no words output in console on 852t board with kernel 2.6.15

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Hello all,

I try to run  linux 2.6.15  on a 852T custom board but can't see any words 
by console.
I have located the problem with leds and see that the program hangs in 
function dma_alloc_coherent of cpm_uart_allocbuf in file cpm_uart_cpm1.c.


Is there anyone who has already seen similar problem or can give some 
advise?
my kernel configure bases on TQM850L_defconfig and use smc1 as uart .

Thanks
xuyun00

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