nothing out to uart,help me

--- Quote Start ---

originally posted by scut_ak@Apr 27 2006, 07:59 PM

there are also a long pause between the message "uncompressing linux..." and "ok, booting the kernel.", about half a minute.

was this ok? my system run at 50mhz(input is 25mhz).

in the menuconfig i only change the

1 device drivers ---> character devices ---> serial drivers --->

disable the jtag uart option and enable uart option

2 processor type and features-->(0x00500000) link address offset for booting

3 processor type and features--> i choose the altera cyclone board

my sdram is at 0x0 and the size is 8mbyte (16bit width)

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=14751)

--- quote end ---

--- Quote End ---

1. you should have

[*] Nios serial support

[*] Support for console on Nios UART

2. boot link offset is correct

3. no need to change, because you are using a custom board.

You are using "tiny core", without icache and dcache. without hw mul.

It is very slow. It takes about 7-10 clocks for each instruction.

You should use "small" or "fast" core, with at least 512Byte icache. dcache is optional.

Hw mul is recommanded.

If you don&#39;t use hw mul, you have to do

1. enable multilib in toolchain option of buildroot menuconfig

2. add "-mno-hw-mul" cflags to busybox menuconfig

3. processor --> Nios II Hardware Multiply Support (None) to kernel config

From your result, the zImage loader is working. and uart direct io is working.

The problem maybe in hw mul .