernel 2.4.7. The console is set up on serial

SMC2. I've changed little bit code on arch/ppc/boot/mbx/m8260_tty.c to
enable it supports SMC2. But when I boot kernel,  the console output

Seems you didn't do this right, then.

quoted

seems missing characters like below:

...

quoted

Ttlmmr  2M;uig0Bfrhs al a 0000
Lnxvrin247 wn@ihmr.tlc.k gcvrin30 1FiMr1 53:7GT20
oe0:378pgs:378
oe2:0pgs.
Kre omn ie ot/e/f wnsot121..4:epr/p-f-oti=7.61.1:7.6213121..1:5.5..:iuAM

Well known problem, every second character is missing.

quoted

Does anybody can give me some clue how to fix it?

Make sure to enable SMC1 as serial port, too. If the  console  is  on
SMC2,  _both_ SMC1 and SMC2 must be enabled as a serial ports, or you
have to adjust the uart driver a bit.

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
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